private glTFLoader.Schema.Animation CreateAnimation(AoMEngineLibrary.Graphics.Model.Animation animation, int weightCount, Stream bufferStream)
{
var sampler = new AnimationSampler();
sampler.Interpolation = AnimationSampler.InterpolationEnum.LINEAR;
CreateKeysBuffer(animation, bufferStream);
sampler.Input = accessors.Count - 1;
CreateWeightsBuffer(animation, weightCount, bufferStream);
sampler.Output = accessors.Count - 1;
var target = new AnimationChannelTarget();
target.Node = 0;
target.Path = AnimationChannelTarget.PathEnum.weights;
var channel = new AnimationChannel();
channel.Sampler = 0;
channel.Target = target;
var gltfAnimation = new glTFLoader.Schema.Animation();
gltfAnimation.Samplers = new[] { sampler };
gltfAnimation.Channels = new[] { channel };
return(gltfAnimation);
}
private void CreateWeightsBuffer(AoMEngineLibrary.Graphics.Model.Animation animation, int weightCount, Stream bufferStream)
{
long bufferViewOffset;
using (BinaryWriter writer = new BinaryWriter(bufferStream, Encoding.UTF8, true))
{
// padding
writer.Write(new byte[(-bufferStream.Length) & (PaddingBytes(Accessor.ComponentTypeEnum.FLOAT) - 1)]);
bufferViewOffset = bufferStream.Length;
for (int i = 0; i < weightCount; ++i)
{
writer.Write(0.0f);
}
for (int i = 1; i < animation.MeshKeys.Count; ++i)
{
for (int j = 0; j < weightCount; ++j)
{
writer.Write(i == j + 1 ? 1.0f : 0.0f);
}
}
}
BufferView posBufferView = new BufferView();
posBufferView.Buffer = 0;
posBufferView.ByteLength = animation.MeshKeys.Count * weightCount * 4;
posBufferView.ByteOffset = (int)bufferViewOffset;
posBufferView.Name = "weightsBufferView";
Accessor posAccessor = new Accessor();
posAccessor.BufferView = bufferViews.Count;
posAccessor.ByteOffset = 0;
posAccessor.ComponentType = Accessor.ComponentTypeEnum.FLOAT;
posAccessor.Count = animation.MeshKeys.Count * weightCount;
posAccessor.Max = new[] { 1.0f };
posAccessor.Min = new[] { 0.0f };
posAccessor.Name = "weightsBufferViewAccessor";
posAccessor.Type = Accessor.TypeEnum.SCALAR;
bufferViews.Add(posBufferView);
accessors.Add(posAccessor);
}
private void CreateKeysBuffer(AoMEngineLibrary.Graphics.Model.Animation animation, Stream bufferStream)
{
long bufferViewOffset;
float min = float.MaxValue;
float max = float.MinValue;
using (BinaryWriter writer = new BinaryWriter(bufferStream, Encoding.UTF8, true))
{
// padding
writer.Write(new byte[(-bufferStream.Length) & (PaddingBytes(Accessor.ComponentTypeEnum.FLOAT) - 1)]);
bufferViewOffset = bufferStream.Length;
for (int i = 0; i < animation.MeshKeys.Count; ++i)
{
min = Math.Min(min, animation.MeshKeys[i]);
max = Math.Max(max, animation.MeshKeys[i]);
writer.Write(animation.MeshKeys[i]);
}
}
BufferView posBufferView = new BufferView();
posBufferView.Buffer = 0;
posBufferView.ByteLength = animation.MeshKeys.Count * 4;
posBufferView.ByteOffset = (int)bufferViewOffset;
posBufferView.Name = "keysBufferView";
Accessor posAccessor = new Accessor();
posAccessor.BufferView = bufferViews.Count;
posAccessor.ByteOffset = 0;
posAccessor.ComponentType = Accessor.ComponentTypeEnum.FLOAT;
posAccessor.Count = animation.MeshKeys.Count;
posAccessor.Max = new[] { max };
posAccessor.Min = new[] { min };
posAccessor.Name = "keysBufferViewAccessor";
posAccessor.Type = Accessor.TypeEnum.SCALAR;
bufferViews.Add(posBufferView);
accessors.Add(posAccessor);
}
