public void SetupSkinning(GLTFRoot gltf, List <TransformWithSkin> nodes, int i)
{
var x = nodes[i];
var skinnedMeshRenderer = x.transform.GetComponent <SkinnedMeshRenderer>();
if (skinnedMeshRenderer != null)
{
var mesh = skinnedMeshRenderer.sharedMesh;
if (x.skinIndex.HasValue)
{
if (mesh == null)
{
throw new Exception();
}
if (skinnedMeshRenderer == null)
{
throw new Exception();
}
if (x.skinIndex.Value < gltf.skins.Count)
{
var skin = gltf.skins[x.skinIndex.Value];
skinnedMeshRenderer.sharedMesh = null;
var joints = skin.joints.Select(y => nodes[y].transform).ToArray();
skinnedMeshRenderer.bones = joints;
if (skin.skeleton >= 0 && skin.skeleton < nodes.Count)
{
skinnedMeshRenderer.rootBone = nodes[skin.skeleton].transform;
}
if (skin.inverseBindMatrices != -1)
{
// BlendShape only ?
#if false
// https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html
var hipsParent = nodes[0].Transform;
var calculatedBindPoses = joints.Select(y => y.worldToLocalMatrix * hipsParent.localToWorldMatrix).ToArray();
mesh.bindposes = calculatedBindPoses;
#else
var bindPoses = gltf.GetArrayFromAccessor <Matrix4x4>(skin.inverseBindMatrices)
.Select(y => y.ReverseZ()).ToArray();
mesh.bindposes = bindPoses;
#endif
}
skinnedMeshRenderer.sharedMesh = mesh;
}
}
}
}
// multiple submesh sharing same VertexBuffer
private MeshContext ImportMeshSharingVertexBuffer(GLTFRoot gltf, GLTFMesh gltfMesh)
{
var context = new MeshContext();
{
var prim = gltfMesh.primitives.First();
context.positions = gltf.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).SelectInplace(x => x.ReverseZ());
// normal
if (prim.attributes.NORMAL != -1)
{
context.normals = gltf.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).SelectInplace(x => x.ReverseZ());
}
// tangent
if (prim.attributes.TANGENT != -1)
{
context.tangents = gltf.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).SelectInplace(x => x.ReverseZ());
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
// if (ctx.IsGeneratedGLTFumaAndOlder(1, 16))
// {
// #pragma warning disable 0612
// // backward compatibility
// context.uv = ctx.gltf.GetArrayFromAccessor<Vector2>(prim.attributes.TEXCOORD_0).SelectInplace(x => x.ReverseY());
// #pragma warning restore 0612
// }
// else
// {
context.uv = gltf.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).SelectInplace(x => x.ReverseUV());
// }
}
else
{
// for inconsistent attributes in primitives
context.uv = new Vector2[context.positions.Length];
}
// color
if (prim.attributes.COLOR_0 != -1)
{
context.colors = gltf.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0);
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = gltf.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = gltf.GetArrayFromAccessor <Float4>(prim.attributes.WEIGHTS_0);
for (int i = 0; i < weights0.Length; ++i)
{
weights0[i] = weights0[i].One();
}
for (int j = 0; j < joints0.Length; ++j)
{
var bw = new BoneWeight();
bw.boneIndex0 = joints0[j].x;
bw.weight0 = weights0[j].x;
bw.boneIndex1 = joints0[j].y;
bw.weight1 = weights0[j].y;
bw.boneIndex2 = joints0[j].z;
bw.weight2 = weights0[j].z;
bw.boneIndex3 = joints0[j].w;
bw.weight3 = weights0[j].w;
context.boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
context.blendShapes.AddRange(prim.targets.Select((x, i) => new BlendShape(
i < prim.extras.targetNames.Count && !string.IsNullOrEmpty(prim.extras.targetNames[i])
? prim.extras.targetNames[i]
: i.ToString())));
for (int i = 0; i < prim.targets.Count; ++i)
{
//var name = string.Format("target{0}", i++);
var primTarget = prim.targets[i];
var blendShape = context.blendShapes[i];
if (primTarget.POSITION != -1)
{
blendShape.positions.Assign(
gltf.GetArrayFromAccessor <Vector3>(primTarget.POSITION), x => x.ReverseZ());
}
if (primTarget.NORMAL != -1)
{
blendShape.normals.Assign(
gltf.GetArrayFromAccessor <Vector3>(primTarget.NORMAL), x => x.ReverseZ());
}
if (primTarget.TANGENT != -1)
{
blendShape.tangents.Assign(
gltf.GetArrayFromAccessor <Vector3>(primTarget.TANGENT), x => x.ReverseZ());
}
}
}
}
foreach (var prim in gltfMesh.primitives)
{
if (prim.indices == -1)
{
context.subMeshes.Add(Enumerable.Range(0, context.positions.Length).FlipTriangle().ToArray());
}
else
{
var indices = gltf.GetIndices(prim.indices);
context.subMeshes.Add(indices);
}
// material
context.materialIndices.Add(prim.material);
}
return(context);
}
// multiple submMesh is not sharing a VertexBuffer.
