561 lines
23 KiB
C++
561 lines
23 KiB
C++
// © 2024 Long Ly. All rights reserved. Any unauthorized use, reproduction, or distribution of this trademark is strictly prohibited and may result in legal action.
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#include "Libraries/OLSLocomotionBPLibrary.h"
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#include "SequencePlayerLibrary.h"
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#include "Animation/AnimCurveCompressionCodec_UniformIndexable.h"
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#include "Animation/AnimNode_SequencePlayer.h"
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#include "AnimNodes/AnimNode_SequenceEvaluator.h"
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DEFINE_LOG_CATEGORY_STATIC(LogOLSLocomotionLibrary, Verbose, All);
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float UOLSLocomotionBPLibrary::FindPivotTime(const UAnimSequenceBase* animSequence, const float sampleRate)
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{
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if (animSequence)
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{
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const float animLength = animSequence->GetPlayLength(); // Get the total duration of the animation sequence.
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const float sampleDeltaTime = 1 / sampleRate; // Calculate the time interval between each sample based on the sample rate.
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float currentAnimTime = 0.f; // Initialize the current animation time.
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float lastTime = 0.f; // Store the last sampled time.
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float nextTime = currentAnimTime + sampleDeltaTime; // Calculate the next time point for sampling.
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// Extract and normalize the initial root motion translation vector.
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FVector currentLocation = animSequence->ExtractRootMotionFromRange(currentAnimTime, nextTime)
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.GetTranslation().GetSafeNormal2D();
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while (nextTime < animLength) // Loop through the animation until the end.
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{
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// Extract the current rotation based on the root motion from the start to the current time.
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const FRotator currentRotation = animSequence->ExtractRootMotionFromRange(0.0f, currentAnimTime)
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.GetRotation().Rotator();
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// Apply the current rotation to the translation vector and normalize.
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const FVector lastLocation = currentRotation.RotateVector(
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animSequence->ExtractRootMotionFromRange(currentAnimTime, nextTime)
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.GetTranslation().GetSafeNormal2D());
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// Detect a pivot point if the dot product is negative (indicating a direction change).
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if ((currentLocation.Dot(lastLocation) < 0 && currentLocation.SquaredLength() > 0) ||
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(FMath::IsNearlyZero(lastLocation.SquaredLength()) && currentLocation.SquaredLength() > 0))
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{
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return currentAnimTime; // Return the detected pivot time.
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}
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// Handle the case where the current location length is nearly zero.
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if (FMath::IsNearlyZero(currentLocation.Length()))
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{
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currentLocation = lastLocation; // Update the current location for the next iteration.
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}
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// Advance to the next sample time, clamping to ensure it doesn't exceed the animation length.
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lastTime = FMath::Clamp(lastTime + sampleDeltaTime, 0.0f, animLength);
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currentAnimTime = FMath::Clamp(currentAnimTime + sampleDeltaTime, 0.0f, animLength);
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nextTime = FMath::Clamp(nextTime + sampleDeltaTime, 0.0f, animLength);
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}
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}
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return 0.f; // Return 0 if no pivot is detected or if the input animation sequence is invalid.
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}
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float UOLSLocomotionBPLibrary::GetCurveValueAtTime(const UAnimSequenceBase* animSequence,
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const float time,
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const FName& curveName)
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{
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// Initialize buffer access for the specified curve in the given animation sequence.
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FAnimCurveBufferAccess bufferCurveAccess(animSequence, curveName);
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// Validate that the curve data is accessible.
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if (bufferCurveAccess.IsValid())
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{
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// Clamp the time to ensure it's within the valid range of the animation length.
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const float clampedTime = FMath::Clamp(time, 0.f, animSequence->GetPlayLength());
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// Ensure the animation has at least 3 sampled keys for evaluation (2 keys are needed for interpolation).
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if (animSequence->GetNumberOfSampledKeys() > 2)
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{
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// Evaluate the curve data at the specified time and return the result.
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return animSequence->EvaluateCurveData(curveName, clampedTime);
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}
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}
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// Return 0 if the curve is invalid or the animation has insufficient sampled keys.
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return 0.f;
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}
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float UOLSLocomotionBPLibrary::GetTimeAtCurveValue(const UAnimSequenceBase* animSequence,
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const float& curveValue, FName curveName)
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{
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// Initialize buffer access for the specified curve in the given animation sequence.
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FAnimCurveBufferAccess bufferCurveAccess(animSequence, curveName);
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// Validate the curve data.
