public int[] GetIndices(int index)
{
var accessor = accessors[index];
var view = bufferViews[accessor.bufferView];
switch ((glComponentType)accessor.componentType)
{
case glComponentType.UNSIGNED_BYTE:
{
var indices = GetAttrib <Byte>(accessor, view);
return(TriangleUtil.FlipTriangle(indices).ToArray());
}
case glComponentType.UNSIGNED_SHORT:
{
var indices = GetAttrib <UInt16>(accessor, view);
return(TriangleUtil.FlipTriangle(indices).ToArray());
}
/*
* case glComponentType.INT:
* {
* var indices = GetAttrib<Int32>(accessor, view);
* return FlipTriangle(indices).ToArray();
* }
*/
case glComponentType.UNSIGNED_INT:
{
var indices = GetAttrib <UInt32>(accessor, view);
return(TriangleUtil.FlipTriangle(indices).ToArray());
}
}
throw new NotImplementedException("GetIndices: unknown componenttype: " + accessor.componentType);
}
static glTFMesh ExportPrimitives(glTF gltf, int bufferIndex,
string rendererName,
Mesh mesh, Material[] materials,
List <Material> unityMaterials)
{
var positions = mesh.vertices.Select(y => y.ReverseZ()).ToArray();
var positionAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, positions, glBufferTarget.ARRAY_BUFFER);
gltf.accessors[positionAccessorIndex].min = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Min(a.x, b.x), Math.Min(a.y, b.y), Mathf.Min(a.z, b.z))).ToArray();
gltf.accessors[positionAccessorIndex].max = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Max(a.x, b.x), Math.Max(a.y, b.y), Mathf.Max(a.z, b.z))).ToArray();
var normalAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.normals.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
#if GLTF_EXPORT_TANGENTS
var tangentAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.tangents.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
#endif
var uvAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.uv.Select(y => y.ReverseUV()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var colorAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.colors, glBufferTarget.ARRAY_BUFFER);
var boneweights = mesh.boneWeights;
var weightAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, boneweights.Select(y => new Vector4(y.weight0, y.weight1, y.weight2, y.weight3)).ToArray(), glBufferTarget.ARRAY_BUFFER);
var jointsAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, boneweights.Select(y => new UShort4((ushort)y.boneIndex0, (ushort)y.boneIndex1, (ushort)y.boneIndex2, (ushort)y.boneIndex3)).ToArray(), glBufferTarget.ARRAY_BUFFER);
var attributes = new glTFAttributes
{
POSITION = positionAccessorIndex,
};
if (normalAccessorIndex != -1)
{
attributes.NORMAL = normalAccessorIndex;
}
#if GLTF_EXPORT_TANGENTS
if (tangentAccessorIndex != -1)
{
attributes.TANGENT = tangentAccessorIndex;
}
#endif
if (uvAccessorIndex != -1)
{
attributes.TEXCOORD_0 = uvAccessorIndex;
}
if (colorAccessorIndex != -1)
{
attributes.COLOR_0 = colorAccessorIndex;
}
if (weightAccessorIndex != -1)
{
attributes.WEIGHTS_0 = weightAccessorIndex;
}
if (jointsAccessorIndex != -1)
{
attributes.JOINTS_0 = jointsAccessorIndex;
}
var gltfMesh = new glTFMesh(mesh.name);
for (int j = 0; j < mesh.subMeshCount; ++j)
{
var indices = TriangleUtil.FlipTriangle(mesh.GetIndices(j)).Select(y => (uint)y).ToArray();
var indicesAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, indices, glBufferTarget.ELEMENT_ARRAY_BUFFER);
if (j >= materials.Length)
{
Debug.LogWarningFormat("{0}.materials is not enough", rendererName);
break;
}
gltfMesh.primitives.Add(new glTFPrimitives
{
attributes = attributes,
indices = indicesAccessorIndex,
mode = 4, // triangels ?
