Modified SHAnimationComponent to handle interpolation of separate position, rotation and scale keyframes

SHADE_Engine/src/Animation/SHAnimationClip.cpp

@@ -20,8 +20,8 @@ namespace SHADE
   /* Constructors                                                                      */
   /*-----------------------------------------------------------------------------------*/
   SHAnimationClip::SHAnimationClip(const SHAnimAsset& asset)
-  : ticksPerSecond { asset.ticksPerSecond }
+  : ticksPerSecond { static_cast<int>(asset.ticksPerSecond) }
-  , totalTime      { asset.duration }
+  , totalTime      { static_cast<float>(asset.duration) }
   {
     // Populate keyframes
     for (const auto& channel : asset.nodeChannels)
@@ -47,6 +47,8 @@ namespace SHADE
         newChannel.ScaleKeyFrames.emplace_back(SHAnimationKeyFrame<SHVec3>{ static_cast<int>(scaleKey.time), scaleKey.value});
       }
 
+      newChannel.MaxFrames = std::max({ newChannel.PositionKeyFrames.size(), newChannel.RotationKeyFrames.size(), newChannel.ScaleKeyFrames.size() });
+
       // Insert the channel
       channels.emplace_back(std::move(newChannel));
     }

SHADE_Engine/src/Animation/SHAnimationClip.h

@@ -51,6 +51,7 @@ namespace SHADE
       std::vector<SHAnimationKeyFrame<SHVec3>>       PositionKeyFrames;
       std::vector<SHAnimationKeyFrame<SHQuaternion>> RotationKeyFrames;
       std::vector<SHAnimationKeyFrame<SHVec3>>       ScaleKeyFrames;
+      int MaxFrames;
     };
 
     /*---------------------------------------------------------------------------------*/

SHADE_Engine/src/Animation/SHAnimatorComponent.cpp

@@ -83,6 +83,7 @@ namespace SHADE
       return;
 
     currClip = newClip;
+    secsPerTick = 1.0f / currClip->GetTicksPerSecond();
     updatePoseWithClip(0.0f);
   }
 
@@ -135,36 +136,74 @@ namespace SHADE
           bones.push(child);
         }
 
-        // Get interpolated frame
+        // Get closest frame index
-        auto firstKeyFrame = channel.KeyFrames.end();
+        const int CLOSEST_FRAME_IDX = static_cast<int>(std::floorf(poseTime * currClip->GetTicksPerSecond()));
-        auto nextKeyFrame = channel.KeyFrames.end();
+        
-        for (auto iter = channel.KeyFrames.begin(); iter != channel.KeyFrames.end(); ++iter)
+        // Calculate the matrix from interpolated values
-        {
-          const auto& KEYFRAME = *iter;
-
-          if(KEYFRAME.TimeStamp <= poseTime)
-          {
-            firstKeyFrame = iter;
-          }
-          else if (KEYFRAME.TimeStamp > poseTime)
-          {
-            nextKeyFrame = iter;
-            break;
-          }
-        }
-        // Calculate the matrix
         const int BONE_MTX_IDX = rig->GetNodeIndex(bone);
-        const float T = (poseTime - firstKeyFrame->TimeStamp) / (nextKeyFrame->TimeStamp - firstKeyFrame->TimeStamp);
         boneMatrices[BONE_MTX_IDX] = boneMatrices[BONE_MTX_IDX] * SHMatrix::Transform
         (
-          SHVec3::Lerp(firstKeyFrame->Position, nextKeyFrame->Position, T), 
+          getInterpolatedValue(channel.PositionKeyFrames, CLOSEST_FRAME_IDX, poseTime), 
-          SHQuaternion::Slerp(firstKeyFrame->Orientation, nextKeyFrame->Orientation, T), 
+          getInterpolatedValue(channel.RotationKeyFrames, CLOSEST_FRAME_IDX, poseTime),
-          SHVec3::Lerp(firstKeyFrame->Scale, nextKeyFrame->Scale, T)
+          getInterpolatedValue(channel.ScaleKeyFrames, CLOSEST_FRAME_IDX, poseTime)
         );
       }
     }
   }
 