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if (bufferCurveAccess.IsValid())
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{
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const int32 numKeys = bufferCurveAccess.GetNumSamples(); // Retrieve the total number of keyframes/samples.
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// Ensure there are at least two keyframes for interpolation.
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if (numKeys < 2)
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{
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return 0.f; // Return 0 if not enough data points.
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}
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// Initialize binary search variables.
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int32 first = 1; // Start at the second keyframe.
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int32 last = numKeys - 1; // Index of the last keyframe.
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int32 count = last - first; // Number of keyframes to search through.
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// Perform a binary search to locate the interval containing the curve value.
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while (count > 0)
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{
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int32 step = count / 2; // Calculate the midpoint step.
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int32 middle = first + step; // Determine the middle keyframe.
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// Adjust the search range based on the target curve value.
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if (curveValue > bufferCurveAccess.GetValue(middle))
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{
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first = middle + 1; // Move the search to the right half.
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count -= step + 1; // Update the remaining count.
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}
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else
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{
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count = step; // Narrow the search to the left half.
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}
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}
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// Retrieve values at the keyframes surrounding the target value.
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const float keyAValue = bufferCurveAccess.GetValue(first - 1);
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const float keyBValue = bufferCurveAccess.GetValue(first);
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const float diff = keyBValue - keyAValue; // Calculate the difference between the values.
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// Calculate the interpolation factor (alpha) based on the target value.
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const float alpha = !FMath::IsNearlyZero(diff) ? ((curveValue - keyAValue) / diff) : 0.f;
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// Retrieve the corresponding times for the surrounding keyframes.
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const float keyATime = bufferCurveAccess.GetTime(first - 1);
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const float keyBTime = bufferCurveAccess.GetTime(first);
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// Linearly interpolate between the keyframe times to estimate the target time.
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return FMath::Lerp(keyATime, keyBTime, alpha);
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}
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return 0.f; // Return 0 if the curve is invalid or the target value is not found.
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}
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float UOLSLocomotionBPLibrary::GetCurveValuesRange(const UAnimSequenceBase* animSequence, const FName& curveName)
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{
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// Initialize a buffer to access the curve data within the specified animation sequence.
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FAnimCurveBufferAccess bufferCurveAccess(animSequence, curveName);
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// Check if the curve data is valid and accessible.
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if (bufferCurveAccess.IsValid())
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{
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const int32 numSamples = bufferCurveAccess.GetNumSamples(); // Get the total number of samples in the curve.
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// Ensure there are at least two samples to calculate a meaningful range.
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if (numSamples >= 2)
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{
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// Calculate the range by subtracting the first sample value from the last sample value.
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return (bufferCurveAccess.GetValue(numSamples - 1) - bufferCurveAccess.GetValue(0));
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}
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}
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return 0.f; // Return 0 if the curve is invalid or does not have enough data points.
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}
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float UOLSLocomotionBPLibrary::GetTimeAfterDistanceTraveled(const UAnimSequenceBase* animSequence,
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float currentTime,
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float distanceTraveled, FName curveName,
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const bool shouldAllowLooping)
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{
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float newTime = currentTime;
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if (animSequence)
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{
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// Avoid infinite loops if the animation doesn't cover any distance.
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if (!FMath::IsNearlyZero(GetCurveValuesRange(animSequence, curveName)))
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{
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float accumulatedDistance = 0.f;
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const float sequenceLength = animSequence->GetPlayLength();
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constexpr float stepTime = 1.f / 30.f;
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// Distance Matching expects the distance curve on the animation to increase monotonically. If the curve fails to increase in value
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// after a certain number of iterations, we abandon the algorithm to avoid an infinite loop.
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// Traverse the distance curve, accumulating animated distance until the desired distance is reached.
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while ((accumulatedDistance < distanceTraveled) && (shouldAllowLooping || (newTime + stepTime < sequenceLength)))
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{
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const float currentDistance = GetCurveValueAtTime(animSequence, newTime, curveName);
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const float distanceAfterStep = GetCurveValueAtTime(animSequence, newTime + stepTime, curveName);
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const float animationDistanceThisStep = distanceAfterStep - currentDistance;
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if (!FMath::IsNearlyZero(animationDistanceThisStep))
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{
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// Keep advancing if the desired distance hasn't been reached.
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if (accumulatedDistance + animationDistanceThisStep < distanceTraveled)
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{
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FAnimationRuntime::AdvanceTime(shouldAllowLooping, stepTime, newTime, sequenceLength);
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accumulatedDistance += animationDistanceThisStep;
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}
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// Once the desired distance is passed, find the approximate time between samples where the distance will be reached.