material = unityMaterials.IndexOf(materials[j])
});
}
return(gltfMesh);
}
// multiple submesh sharing same VertexBuffer
private static MeshContext _ImportMeshSharingVertexBuffer(ImporterContext ctx, glTFMesh gltfMesh)
{
var context = new MeshContext();
{
var prim = gltfMesh.primitives.First();
context.positions = ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).SelectInplace(x => x.ReverseZ());
// normal
if (prim.attributes.NORMAL != -1)
{
context.normals = ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).SelectInplace(x => x.ReverseZ());
}
// tangent
if (prim.attributes.TANGENT != -1)
{
context.tangents = ctx.GLTF.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).SelectInplace(x => x.ReverseZ());
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
context.uv = ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).SelectInplace(x => x.ReverseY());
}
else
{
// for inconsistent attributes in primitives
context.uv = new Vector2[context.positions.Length];
}
// color
if (prim.attributes.COLOR_0 != -1)
{
context.colors = ctx.GLTF.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0);
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = ctx.GLTF.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = ctx.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(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.POSITION), x => x.ReverseZ());
}
if (primTarget.NORMAL != -1)
{
blendShape.Normals.Assign(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.NORMAL), x => x.ReverseZ());
}
if (primTarget.TANGENT != -1)
{
blendShape.Tangents.Assign(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.TANGENT), x => x.ReverseZ());
}
}
}
}
foreach (var prim in gltfMesh.primitives)
{
if (prim.indices == -1)
{
context.subMeshes.Add(TriangleUtil.FlipTriangle(Enumerable.Range(0, context.positions.Length)).ToArray());
}
else
{
var indices = ctx.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 static MeshContext _ImportMeshIndependentVertexBuffer(ImporterContext ctx, 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(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).Select(x => x.ReverseZ()));
positionCount = positions.Count - positionCount;
// normal
if (prim.attributes.NORMAL != -1)
{
normals.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).Select(x => x.ReverseZ()));
}
if (prim.attributes.TANGENT != -1)
{
tangents.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).Select(x => x.ReverseZ()));
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseY()));
}
else
{
// for inconsistent attributes in primitives
uv.AddRange(new Vector2[positionCount]);
}
// color
if (prim.attributes.COLOR_0 != -1)
{
colors.AddRange(ctx.GLTF.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0));
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = ctx.GLTF.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = ctx.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(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.POSITION).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.NORMAL != -1)
{
blendShape.Normals.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.NORMAL).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.TANGENT != -1)
{
blendShape.Tangents.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.TANGENT).Select(x => x.ReverseZ()).ToArray());
}
meshContext.blendShapes.Add(blendShape);
}
}
var indices =
(indexBuffer >= 0)
? ctx.GLTF.GetIndices(indexBuffer)
: TriangleUtil.FlipTriangle(Enumerable.Range(0, meshContext.positions.Length)).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);
}
public static Exported FromGameObject(glTF gltf, GameObject go)
{
var bytesBuffer = new ArrayByteBuffer();
var bufferIndex = gltf.AddBuffer(bytesBuffer);
var unityNodes = go.transform.Traverse()
.Skip(1) // exclude root object for the symmetry with the importer
.ToList();
#region Material
var unityMaterials = unityNodes.SelectMany(x => x.GetSharedMaterials()).Where(x => x != null).Distinct().ToList();
var unityTextures = unityMaterials.SelectMany(x => x.GetTextures()).Where(x => x != null).Distinct().ToList();
