// key - control point index
public static Dictionary <int, BoneAssignment> GetBoneAssignments(FbxMesh mesh, Skeleton skeleton)
{
var boneAssignments = new Dictionary <int, BoneAssignment>();
var weightLists = new Dictionary <int, List <(int, double)> >();
int skinCount = mesh.GetDeformerCount(FbxDeformer.EDeformerType.eSkin);
if (skinCount == 0)
{
return(null);
}
if (1 < skinCount)
{
FbxImportLog.LogMessage(mesh.GetNode(), "Warning! Multiple skins for the mesh"); //??? Может ли быть в одном Mesh несколько Skins? Скорее всего нет, хоть API позволяет.
}
FbxSkin pSkin = FbxSkin.Cast(mesh.GetDeformer(0, FbxDeformer.EDeformerType.eSkin));
int clusterCount = pSkin.GetClusterCount();
for (int iCluster = 0; iCluster < clusterCount; iCluster++)
{
FbxCluster pCluster = pSkin.GetCluster(iCluster);
FbxNode pLink = pCluster.GetLink();
if (pLink == null)
{
continue;
}
int weightCount = pCluster.GetControlPointIndicesCount();
if (weightCount == 0)
{
continue;
}
int boneIndex = skeleton.GetBoneIndexByNode(pLink);
var weightIndices = IntArray.frompointer(pCluster.GetControlPointIndices());
var weightValues = DoubleArray.frompointer(pCluster.GetControlPointWeights());
for (int i = 0; i < weightCount; i++)
{
int vertexIndex = weightIndices.getitem(i);
double weight = weightValues.getitem(i);
if (!weightLists.TryGetValue(vertexIndex, out var lst))
{
lst = new List <(int, double)>();
weightLists[vertexIndex] = lst;
}
lst.Add((boneIndex, weight));
}
}
foreach (var pair in weightLists)
{
boneAssignments[pair.Key] = ConvertBoneWeightListToBoneAssignment(pair.Value);
}
return(boneAssignments);
}