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else
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{
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const float DistanceAlpha = (distanceTraveled - accumulatedDistance) / animationDistanceThisStep;
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FAnimationRuntime::AdvanceTime(shouldAllowLooping, DistanceAlpha * stepTime, newTime, sequenceLength);
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break;
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}
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}
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else
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{
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FAnimationRuntime::AdvanceTime(shouldAllowLooping, stepTime, newTime, sequenceLength);
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break;
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}
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT(
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"Anim sequence (%s) is missing a distance curve or doesn't cover enough distance for GetTimeAfterDistanceTraveled."
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), *GetNameSafe(animSequence));
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning, TEXT("Invalid AnimSequence passed to GetTimeAfterDistanceTraveled"));
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}
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return newTime;
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}
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FSequenceEvaluatorReference UOLSLocomotionBPLibrary::AdvanceTimeByDistanceMatching(float& outDesiredPlayRate,
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const FAnimUpdateContext& updateContext,
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const FSequenceEvaluatorReference& sequenceEvaluator,
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const float distanceTraveled,
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const FName curveName,
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const FVector2D playRateClamp /* = FVector2D(0.75f, 1.25f)*/)
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{
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sequenceEvaluator.CallAnimNodeFunction<FAnimNode_SequenceEvaluator>(
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TEXT("AdvanceTimeByDistanceMatching"),
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[&outDesiredPlayRate, updateContext, distanceTraveled, curveName, playRateClamp](
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FAnimNode_SequenceEvaluator& inSequenceEvaluator)
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{
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if (const FAnimationUpdateContext* animationUpdateContext = updateContext.GetContext())
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{
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const float deltaTime = animationUpdateContext->GetDeltaTime();
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if (deltaTime > 0 && distanceTraveled > 0)
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{
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if (const UAnimSequenceBase* animSequence = inSequenceEvaluator.GetSequence())
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{
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const float currentTime = inSequenceEvaluator.GetExplicitTime();
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const float currentAssetLength = inSequenceEvaluator.GetCurrentAssetLength();
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const bool shouldAllowLooping = inSequenceEvaluator.IsLooping();
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float timeAfterDistanceTraveled = GetTimeAfterDistanceTraveled(
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animSequence,
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currentTime,
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distanceTraveled,
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curveName,
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shouldAllowLooping);
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// Calculate the effective playrate that would result from advancing the animation by the distance traveled.
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// // Account for the animation looping.
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if (timeAfterDistanceTraveled < currentTime)
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{
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timeAfterDistanceTraveled += currentAssetLength;
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}
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float effectivePlayRate = (timeAfterDistanceTraveled - currentTime) / deltaTime;
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outDesiredPlayRate = effectivePlayRate;
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// Clamp the effective play rate.
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if (playRateClamp.X >= 0.f && playRateClamp.X < playRateClamp.Y)
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{
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effectivePlayRate = FMath::Clamp(effectivePlayRate, playRateClamp.X, playRateClamp.Y);
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}
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// Advance animation time by the effective play rate.
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float newTime = currentTime;
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FAnimationRuntime::AdvanceTime(false, effectivePlayRate * deltaTime, newTime,
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currentAssetLength);
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if (!inSequenceEvaluator.SetExplicitTime(newTime))
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT(
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"Could not set explicit time on sequence evaluator, value is not dynamic. Set it as Always Dynamic."
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));
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning, TEXT("Sequence evaluator does not have an anim sequence to play."));
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}
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT("AdvanceTimeByDistanceMatching called with invalid context"));
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}
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});
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return sequenceEvaluator;
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}
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FSequenceEvaluatorReference UOLSLocomotionBPLibrary::DistanceMatchToTarget(const FAnimUpdateContext& updateContext,
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const FSequenceEvaluatorReference& sequenceEvaluator,
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float distanceToTarget,
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bool shouldDistanceMatchStop,
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float stopDistanceThreshHold,
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float animEndTime,
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FName curveName)
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{
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sequenceEvaluator.CallAnimNodeFunction<FAnimNode_SequenceEvaluator>(
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TEXT("DistanceMatchToTarget"),
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[updateContext,sequenceEvaluator,distanceToTarget, shouldDistanceMatchStop,stopDistanceThreshHold,animEndTime,
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curveName](
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FAnimNode_SequenceEvaluator& inSequenceEvaluator)
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{
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if (const UAnimSequenceBase* animSequence = inSequenceEvaluator.GetSequence())
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{
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if (GetCurveValueAtTime(animSequence,
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USequenceEvaluatorLibrary::GetAccumulatedTime(sequenceEvaluator),
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curveName) > stopDistanceThreshHold && !shouldDistanceMatchStop)
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{
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const float newTime = GetTimeAtCurveValue(animSequence, -distanceToTarget, curveName);
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if (!inSequenceEvaluator.SetExplicitTime(newTime))
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT(
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"Could not set explicit time on sequence evaluator, value is not dynamic. Set it as Always Dynamic."