for (int i = 0; i < unityTextures.Count; ++i)
{
var texture = unityTextures[i];
var bytesWithPath = new BytesWithPath(texture);;
// add view
var view = gltf.buffers[bufferIndex].Storage.Extend(bytesWithPath.Bytes, glBufferTarget.NONE);
var viewIndex = gltf.AddBufferView(view);
// add image
var imageIndex = gltf.images.Count;
gltf.images.Add(new glTFImage
{
bufferView = viewIndex,
mimeType = bytesWithPath.Mime,
});
// add sampler
var filter = default(glFilter);
switch (texture.filterMode)
{
case FilterMode.Point:
filter = glFilter.NEAREST;
break;
default:
filter = glFilter.LINEAR;
break;
}
var wrap = default(glWrap);
switch (texture.wrapMode)
{
case TextureWrapMode.Clamp:
wrap = glWrap.CLAMP_TO_EDGE;
break;
case TextureWrapMode.Repeat:
wrap = glWrap.REPEAT;
break;
#if UNITY_2017_OR_NEWER
case TextureWrapMode.Mirror:
wrap = glWrap.MIRRORED_REPEAT;
break;
#endif
default:
throw new NotImplementedException();
}
var samplerIndex = gltf.samplers.Count;
gltf.samplers.Add(new glTFTextureSampler
{
magFilter = filter,
minFilter = filter,
wrapS = wrap,
wrapT = wrap,
});
// add texture
gltf.textures.Add(new glTFTexture
{
sampler = samplerIndex,
source = imageIndex,
});
}
gltf.materials = unityMaterials.Select(x => ExportMaterial(x, unityTextures)).ToList();
#endregion
#region Meshes
var unityMeshes = unityNodes
.Select(x => new MeshWithRenderer
{
Mesh = x.GetSharedMesh(),
Rendererer = x.GetComponent <Renderer>(),
})
.Where(x => x.Mesh != null)
.ToList();
for (int i = 0; i < unityMeshes.Count; ++i)
{
var x = unityMeshes[i];
var mesh = x.Mesh;
var materials = x.Rendererer.sharedMaterials;
var positions = mesh.vertices.Select(y => y.ReverseZ()).ToArray();
var positionAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, positions, glBufferTarget.ARRAY_BUFFER);
gltf.accessors[positionAccessorIndex].min = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Min(a.x, b.x), Math.Min(a.y, b.y), Mathf.Min(a.z, b.z))).ToArray();
gltf.accessors[positionAccessorIndex].max = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Max(a.x, b.x), Math.Max(a.y, b.y), Mathf.Max(a.z, b.z))).ToArray();
var normalAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.normals.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var tangentAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.tangents.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var colorAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.colors.Select(y => (Vector4)y).ToArray(), glBufferTarget.ARRAY_BUFFER);
var uvAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, mesh.uv.Select(y => y.ReverseY()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var boneweights = mesh.boneWeights;
var weightAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, boneweights.Select(y => new Vector4(y.weight0, y.weight1, y.weight2, y.weight3)).ToArray(), glBufferTarget.ARRAY_BUFFER);
var jointsAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, boneweights.Select(y => new UShort4((ushort)y.boneIndex0, (ushort)y.boneIndex1, (ushort)y.boneIndex2, (ushort)y.boneIndex3)).ToArray(), glBufferTarget.ARRAY_BUFFER);
var attributes = new glTFAttributes
{
POSITION = positionAccessorIndex,
};
if (normalAccessorIndex != -1)
{
attributes.NORMAL = normalAccessorIndex;
}
if (tangentAccessorIndex != -1)
{
attributes.TANGENT = tangentAccessorIndex;
}
if (colorAccessorIndex != -1)
{
attributes.COLOR_0 = colorAccessorIndex;
}
if (uvAccessorIndex != -1)
{
attributes.TEXCOORD_0 = uvAccessorIndex;
}
if (weightAccessorIndex != -1)
{
attributes.WEIGHTS_0 = weightAccessorIndex;
}
if (jointsAccessorIndex != -1)
{
attributes.JOINTS_0 = jointsAccessorIndex;
}
gltf.meshes.Add(new glTFMesh(mesh.name));
for (int j = 0; j < mesh.subMeshCount; ++j)
{
var indices = TriangleUtil.FlipTriangle(mesh.GetIndices(j)).Select(y => (uint)y).ToArray();
var indicesAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, indices, glBufferTarget.ELEMENT_ARRAY_BUFFER);
gltf.meshes.Last().primitives.Add(new glTFPrimitives
{
attributes = attributes,
indices = indicesAccessorIndex,
mode = 4, // triangels ?
