/// <summary>
/// Recursive function that processes the entire scene graph, collecting up
/// all of the animation data.
/// </summary>
private void ProcessAnimationsRecursive(NodeContent input)
{
// Look up the bone for this input channel
int inputBoneIndex;
if (bones.TryGetValue(input.Name, out inputBoneIndex))
{
// Save the transform
boneTransforms[inputBoneIndex] = input.Transform;
}
foreach (KeyValuePair<string, AnimationContent> animation in input.Animations)
{
// Do we have this animation before?
AnimationClip clip;
string clipName = animation.Key;
if (!clips.TryGetValue(clipName, out clip))
{
// Never seen before clip
clip = new AnimationClip();
modelExtra.Clips.Add(clip);
// Retain by name
clips[clipName] = clip;
clip.Name = clipName;
foreach (ModelBoneContent bone in model.Bones)
{
AnimationClip.Bone clipBone = new AnimationClip.Bone();
clipBone.Name = bone.Name;
clip.Bones.Add(clipBone);
}
}
// Ensure the duration is always set
if (animation.Value.Duration.TotalSeconds > clip.Duration)
clip.Duration = animation.Value.Duration.TotalSeconds;
//
// For each channel, determine the bone and then process all of the
// keyframes for that bone.
//
foreach (KeyValuePair<string, AnimationChannel> channel in animation.Value.Channels)
{
// What is the bone index?
int boneIndex;
if (!bones.TryGetValue(channel.Key, out boneIndex))
continue; // Ignore if not a named bone
// An animation is useless if it is for a bone not assigned to any meshes at all
if (UselessAnimationTest(boneIndex))
continue;
// I'm collecting up in a linked list so we can process the data
// and remove redundant keyframes
LinkedList<AnimationClip.Keyframe> keyframes = new LinkedList<AnimationClip.Keyframe>();
foreach (AnimationKeyframe keyframe in channel.Value)
{
Matrix transform = keyframe.Transform; // Keyframe transformation
AnimationClip.Keyframe newKeyframe = new AnimationClip.Keyframe();
newKeyframe.Time = keyframe.Time.TotalSeconds;
newKeyframe.Transform = transform;
keyframes.AddLast(newKeyframe);
}
LinearKeyframeReduction(keyframes);
foreach (AnimationClip.Keyframe keyframe in keyframes)
{
clip.Bones[boneIndex].Keyframes.Add(keyframe);
}
}
}
foreach (NodeContent child in input.Children)
{
ProcessAnimationsRecursive(child);
}
}
/// <summary>
/// Entry point for animation processing.
/// </summary>
/// <param name="model"></param>
/// <param name="input"></param>
/// <param name="context"></param>
private void ProcessAnimations(ModelContent model, NodeContent input, ContentProcessorContext context)
{
// First build a lookup table so we can determine the
// index into the list of bones from a bone name.
for (int i = 0; i < model.Bones.Count; i++)
{
bones[model.Bones[i].Name] = i;
}
// For saving the bone transforms
boneTransforms = new Matrix[model.Bones.Count];
//
// Collect up all of the animation data
//
ProcessAnimationsRecursive(input);
// Ensure there is always a clip, even if none is included in the FBX
// That way we can create poses using FBX files as one-frame
// animation clips
if (modelExtra.Clips.Count == 0)
{
AnimationClip clip = new AnimationClip();
modelExtra.Clips.Add(clip);
string clipName = "Take 001";
// Retain by name
clips[clipName] = clip;
clip.Name = clipName;
foreach (ModelBoneContent bone in model.Bones)
{
AnimationClip.Bone clipBone = new AnimationClip.Bone();
clipBone.Name = bone.Name;
clip.Bones.Add(clipBone);
}
}
// Ensure all animations have a first key frame for every bone
foreach (AnimationClip clip in modelExtra.Clips)
{
for (int b = 0; b < bones.Count; b++)
{
List<AnimationClip.Keyframe> keyframes = clip.Bones[b].Keyframes;
if (keyframes.Count == 0 || keyframes[0].Time > 0)
{
AnimationClip.Keyframe keyframe = new AnimationClip.Keyframe();
keyframe.Time = 0;
keyframe.Transform = boneTransforms[b];
keyframes.Insert(0, keyframe);
}
}
}
}