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));
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}
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}
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else
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{
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USequenceEvaluatorLibrary::AdvanceTime(updateContext, sequenceEvaluator, 1.0f);
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if (animEndTime > 0)
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{
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const float desiredTime = FMath::Clamp(
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USequenceEvaluatorLibrary::GetAccumulatedTime(sequenceEvaluator), 0, animEndTime);
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USequenceEvaluatorLibrary::SetExplicitTime(sequenceEvaluator, desiredTime);
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}
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT("Sequence evaluator does not have an anim sequence to play."));
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}
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});
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return sequenceEvaluator;
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}
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FSequencePlayerReference UOLSLocomotionBPLibrary::SetPlayRateToMatchSpeed(const FSequencePlayerReference& sequencePlayer,
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float speedToMatch,
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FVector2D playRateClamp)
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{
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sequencePlayer.CallAnimNodeFunction<FAnimNode_SequencePlayer>(
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TEXT("SetPlayrateToMatchSpeed"),
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[speedToMatch, playRateClamp](FAnimNode_SequencePlayer& sequencePlayer)
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{
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if (const UAnimSequence* animSequence = Cast<UAnimSequence>(sequencePlayer.GetSequence()))
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{
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const float animLength = animSequence->GetPlayLength();
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if (!FMath::IsNearlyZero(animLength))
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{
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// Calculate the speed as: (distance traveled by the animation) / (length of the animation)
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const FVector rootMotionTranslation = animSequence->ExtractRootMotionFromRange(0.0f, animLength).
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GetTranslation();
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const float rootMotionDistance = rootMotionTranslation.Size2D();
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if (!FMath::IsNearlyZero(rootMotionDistance))
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{
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const float animationSpeed = rootMotionDistance / animLength;
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float desiredPlayRate = speedToMatch / animationSpeed;
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if (playRateClamp.X >= 0.0f && playRateClamp.X < playRateClamp.Y)
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{
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desiredPlayRate = FMath::Clamp(desiredPlayRate, playRateClamp.X, playRateClamp.Y);
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}
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if (!sequencePlayer.SetPlayRate(desiredPlayRate))
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT(
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"Could not set play rate on sequence player, value is not dynamic. Set it as Always Dynamic."
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));
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT("Unable to adjust playrate for animation with no root motion delta (%s)."),
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*GetNameSafe(animSequence));
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT("Unable to adjust playrate for zero length animation (%s)."),
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*GetNameSafe(animSequence));
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}
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}
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else
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{
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UE_LOG(LogOLSLocomotionLibrary, Warning,
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TEXT("Sequence player does not have an anim sequence to play."));
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}
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});
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return sequencePlayer;
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}
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FVector UOLSLocomotionBPLibrary::PredictGroundMovementStopLocation(const FVector& velocity,
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bool shouldUseSeparateBrakingFriction,
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float brakingFriction, float groundFriction,
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float brakingFrictionFactor,
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float brakingDecelerationWalking)
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{
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FVector predictedStopLocation = FVector::ZeroVector;
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// Determine the actual braking friction
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float actualBrakingFriction = shouldUseSeparateBrakingFriction ? brakingFriction : groundFriction;
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actualBrakingFriction = FMath::Max(0.f, actualBrakingFriction * FMath::Max(0.f, brakingFrictionFactor));
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// Calculate 2D velocity and speed
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const FVector velocity2D = FVector(velocity.X, velocity.Y, 0.f);
