public void Populate(Transform m, ref GlTF_Accessor invBindMatricesAccessor, int invBindAccessorIndex)
{
SkinnedMeshRenderer skinMesh = m.GetComponent <SkinnedMeshRenderer>();
if (!skinMesh)
{
return;
}
// Populate bind poses. From https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html:
// The bind pose is bone's inverse transformation matrix
// In this case we also make this matrix relative to the root
// So that we can move the root game object around freely
joints = new List <Transform>();
//Collect all bones from skin object. Order should be kept here since bones are referenced in the mesh
foreach (Transform t in skinMesh.bones)
{
joints.Add(t);
}
Matrix4x4[] invBindMatrices = new Matrix4x4[joints.Count];
for (int i = 0; i < skinMesh.bones.Length; ++i)
{
// Generates inverseWorldMatrix in right-handed coordinate system
Matrix4x4 invBind = skinMesh.sharedMesh.bindposes[i];
convertMatrixLeftToRightHandedness(ref invBind);
invBindMatrices[i] = invBind;
}
invBindMatricesAccessor.Populate(invBindMatrices, m);
invBindMatricesAccessorIndex = invBindAccessorIndex;
}
public void Populate(AnimationClip clip, Transform tr, bool bake = true)
{
// 1. browse clip, collect all curves and create a TargetCurveSet for each target
Dictionary <string, TargetCurveSet> targetCurvesBinding = new Dictionary <string, TargetCurveSet>();
collectClipCurves(clip, ref targetCurvesBinding);
// Baking needs all properties, fill missing curves with transform data in 2 keyframes (start, endTime)
// where endTime is clip duration
generateMissingCurves(clip.length, ref tr, ref targetCurvesBinding);
if (bake)
{
// Bake animation for all animated nodes
foreach (string target in targetCurvesBinding.Keys)
{
Transform targetTr = target.Length > 0 ? tr.Find(target) : tr;
if (targetTr == null)
{
continue;
}
Transform targetObject = targetTr;
string targetId = GlTF_Node.GetNameFromObject(targetObject);
// Initialize accessors for current animation
GlTF_Accessor timeAccessor = new GlTF_Accessor(targetId + "_TimeAccessor_" + clip.name, GlTF_Accessor.Type.SCALAR, GlTF_Accessor.ComponentType.FLOAT);
timeAccessor.bufferView = GlTF_Writer.floatBufferView;
int timeAccessorIndex = GlTF_Writer.accessors.Count;
GlTF_Writer.accessors.Add(timeAccessor);
// Translation
GlTF_Channel chTranslation = new GlTF_Channel("translation", animSamplers.Count);
GlTF_Target targetTranslation = new GlTF_Target();
targetTranslation.id = targetId;
targetTranslation.path = "translation";
chTranslation.target = targetTranslation;
channels.Add(chTranslation);
GlTF_AnimSampler sTranslation = new GlTF_AnimSampler(timeAccessorIndex, GlTF_Writer.accessors.Count);
GlTF_Accessor translationAccessor = new GlTF_Accessor(targetId + "_TranslationAccessor_" + clip.name, GlTF_Accessor.Type.VEC3, GlTF_Accessor.ComponentType.FLOAT);
translationAccessor.bufferView = GlTF_Writer.vec3BufferViewAnim;
GlTF_Writer.accessors.Add(translationAccessor);
animSamplers.Add(sTranslation);
// Rotation
GlTF_Channel chRotation = new GlTF_Channel("rotation", animSamplers.Count);
GlTF_Target targetRotation = new GlTF_Target();
targetRotation.id = GlTF_Node.GetNameFromObject(targetObject);
targetRotation.path = "rotation";
chRotation.target = targetRotation;
channels.Add(chRotation);
GlTF_AnimSampler sRotation = new GlTF_AnimSampler(timeAccessorIndex, GlTF_Writer.accessors.Count);
GlTF_Accessor rotationAccessor = new GlTF_Accessor(targetId + "_RotationAccessor_" + clip.name, GlTF_Accessor.Type.VEC4, GlTF_Accessor.ComponentType.FLOAT);
rotationAccessor.bufferView = GlTF_Writer.vec4BufferViewAnim;
GlTF_Writer.accessors.Add(rotationAccessor);
animSamplers.Add(sRotation);
// Scale
GlTF_Channel chScale = new GlTF_Channel("scale", animSamplers.Count);
GlTF_Target targetScale = new GlTF_Target();
targetScale.id = GlTF_Node.GetNameFromObject(targetObject);
targetScale.path = "scale";
chScale.target = targetScale;
channels.Add(chScale);
GlTF_AnimSampler sScale = new GlTF_AnimSampler(timeAccessorIndex, GlTF_Writer.accessors.Count);
GlTF_Accessor scaleAccessor = new GlTF_Accessor(targetId + "_ScaleAccessor_" + clip.name, GlTF_Accessor.Type.VEC3, GlTF_Accessor.ComponentType.FLOAT);
scaleAccessor.bufferView = GlTF_Writer.vec3BufferViewAnim;
GlTF_Writer.accessors.Add(scaleAccessor);
animSamplers.Add(sScale);
// Bake and populate animation data
float[] times = null;
Vector3[] positions = null;
Vector3[] scales = null;
Vector4[] rotations = null;
bakeCurveSet(targetCurvesBinding[target], clip.length, bakingFramerate, ref times, ref positions, ref rotations, ref scales);
// Populate accessors
timeAccessor.Populate(times);
translationAccessor.Populate(positions);
rotationAccessor.Populate(rotations, false);
scaleAccessor.Populate(scales, true);
}
}
else
{
Debug.LogError("Only baked animation is supported for now. Skipping animation");
}
}