/// <summary>
/// Method to determine if this track has any KeyFrames which are
/// doing anything useful - can be used to determine if this track
/// can be optimised out.
/// </summary>
public override bool HasNonZeroKeyFrames()
{
if (animationType == VertexAnimationType.Morph)
{
return(KeyFrames.Count > 0);
}
else
{
foreach (KeyFrame kbase in KeyFrames)
{
// look for keyframes which have a pose influence which is non-zero
VertexPoseKeyFrame kf = (VertexPoseKeyFrame)kbase;
foreach (PoseRef poseRef in kf.PoseRefs)
{
if (poseRef.influence > 0.0f)
{
return(true);
}
}
}
return(false);
}
}
protected void WritePoseKeyframe( BinaryWriter writer, VertexPoseKeyFrame keyFrame )
{
var start_offset = writer.Seek( 0, SeekOrigin.Current );
WriteChunk( writer, MeshChunkID.AnimationPoseKeyframe, 0 );
WriteFloat( writer, keyFrame.Time );
foreach ( var poseRef in keyFrame.PoseRefs )
{
WriteAnimationPoseRef( writer, poseRef );
}
var end_offset = writer.Seek( 0, SeekOrigin.Current );
writer.Seek( (int)start_offset, SeekOrigin.Begin );
WriteChunk( writer, MeshChunkID.AnimationPoseKeyframe, (int)( end_offset - start_offset ) );
writer.Seek( (int)end_offset, SeekOrigin.Begin );
}
/// <summary>
/// As the 'apply' method but applies to specified VertexData instead of
/// associated data.
/// </summary>
public void ApplyToVertexData(VertexData data, float time, float weight, List <Pose> poseList)
{
// Nothing to do if no keyframes
if (keyFrameList.Count == 0)
{
return;
}
// Get keyframes
KeyFrame kf1, kf2;
ushort firstKeyIndex;
float t = GetKeyFramesAtTime(time, out kf1, out kf2, out firstKeyIndex);
if (animationType == VertexAnimationType.Morph)
{
VertexMorphKeyFrame vkf1 = (VertexMorphKeyFrame)kf1;
VertexMorphKeyFrame vkf2 = (VertexMorphKeyFrame)kf2;
if (targetMode == VertexAnimationTargetMode.Hardware)
{
// If target mode is hardware, need to bind our 2 keyframe buffers,
// one to main pos, one to morph target texcoord
Debug.Assert(data.HWAnimationDataList.Count == 0,
"Haven't set up hardware vertex animation elements!");
// no use for TempBlendedBufferInfo here btw
// NB we assume that position buffer is unshared
// VertexDeclaration::getAutoOrganisedDeclaration should see to that
VertexElement posElem =
data.vertexDeclaration.FindElementBySemantic(VertexElementSemantic.Position);
// Set keyframe1 data as original position
data.vertexBufferBinding.SetBinding(posElem.Source, vkf1.VertexBuffer);
// Set keyframe2 data as derived
data.vertexBufferBinding.SetBinding(data.HWAnimationDataList[0].TargetVertexElement.Source,
vkf2.VertexBuffer);
// save T for use later
data.HWAnimationDataList[0].Parametric = t;
}
else
{
// If target mode is software, need to software interpolate each vertex
Mesh.SoftwareVertexMorph(t, vkf1.VertexBuffer, vkf2.VertexBuffer, data);
}
}
else
{
// Pose
VertexPoseKeyFrame vkf1 = (VertexPoseKeyFrame)kf1;
VertexPoseKeyFrame vkf2 = (VertexPoseKeyFrame)kf2;
// For each pose reference in key 1, we need to locate the entry in
// key 2 and interpolate the influence
List <PoseRef> poseRefList1 = vkf1.PoseRefs;
List <PoseRef> poseRefList2 = vkf2.PoseRefs;
foreach (PoseRef p1 in poseRefList1)
{
float startInfluence = p1.Influence;
float endInfluence = 0;
// Search for entry in keyframe 2 list (if not there, will be 0)
foreach (PoseRef p2 in poseRefList2)
{
if (p1.PoseIndex == p2.PoseIndex)
{
endInfluence = p2.Influence;
break;
}
}
// Interpolate influence
float influence = startInfluence + t * (endInfluence - startInfluence);
// Scale by animation weight
influence = weight * influence;
// Get pose
Debug.Assert(p1.PoseIndex <= poseList.Count);
Pose pose = poseList[p1.PoseIndex];
// apply
ApplyPoseToVertexData(pose, data, influence);
}
// Now deal with any poses in key 2 which are not in key 1
foreach (PoseRef p2 in poseRefList2)
{
bool found = false;
foreach (PoseRef p1 in poseRefList1)
{
if (p1.PoseIndex == p2.PoseIndex)
{
found = true;
break;
}
}
if (!found)
{
// Need to apply this pose too, scaled from 0 start
float influence = t * p2.Influence;
// Scale by animation weight
influence = weight * influence;
// Get pose
Debug.Assert(p2.PoseIndex <= poseList.Count);
Pose pose = poseList[p2.PoseIndex];
// apply
ApplyPoseToVertexData(pose, data, influence);
}
} // key 2 iteration
} // morph or pose animation
}