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const float speed2D = velocity2D.Size();
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// Check if there's movement to stop
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if (speed2D > 0.f)
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{
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// Calculate braking divisor
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const float divisor = actualBrakingFriction * speed2D + FMath::Max(0.f, brakingDecelerationWalking);
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// Check if stopping is possible
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if (divisor > 0.f)
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{
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// Calculate time to stop
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const float timeToStop = speed2D / divisor;
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// Calculate predicted stop location
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predictedStopLocation = velocity2D * timeToStop + 0.5f * ((-actualBrakingFriction) * velocity2D -
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brakingDecelerationWalking * velocity2D.GetSafeNormal()) * FMath::Square(timeToStop);
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}
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}
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return predictedStopLocation;
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}
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FVector UOLSLocomotionBPLibrary::PredictGroundMovementPivotLocation(const FVector& acceleration,
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const FVector& velocity,
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float groundFriction)
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{
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FVector predictedPivotLocation = FVector::ZeroVector;
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const FVector acceleration2D = acceleration * FVector(1.f, 1.f, 0.f);
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const float accelerationSize2D = acceleration2D.Size();
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// Check if velocity is along the opposite direction of acceleration
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if ((velocity | acceleration2D) < 0.0f)
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{
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const float speedAlongAcceleration = -(velocity | acceleration2D);
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const float divisor = accelerationSize2D + 2.f * speedAlongAcceleration * groundFriction;
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// Check if stopping is possible
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if (divisor > 0.f)
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{
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const float timeToDirectionChange = speedAlongAcceleration / divisor;
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// Calculate the acceleration force
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const FVector accelerationForce = acceleration - (velocity - acceleration2D * velocity.Size2D()) * groundFriction;
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// Calculate the predicted pivot location
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predictedPivotLocation = velocity * timeToDirectionChange + 0.5f * accelerationForce * timeToDirectionChange * timeToDirectionChange;
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}
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}
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return predictedPivotLocation;
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}
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EOLSCardinalDirection UOLSLocomotionBPLibrary::SelectCardinalDirectionFromAngle(float angle,
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float deadZone,
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EOLSCardinalDirection currentDirection,
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bool useCurrentDirection /* = false */)
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{
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const float absAngle = FMath::Abs(angle);
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float fwdDeadZone = deadZone;
|
|
float bwdDeadZone = deadZone;
|
|
|
|
if (useCurrentDirection)
|
|
{
|
|
if (currentDirection == EOLSCardinalDirection::EForward)
|
|
{
|
|
fwdDeadZone *= 2.f;
|
|
}
|
|
else if (currentDirection == EOLSCardinalDirection::EBackward)
|
|
{
|
|
bwdDeadZone *= 2.f;
|
|
}
|
|
}
|
|
|
|
if(absAngle <= (45 + fwdDeadZone))
|
|
{
|
|
return EOLSCardinalDirection::EForward;
|
|
}
|
|
else if (absAngle >= (135 - bwdDeadZone))
|
|
{
|
|
return EOLSCardinalDirection::EBackward;
|
|
}
|
|
else if (angle > 0)
|
|
{
|
|
return EOLSCardinalDirection::ERight;
|
|
}
|
|
|
|
return EOLSCardinalDirection::ELeft;
|
|
}
|
|
|
|
EOLSCardinalDirection UOLSLocomotionBPLibrary::GetOppositeCardinalDirectional(EOLSCardinalDirection currentDirection)
|
|
{
|
|
switch (currentDirection)
|
|
{
|
|
case EOLSCardinalDirection::EForward: {return EOLSCardinalDirection::EBackward;}
|
|
case EOLSCardinalDirection::EBackward: {return EOLSCardinalDirection::EForward;}
|
|
case EOLSCardinalDirection::ELeft: {return EOLSCardinalDirection::ERight;}
|
|
case EOLSCardinalDirection::ERight: {return EOLSCardinalDirection::ELeft;}
|
|
}
|
|
|
|
return EOLSCardinalDirection::EForward;
|
|
}
|
|
|
|
EOLSHipDirection UOLSLocomotionBPLibrary::GetOppositeHipDirection(EOLSHipDirection currentHipDirection)
|
|
{
|
|
return (currentHipDirection == EOLSHipDirection::EForward ? EOLSHipDirection::EBackward : EOLSHipDirection::EForward);
|
|
}
|
|
|
|
void UOLSLocomotionBPLibrary::TryLinkAnimLayer(USkeletalMeshComponent* mesh,
|
|
TSubclassOf<UAnimInstance> animClass,
|
|
FName groupName,
|
|
bool shouldUnlinkGroupIfInvalid)
|
|
{
|
|
if (!animClass->IsValidLowLevelFast())
|
|
{
|
|
if (shouldUnlinkGroupIfInvalid)
|
|
{
|
|
if (const TObjectPtr<UAnimInstance> linkedAnimInstance = mesh->GetLinkedAnimLayerInstanceByGroup(groupName))
|
|
{
|
|
mesh->UnlinkAnimClassLayers(linkedAnimInstance.GetClass());
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
mesh->LinkAnimClassLayers(animClass);
|
|
}
|