// each subMesh use a independent VertexBuffer.
private MeshContext ImportMeshIndependentVertexBuffer(GLTFRoot gltf, GLTFMesh gltfMesh)
{
//Debug.LogWarning("_ImportMeshIndependentVertexBuffer");
var targets = gltfMesh.primitives[0].targets;
for (int i = 1; i < gltfMesh.primitives.Count; ++i)
{
if (!gltfMesh.primitives[i].targets.SequenceEqual(targets))
{
throw new NotImplementedException(string.Format("diffirent targets: {0} with {1}",
gltfMesh.primitives[i],
targets));
}
}
var positions = new List <Vector3>();
var normals = new List <Vector3>();
var tangents = new List <Vector4>();
var uv = new List <Vector2>();
var colors = new List <Color>();
var meshContext = new MeshContext();
foreach (var prim in gltfMesh.primitives)
{
var indexOffset = positions.Count;
var indexBuffer = prim.indices;
var positionCount = positions.Count;
positions.AddRange(gltf.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).Select(x => x.ReverseZ()));
positionCount = positions.Count - positionCount;
// normal
if (prim.attributes.NORMAL != -1)
{
normals.AddRange(gltf.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).Select(x => x.ReverseZ()));
}
if (prim.attributes.TANGENT != -1)
{
tangents.AddRange(gltf.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).Select(x => x.ReverseZ()));
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
uv.AddRange(gltf.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseUV()));
}
else
{
// for inconsistent attributes in primitives
uv.AddRange(new Vector2[positionCount]);
}
// color
if (prim.attributes.COLOR_0 != -1)
{
colors.AddRange(gltf.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0));
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = gltf.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = gltf.GetArrayFromAccessor <Float4>(prim.attributes.WEIGHTS_0).Select(x => x.One()).ToArray();
for (int j = 0; j < joints0.Length; ++j)
{
var bw = new BoneWeight();
bw.boneIndex0 = joints0[j].x;
bw.weight0 = weights0[j].x;
bw.boneIndex1 = joints0[j].y;
bw.weight1 = weights0[j].y;
bw.boneIndex2 = joints0[j].z;
bw.weight2 = weights0[j].z;
bw.boneIndex3 = joints0[j].w;
bw.weight3 = weights0[j].w;
meshContext.boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
for (int i = 0; i < prim.targets.Count; ++i)
{
//var name = string.Format("target{0}", i++);
var primTarget = prim.targets[i];
var blendShape = new BlendShape(!string.IsNullOrEmpty(prim.extras.targetNames[i])
? prim.extras.targetNames[i]
: i.ToString())
;
if (primTarget.POSITION != -1)
{
blendShape.positions.AddRange(
gltf.GetArrayFromAccessor <Vector3>(primTarget.POSITION).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.NORMAL != -1)
{
blendShape.normals.AddRange(
gltf.GetArrayFromAccessor <Vector3>(primTarget.NORMAL).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.TANGENT != -1)
{
blendShape.tangents.AddRange(
gltf.GetArrayFromAccessor <Vector3>(primTarget.TANGENT).Select(x => x.ReverseZ()).ToArray());
}
meshContext.blendShapes.Add(blendShape);
}
}
var indices =
(indexBuffer >= 0)
? gltf.GetIndices(indexBuffer)
: Enumerable.Range(0, meshContext.positions.Length).FlipTriangle().ToArray() // without index array
;
for (int i = 0; i < indices.Length; ++i)
{
indices[i] += indexOffset;
}
meshContext.subMeshes.Add(indices);
// material
meshContext.materialIndices.Add(prim.material);
}
meshContext.positions = positions.ToArray();
meshContext.normals = normals.ToArray();
meshContext.tangents = tangents.ToArray();
meshContext.uv = uv.ToArray();
return(meshContext);
}