//material = unityMaterials.IndexOf(materials[j])
material = unityMaterials.IndexOf(materials[0]) // JIA change for Maquette image entity
});
}
if (mesh.blendShapeCount > 0)
{
for (int j = 0; j < mesh.blendShapeCount; ++j)
{
var blendShapeVertices = mesh.vertices;
var blendShpaeNormals = mesh.normals;
var blendShapeTangents = mesh.tangents.Select(y => (Vector3)y).ToArray();
var blendShapeColors = mesh.colors.Select(y => (Vector4)y).ToArray();
var k = mesh.GetBlendShapeFrameCount(j);
mesh.GetBlendShapeFrameVertices(j, k - 1, blendShapeVertices, blendShpaeNormals, null);
var blendShapePositionAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex,
blendShapeVertices.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var blendShapeNormalAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex,
blendShpaeNormals.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var blendShapeTangentAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex,
blendShapeTangents.Select(y => y.ReverseZ()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var blendShapeColorAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex,
blendShapeColors.ToArray(), glBufferTarget.ARRAY_BUFFER);
//
// first primitive has whole blendShape
//
gltf.meshes.Last().primitives[0].targets.Add(new glTFAttributes
{
POSITION = blendShapePositionAccessorIndex,
NORMAL = blendShapeNormalAccessorIndex,
TANGENT = blendShapeTangentAccessorIndex,
COLOR_0 = blendShapeColorAccessorIndex,
});
}
}
}
#endregion
#region Skins
var unitySkins = unityNodes
.Select(x => x.GetComponent <SkinnedMeshRenderer>()).Where(x => x != null)
.ToList();
gltf.nodes = unityNodes.Select(x => ExportNode(x, unityNodes, unityMeshes.Select(y => y.Mesh).ToList(), unitySkins)).ToList();
gltf.scenes = new List <gltfScene>
{
new gltfScene
{
nodes = go.transform.GetChildren().Select(x => unityNodes.IndexOf(x)).ToArray(),
}
};
foreach (var x in unitySkins)
{
var matrices = x.sharedMesh.bindposes.Select(y => y.ReverseZ()).ToArray();
var accessor = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, matrices, glBufferTarget.NONE);
var skin = new glTFSkin
{
inverseBindMatrices = accessor,
joints = x.bones.Select(y => unityNodes.IndexOf(y)).ToArray(),
skeleton = unityNodes.IndexOf(x.rootBone),
};
var skinIndex = gltf.skins.Count;
gltf.skins.Add(skin);
foreach (var z in unityNodes.Where(y => y.Has(x)))
{
var nodeIndex = unityNodes.IndexOf(z);
gltf.nodes[nodeIndex].skin = skinIndex;
}
}
#endregion
#if UNITY_EDITOR
#region Animations
var animation = go.GetComponent <Animation>();
if (animation != null)
{
foreach (AnimationState state in animation)
{
var animationWithCurve = ExportAnimation(state.clip, go.transform, unityNodes);
foreach (var kv in animationWithCurve.SamplerMap)
{
var sampler = animationWithCurve.Animation.samplers[kv.Key];
var inputAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, kv.Value.Input);
sampler.input = inputAccessorIndex;
var outputAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, kv.Value.Output);
sampler.output = outputAccessorIndex;
// modify accessors
var outputAccessor = gltf.accessors[outputAccessorIndex];
var channel = animationWithCurve.Animation.channels.First(x => x.sampler == kv.Key);
switch (glTFAnimationTarget.GetElementCount(channel.target.path))
{
case 3:
outputAccessor.type = "VEC3";
outputAccessor.count /= 3;
break;
case 4:
outputAccessor.type = "VEC4";
outputAccessor.count /= 4;
break;
default:
throw new NotImplementedException();
}
}
gltf.animations.Add(animationWithCurve.Animation);
}
}
#endregion
#endif
// glb buffer
gltf.buffers[bufferIndex].UpdateByteLength();
return(new Exported
{
Meshes = unityMeshes,
Nodes = unityNodes.Select(x => x.transform).ToList(),
Materials = unityMaterials,
Textures = unityTextures,
});
}
// mesh is sharing morph targets.