+  SHVec3 SHAnimatorComponent::getInterpolatedValue(const std::vector<SHAnimationKeyFrame<SHVec3>>& keyframes, int closestFrameIndex, float poseTime)
+  {
+    // Find the key frames that surround the current frame index
+    auto firstKeyFrame = keyframes.end();
+    auto nextKeyFrame = keyframes.end();
+    for (auto iter = keyframes.begin(); iter != keyframes.end(); ++iter)
+    {
+      const auto& KEYFRAME = *iter;
+
+      if (KEYFRAME.FrameIndex <= closestFrameIndex)
+      {
+        firstKeyFrame = iter;
+      }
+      else if (KEYFRAME.FrameIndex > closestFrameIndex)
+      {
+        nextKeyFrame = iter;
+        break;
+      }
+    }
+
+    // Get interpolated vector
+    const float PREV_FRAME_TIME = firstKeyFrame->FrameIndex * secsPerTick;
+    const float NEXT_FRAME_TIME = nextKeyFrame->FrameIndex * secsPerTick;
+    const float T = (poseTime - PREV_FRAME_TIME) / (NEXT_FRAME_TIME - PREV_FRAME_TIME);
+    return SHVec3::Lerp(firstKeyFrame->Data, nextKeyFrame->Data, T);
+  }
+
+  SHQuaternion SHAnimatorComponent::getInterpolatedValue(const std::vector<SHAnimationKeyFrame<SHQuaternion>>& keyframes, int closestFrameIndex, float poseTime)
+  {
+    // Find the key frames that surround the current frame index
+    auto firstKeyFrame = keyframes.end();
+    auto nextKeyFrame = keyframes.end();
+    for (auto iter = keyframes.begin(); iter != keyframes.end(); ++iter)
+    {
+      const auto& KEYFRAME = *iter;
+
+      if (KEYFRAME.FrameIndex <= closestFrameIndex)
+      {
+        firstKeyFrame = iter;
+      }
+      else if (KEYFRAME.FrameIndex > closestFrameIndex)
+      {
+        nextKeyFrame = iter;
+        break;
+      }
+    }
+
+    // Get interpolated vector
+    const float PREV_FRAME_TIME = firstKeyFrame->FrameIndex * secsPerTick;
+    const float NEXT_FRAME_TIME = nextKeyFrame->FrameIndex * secsPerTick;
+    const float T = (poseTime - PREV_FRAME_TIME) / (NEXT_FRAME_TIME - PREV_FRAME_TIME);
+    return SHQuaternion::Slerp(firstKeyFrame->Data, nextKeyFrame->Data, T);
+  }
 }
 
 /*-------------------------------------------------------------------------------------*/

SHADE_Engine/src/Animation/SHAnimatorComponent.h

@@ -19,6 +19,9 @@ of DigiPen Institute of Technology is prohibited.
 #include "ECS_Base/Components/SHComponent.h"
 #include "Resource/SHHandle.h"
 #include "Math/SHMatrix.h"
+#include "Math/Vector/SHVec3.h"
+#include "Math/SHQuaternion.h"
+#include "SHAnimationClip.h"
 
 namespace SHADE
 {
@@ -119,6 +122,8 @@ namespace SHADE
     // Playback Tracking
     float currPlaybackTime = 0.0f;
     bool isPlaying = false;
+    // Useful Cached Data
+    float secsPerTick = 0.0f;
     // Buffer
     std::vector<SHMatrix> boneMatrices;
 
@@ -126,6 +131,8 @@ namespace SHADE
     /* Helper Functions                                                                */
     /*---------------------------------------------------------------------------------*/
     void updatePoseWithClip(float poseTime);
+    SHVec3 getInterpolatedValue(const std::vector<SHAnimationKeyFrame<SHVec3>>& keyframes, int closestFrameIndex, float poseTime);
+    SHQuaternion getInterpolatedValue(const std::vector<SHAnimationKeyFrame<SHQuaternion>>& keyframes, int closestFrameIndex, float poseTime);
 
     /*---------------------------------------------------------------------------------*/
     /* RTTR                                                                            */