private void ApplyBoneOrientationToNode_(Node assNode, IBone finBone)
{
var finTransform =
MatrixTransformUtil.FromTrs(finBone.LocalPosition,
finBone.LocalRotation,
finBone.LocalScale);
var assNodeTransform = assNode.Transform;
MatrixConversionUtil.CopyFinIntoAssimp(
finTransform,
ref assNodeTransform);
assNode.Transform = assNodeTransform;
}
public void BuildAndBindMesh(
Scene assScene,
IModel finModel)
{
var meshNode = new Node("meshes");
assScene.RootNode.Children.Add(meshNode);
var primitivesByMaterial =
new ReadOnlyListDictionary <IMaterial, IPrimitive>(
finModel.Skin.Primitives,
primitive => primitive.Material);
var allFinVertices = finModel.Skin.Vertices;
var allAssVertexLocationsByFinIndex = new Vector3D[allFinVertices.Count];
var allAssVertexNormalsByFinIndex = new Vector3D[allFinVertices.Count];
for (var i = 0; i < allFinVertices.Count; ++i)
{
var finVertex = allFinVertices[i];
var location = finVertex.LocalPosition;
allAssVertexLocationsByFinIndex[i] =
new Vector3D(location.X, location.Y, location.Z);
var normal = finVertex.LocalNormal;
if (normal != null)
{
allAssVertexNormalsByFinIndex[i] =
new Vector3D(normal.X, normal.Y, normal.Z);
}
}
var finToAssVertexIndices = new int[allFinVertices.Count];
var assMeshes = assScene.Meshes;
foreach (var primitivesAndMaterial in primitivesByMaterial)
{
var meshIndex = meshNode.MeshIndices.Count;
var meshName = $"mesh {meshIndex}";
var assMesh = new Mesh(AssPrimitiveType.Triangle);
meshNode.MeshIndices.Add(meshIndex);
assMesh.Name = meshName;
for (var i = 0; i < finToAssVertexIndices.Length; ++i)
{
finToAssVertexIndices[i] = -1;
}
// Adds all primitives
var finVertexIndicesInAssMesh = new List <int>();
var assVertexCounter = 0;
foreach (var finPrimitive in primitivesAndMaterial.Value)
{
var finVertices = finPrimitive.Vertices;
// TODO: Add more support for primitives.
foreach (var finVertex in finVertices)
{
var finVertexIndex = finVertex.Index;
if (finToAssVertexIndices[finVertexIndex] == -1)
{
finToAssVertexIndices[finVertexIndex] = assVertexCounter++;
finVertexIndicesInAssMesh.Add(finVertexIndex);
}
}
switch (finPrimitive.Type)
{
case FinPrimitiveType.TRIANGLES: {
for (var v = 0; v < finVertices.Count; v += 3)
{
var assFaceVertexIndices = new int[3];
for (var i = 0; i < 3; ++i)
{
assFaceVertexIndices[i] =
finToAssVertexIndices[finVertices[v + i].Index];
}
//assMesh.Faces.Add(new Face(assFaceVertexIndices));
}
break;
}
case FinPrimitiveType.TRIANGLE_STRIP: {
for (var v = 0; v < finVertices.Count - 2; ++v)
{
var assVertexIndices = new int[3];
if (v % 2 == 0)
{
for (var i = 0; i < 3; ++i)
{
assVertexIndices[i] =
finToAssVertexIndices[finVertices[v + i].Index];
}
}
else
{
// Switches drawing order to maintain proper winding:
// https://www.khronos.org/opengl/wiki/Primitive
for (var i = 0; i < 3; ++i)
{
var swizzle = i < 2 ? 1 - i : i;
assVertexIndices[i] =
finToAssVertexIndices[finVertices[v + swizzle].Index];
}
}
//assMesh.Faces.Add(new Face(assVertexIndices));
}
break;
}
case FinPrimitiveType.QUADS: {
for (var v = 0; v < finVertices.Count; v += 4)
{
// TODO: Factor in distance like this approach:
// http://james-ramsden.com/triangulate-a-quad-mesh-in-c/
var a = finToAssVertexIndices[finVertices[v + 0].Index];
var b = finToAssVertexIndices[finVertices[v + 1].Index];
var c = finToAssVertexIndices[finVertices[v + 2].Index];
var d = finToAssVertexIndices[finVertices[v + 3].Index];
//assMesh.Faces.Add(new Face(new[] {a, b, d}));
//assMesh.Faces.Add(new Face(new[] {b, c, d}));
}
break;
}
default: throw new NotSupportedException();
}
}
// Adds all vertices to the mesh
foreach (var finVertexIndex in finVertexIndicesInAssMesh)
{
//assMesh.Vertices.Add(
// allAssVertexLocationsByFinIndex[finVertexIndex]);
// TODO: Are these allowed to be null?
var normal = allAssVertexNormalsByFinIndex[finVertexIndex];
//assMesh.Normals.Add(normal);
}
// NOTES:
// - All bones are added for each mesh
// - All bones must have at least one vertex weight in the list. If none,
// this should be vertex 0 with weight 0.
var assBones = new Dictionary <string, Bone>();
// Adds all bones to the mesh.
var finBoneQueue = new Queue <IBone>();
finBoneQueue.Enqueue(finModel.Skeleton.Root);
while (finBoneQueue.Count > 0)
{
var finBone = finBoneQueue.Dequeue();
var boneName = finBone.Name;
if (boneName != null)
{
var assBone = new Bone {
Name = boneName
};
//assMesh.Bones.Add(assBone);
assBones[boneName] = assBone;
}
foreach (var childBone in finBone.Children)
{
finBoneQueue.Enqueue(childBone);
}
}
// Adds weights for each bone.
for (var i = 0; i < finVertexIndicesInAssMesh.Count; ++i)
{
var finVertexIndex = finVertexIndicesInAssMesh[i];
var finVertex = allFinVertices[finVertexIndex];
var finWeights = finVertex.Weights;
if (finWeights != null)
{
foreach (var finWeight in finWeights)
{
var boneName = finWeight.Bone.Name;
var assBone = assBones[boneName];
if (assBone.VertexWeights.Count == 0)
{
var assOffsetMatrix = new Matrix4x4();
MatrixConversionUtil.CopyFinIntoAssimp(
finWeight.SkinToBone,
ref assOffsetMatrix);
assBone.OffsetMatrix = assOffsetMatrix;
}
assBone.VertexWeights.Add(
new VertexWeight(i, finWeight.Weight));
}
}
}
// Verifies that all bones have at least one weight.
// (Is this needed?)
foreach (var assBone in assBones.Values)
{
if (assBone.VertexWeights.Count == 0)
{
assBone.VertexWeights.Add(new VertexWeight(0, 0));
}
}
}
}