private static MeshContext _ImportMeshSharingMorphTarget(ImporterContext ctx, glTFMesh gltfMesh)
{
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 blendShapes = new List <BlendShape>();
var meshContext = new MeshContext();
// blendshapes
var targetNames = gltfMesh.extras.targetNames;
for (int i = 1; i < gltfMesh.primitives.Count; ++i)
{
if (gltfMesh.primitives[i].targets.Count != targetNames.Count)
{
throw new FormatException(string.Format("different targets length: {0} with targetNames length.",
gltfMesh.primitives[i]));
}
}
for (var i = 0; i < targetNames.Count; i++)
{
var blendShape = new BlendShape(!string.IsNullOrEmpty(targetNames[i]) ? targetNames[i] : i.ToString());
blendShapes.Add(blendShape);
}
foreach (var prim in gltfMesh.primitives)
{
var indexOffset = positions.Count;
var indexBuffer = prim.indices;
var positionCount = positions.Count;
positions.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).Select(x => x.ReverseZ()));
positionCount = positions.Count - positionCount;
// normal
if (prim.attributes.NORMAL != -1)
{
normals.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).Select(x => x.ReverseZ()));
}
if (prim.attributes.TANGENT != -1)
{
tangents.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).Select(x => x.ReverseZ()));
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
if (ctx.IsGeneratedUniGLTFAndOlder(1, 16))
{
#pragma warning disable 0612
// backward compatibility
uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseY()));
#pragma warning restore 0612
}
else
{
uv.AddRange(ctx.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(ctx.GLTF.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0));
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = ctx.GLTF.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = ctx.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 primTarget = prim.targets[i];
if (primTarget.POSITION != -1)
{
blendShapes[i].Positions.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.POSITION).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.NORMAL != -1)
{
blendShapes[i].Normals.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.NORMAL).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.TANGENT != -1)
{
blendShapes[i].Tangents.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.TANGENT).Select(x => x.ReverseZ()).ToArray());
}
}
}
var indices =
(indexBuffer >= 0)
? ctx.GLTF.GetIndices(indexBuffer)
: TriangleUtil.FlipTriangle(Enumerable.Range(0, meshContext.positions.Length)).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();
meshContext.blendShapes = blendShapes;
return(meshContext);
}
static MeshWithMaterials ImportMesh(glTF gltf, int meshIndex, glTFMesh gltfMesh,
List <Material> materials,
GetBlendShapeName getBlendShapeName
)
{
glTFAttributes lastAttributes = null;
var sharedAttributes = true;
foreach (var prim in gltfMesh.primitives)
{
if (lastAttributes != null && !prim.attributes.Equals(lastAttributes))
{
sharedAttributes = false;
break;
}
lastAttributes = prim.attributes;
}
var positions = new List <Vector3>();
var normals = new List <Vector3>();
var tangents = new List <Vector4>();
var colors = new List <Vector4>();
var uv = new List <Vector2>();
var boneWeights = new List <BoneWeight>();
var subMeshes = new List <int[]>();
var materialIndices = new List <int>();
BlendShape[] blendShapes = null;
if (sharedAttributes)
{
// multiple submesh sharing same VertexBuffer
{
var prim = gltfMesh.primitives.First();
positions.AddRange(gltf.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).Select(x => x.ReverseZ()));
// normal
if (prim.attributes.NORMAL != -1)
{
normals.AddRange(gltf.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).Select(x => x.ReverseZ()));
}
// tangent
if (prim.attributes.TANGENT != -1)
{
tangents.AddRange(gltf.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).Select(x => x.ReverseZ()));
}
// vertex color
if (prim.attributes.COLOR_0 != -1)
{
colors.AddRange(gltf.GetArrayFromAccessor <Vector4>(prim.attributes.COLOR_0));
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
uv.AddRange(gltf.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseY()));
}
else
{
// for inconsistent attributes in primitives
uv.AddRange(new Vector2[positions.Count]);
}
// 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;
boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
if (blendShapes == null)
{
blendShapes = prim.targets.Select((x, i) => new BlendShape(getBlendShapeName(meshIndex, i))).ToArray();
}
for (int i = 0; i < prim.targets.Count; ++i)
{
//var name = string.Format("target{0}", i++);
var primTarget = prim.targets[i];
var blendShape = blendShapes[i];
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());
}
}
}
}
foreach (var prim in gltfMesh.primitives)
{
var indices = gltf.GetIndices(prim.indices).Select(x => x).ToArray();
subMeshes.Add(indices);
// material
materialIndices.Add(prim.material);
}
}
else
{
// multiple submMesh is not sharing a VertexBuffer.
