private static Bone[] CreateBoneHierarchy(Assimp.Scene scene)
{
var root = SearchBoneRoot(scene, scene.RootNode);
var nodeCount = GetNodeCount(root);
var bones = new Bone[nodeCount];
CopyAssimpBone(root, bones, null, 0);
return(bones);
}
private static int CopyAssimpBone(Node node, Bone[] bones, Bone parent, int index)
{
bones[index] = new Bone
{
mName = node.Name,
mTransformation = AssimpToXna(node.Transform),
mParent = parent
};
var temporaryIndex = index;
for (var i = 0; i < node.ChildCount; i++)
{
bones[index].mChildren.Add(bones[temporaryIndex + 1]);
temporaryIndex = CopyAssimpBone(node.Children[i], bones, bones[index], temporaryIndex + 1);
}
return(temporaryIndex);
}
private static CollisionRectangle CalculateBoundingRectangle(MeshData meshData)
{
var min = Vector2.Zero;
var max = Vector2.Zero;
if (meshData.mIsSkinned)
{
// We need the matrices to calculate the actual position
var matrices = new Matrix[meshData.mBones.Length];
Bone.CalculateBoneBaseTransformation(meshData.mBones, ref matrices);
foreach (var vertex in meshData.mVerticesExt)
{
var index = vertex.BoneIndex.ToVector4();
var boneTransform = matrices[(int)index.X] * vertex.BoneWeights.X;
boneTransform += matrices[(int)index.Y] * vertex.BoneWeights.Y;
boneTransform += matrices[(int)index.Z] * vertex.BoneWeights.Z;
boneTransform += matrices[(int)index.W] * vertex.BoneWeights.W;
var location = Vector3.Transform(vertex.Position, boneTransform);
if (location.Y < BoundingRectangleBias && location.Y > 0.0f)
{
if (max == Vector2.Zero)
{
max = new Vector2(location.X, location.Z);
}
if (min == Vector2.Zero)
{
max = new Vector2(location.X, location.Z);
}
max.X = location.X > max.X ? location.X : max.X;
max.Y = location.Z > max.Y ? location.Z : max.Y;
min.X = location.X < min.X ? location.X : min.X;
min.Y = location.Z < min.Y ? location.Z : min.Y;
}
}
}
else
{
foreach (var vertex in meshData.mVertices)
{
var location = vertex.Position;
if (location.Y < BoundingRectangleBias && location.Y > 0.0f)
{
if (max == Vector2.Zero)
{
max = new Vector2(location.X, location.Z);
}
if (min == Vector2.Zero)
{
max = new Vector2(location.X, location.Z);
}
max.X = location.X > max.X ? location.X : max.X;
max.Y = location.Z > max.Y ? location.Z : max.Y;
min.X = location.X < min.X ? location.X : min.X;
min.Y = location.Z < min.Y ? location.Z : min.Y;
}
}
}
return(new CollisionRectangle(new Vector2(min.X, max.Y), min, max));
}
