private List <Action <float> > LoadAnimations(Animation[] animations, List <byte[]> byteBuffers)
{
var animationController = new List <Action <float> >();
if (animations is null)
{
return(animationController);
}
if (byteBuffers is null)
{
throw new ArgumentNullException(nameof(byteBuffers));
}
var accessorBuffers = new Dictionary <int, Array>();
TYPE[] GetBuffer <TYPE>(int accessorId) where TYPE : struct
{
if (accessorBuffers.TryGetValue(accessorId, out var buf))
{
return(buf as TYPE[]);
}
var accessor = gltf.Accessors[accessorId];
var view = gltf.BufferViews[accessor.BufferView.Value];
var buffer = FromByteArray <TYPE>(byteBuffers[view.Buffer],
view.ByteOffset + accessor.ByteOffset, accessor.Count);
accessorBuffers.Add(accessorId, buffer);
return(buffer);
}
foreach (var animation in animations)
{
void AddAnimationControllerTranslate(AnimationChannel channel)
{
var sampler = animation.Samplers[channel.Sampler];
var bufferTimes = GetBuffer <float>(sampler.Input);
var bufferOutput = GetBuffer <Vector3>(sampler.Output);
var controlPoints = new ControlPoints <Vector3>(bufferTimes, bufferOutput);
var node = gltf.Nodes[channel.Target.Node.Value];
void Interpolator(float t)
{
var inter = controlPoints.FindPair(t);
var interpolated = Vector3.Lerp(inter.Item1, inter.Item2, inter.Item3);
node.Translation = interpolated.ToArray();
localTransforms[channel.Target.Node.Value] = CreateLocalTransform(node);
}
animationController.Add(Interpolator);
}
void AddAnimationControllerRotation(AnimationChannel channel)
{
var sampler = animation.Samplers[channel.Sampler];
var bufferTimes = GetBuffer <float>(sampler.Input);
var bufferOutput = GetBuffer <Quaternion>(sampler.Output);
var controlPoints = new ControlPoints <Quaternion>(bufferTimes, bufferOutput);
var node = gltf.Nodes[channel.Target.Node.Value];
void Interpolator(float t)
{
var inter = controlPoints.FindPair(t);
var interpolated = Quaternion.Lerp(inter.Item1, inter.Item2, inter.Item3);
node.Rotation = interpolated.ToArray();
localTransforms[channel.Target.Node.Value] = CreateLocalTransform(node);
}
animationController.Add(Interpolator);
}
void AddAnimationControllerScale(AnimationChannel channel)
{
var sampler = animation.Samplers[channel.Sampler];
var bufferTimes = GetBuffer <float>(sampler.Input);
var node = gltf.Nodes[channel.Target.Node.Value];
var bufferOutput = GetBuffer <Vector3>(sampler.Output);
var controlPoints = new ControlPoints <Vector3>(bufferTimes, bufferOutput);
void Interpolator(float t)
{
var inter = controlPoints.FindPair(t);
var interpolated = Vector3.Lerp(inter.Item1, inter.Item2, inter.Item3);
node.Scale = interpolated.ToArray();
localTransforms[channel.Target.Node.Value] = CreateLocalTransform(node);
}
animationController.Add(Interpolator);
}
foreach (var channel in animation.Channels)
{
if (!channel.Target.Node.HasValue)
{
continue;
}
switch (channel.Target.Path)
{
case AnimationChannelTarget.PathEnum.rotation:
AddAnimationControllerRotation(channel);
break;
case AnimationChannelTarget.PathEnum.translation:
AddAnimationControllerTranslate(channel);
break;
case AnimationChannelTarget.PathEnum.scale:
AddAnimationControllerScale(channel);
break;
default:
break;
}
}
}
return(animationController);
}