// each subMesh use a independent VertexBuffer.
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));
}
}
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()));
}
// vertex color
if (prim.attributes.COLOR_0 != -1)
{
colors.AddRange(gltf.GetArrayFromAccessor <Vector4>(prim.attributes.COLOR_0));
}
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
uv.AddRange(gltf.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseY()));
}
else
{
// for inconsistent attributes in primitives
uv.AddRange(new Vector2[positionCount]);
}
// 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;
boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
if (blendShapes == null)
{
blendShapes = prim.targets.Select((x, i) => new BlendShape(i.ToString())).ToArray();
}
for (int i = 0; i < prim.targets.Count; ++i)
{
//var name = string.Format("target{0}", i++);
var primTarget = prim.targets[i];
var blendShape = blendShapes[i];
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());
}
}
}
var indices =
(indexBuffer >= 0)
? gltf.GetIndices(indexBuffer).Select(x => x + indexOffset).ToArray()
: TriangleUtil.FlipTriangle(Enumerable.Range(0, positions.Count)).ToArray() // without index array
;
subMeshes.Add(indices);
// material
materialIndices.Add(prim.material);
}
}
if (!materialIndices.Any())
{
materialIndices.Add(0);
}
//Debug.Log(prims.ToJson());
var mesh = new Mesh();
mesh.name = gltfMesh.name;
if (positions.Count > UInt16.MaxValue)
{
#if UNITY_2017_3_OR_NEWER
mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
#else
Debug.LogWarningFormat("vertices {0} exceed 65535. not implemented. Unity2017.3 supports large mesh", positions.Count);
#endif
}
mesh.vertices = positions.ToArray();
if (normals.Any())
{
mesh.normals = normals.ToArray();
}
else
{
mesh.RecalculateNormals();
}
if (tangents.Any())
{
mesh.tangents = tangents.ToArray();
}
else
{
mesh.RecalculateTangents();
}
if (colors.Any())
{
mesh.colors = colors.ConvertAll(x => new Color(x.x, x.y, x.z, 1f)).ToArray();
}
if (uv.Any())
{
mesh.uv = uv.ToArray();
}
if (boneWeights.Any())
{
mesh.boneWeights = boneWeights.ToArray();
}
mesh.subMeshCount = subMeshes.Count;
for (int i = 0; i < subMeshes.Count; ++i)
{
mesh.SetTriangles(subMeshes[i], i);
}
var result = new MeshWithMaterials
{
Mesh = mesh,
Materials = materialIndices.Select(x => materials[x]).ToArray()
};
List <Material> matList = result.Materials.ToList();
matList.RemoveAll(x => x == null);
result.Materials = matList.ToArray();
if (blendShapes != null)
{
foreach (var blendShape in blendShapes)
{
if (blendShape.Positions.Count > 0)
{
if (blendShape.Positions.Count == mesh.vertexCount)
{
mesh.AddBlendShapeFrame(blendShape.Name, FRAME_WEIGHT,
blendShape.Positions.ToArray(),
normals.Count == mesh.vertexCount ? blendShape.Normals.ToArray() : null,
null
);
}
else
{
Debug.LogWarningFormat("May be partial primitive has blendShape. Rquire separete mesh or extend blend shape, but not implemented: {0}", blendShape.Name);
}
}
}
}
return(result);
}
/// <summary>
///
/// 各primitiveが同じ attribute を共有している場合専用のローダー。
///
/// </summary>
/// <param name="ctx"></param>
/// <param name="gltfMesh"></param>
/// <returns></returns>
public void ImportMeshSharingVertexBuffer(ImporterContext ctx, glTFMesh gltfMesh)
{
{
// 同じVertexBufferを共有しているので先頭のモノを使う
var prim = gltfMesh.primitives.First();
m_positions.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).SelectInplace(x => x.ReverseZ()));
