/// <summary>
/// Apply weighted transforms to the vertext data
/// </summary>
/// <param name="vertex">Vertex data</param>
/// <param name="boneTransforms">Bone transforms list</param>
/// <returns>Returns the weighted position</returns>
public static Vector3 ApplyWeight(IVertexData vertex, IEnumerable <Matrix> boneTransforms)
{
Vector3 position = vertex.HasChannel(VertexDataChannels.Position) ? vertex.GetChannelValue <Vector3>(VertexDataChannels.Position) : Vector3.Zero;
if (!IsSkinned(vertex.VertexType))
{
return(position);
}
byte[] boneIndices = vertex.HasChannel(VertexDataChannels.BoneIndices) ? vertex.GetChannelValue <byte[]>(VertexDataChannels.BoneIndices) : null;
float[] boneWeights = vertex.HasChannel(VertexDataChannels.Weights) ? vertex.GetChannelValue <float[]>(VertexDataChannels.Weights) : null;
Matrix[] transforms = boneTransforms.ToArray();
Vector3 t = Vector3.Zero;
for (int w = 0; w < boneIndices.Length; w++)
{
float weight = boneWeights[w];
if (weight > 0)
{
byte index = boneIndices[w];
var boneTransform = transforms != null ? transforms[index] : Matrix.Identity;
Vector3.TransformCoordinate(ref position, ref boneTransform, out Vector3 p);
t += (p * weight);
}
}
return(t);
}