// normal
if (prim.attributes.NORMAL != -1)
{
m_normals.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).SelectInplace(x => x.ReverseZ()));
}
#if false
// tangent
if (prim.attributes.TANGENT != -1)
{
tangents.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).SelectInplace(x => x.ReverseZ()));
}
#endif
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
if (ctx.IsGeneratedUniGLTFAndOlder(1, 16))
{
#pragma warning disable 0612
// backward compatibility
m_uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).SelectInplace(x => x.ReverseY()));
#pragma warning restore 0612
}
else
{
m_uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).SelectInplace(x => x.ReverseUV()));
}
}
// uv2
if (prim.attributes.TEXCOORD_1 != -1)
{
m_uv2.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_1).SelectInplace(x => x.ReverseUV()));
}
// color
if (prim.attributes.COLOR_0 != -1)
{
if (ctx.GLTF.accessors[prim.attributes.COLOR_0].TypeCount == 3)
{
var vec3Color = ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.COLOR_0);
m_colors.AddRange(new Color[vec3Color.Length]);
for (int i = 0; i < vec3Color.Length; i++)
{
Vector3 color = vec3Color[i];
m_colors[i] = new Color(color.x, color.y, color.z);
}
}
else if (ctx.GLTF.accessors[prim.attributes.COLOR_0].TypeCount == 4)
{
m_colors.AddRange(ctx.GLTF.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0));
}
else
{
throw new NotImplementedException(string.Format("unknown color type {0}", ctx.GLTF.accessors[prim.attributes.COLOR_0].type));
}
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
var joints0 = ctx.GLTF.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = ctx.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;
m_boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
m_blendShapes.AddRange(prim.targets.Select((x, i) => new BlendShape(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 = m_blendShapes[i];
if (primTarget.POSITION != -1)
{
blendShape.Positions.Assign(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.POSITION), x => x.ReverseZ());
}
if (primTarget.NORMAL != -1)
{
blendShape.Normals.Assign(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.NORMAL), x => x.ReverseZ());
}
if (primTarget.TANGENT != -1)
{
blendShape.Tangents.Assign(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.TANGENT), x => x.ReverseZ());
}
}
}
}
foreach (var prim in gltfMesh.primitives)
{
if (prim.indices == -1)
{
m_subMeshes.Add(TriangleUtil.FlipTriangle(Enumerable.Range(0, m_positions.Count)).ToArray());
}
else
{
var indices = ctx.GLTF.GetIndices(prim.indices);
m_subMeshes.Add(indices);
}
// material
m_materialIndices.Add(prim.material);
}
}
/// <summary>
/// 各 primitive の attribute の要素が同じでない。=> uv が有るものと無いものが混在するなど
/// glTF 的にはありうる。
///
/// primitive を独立した(Independent) Mesh として扱いこれを連結する。
/// </summary>
/// <param name="ctx"></param>
/// <param name="gltfMesh"></param>
/// <returns></returns>
public void ImportMeshIndependentVertexBuffer(ImporterContext ctx, glTFMesh gltfMesh)
{
foreach (var prim in gltfMesh.primitives)
{
var indexOffset = m_positions.Count;
var indexBuffer = prim.indices;
// position は必ずある
var positionCount = m_positions.Count;
m_positions.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.POSITION).Select(x => x.ReverseZ()));
positionCount = m_positions.Count - positionCount;
// normal
if (prim.attributes.NORMAL != -1)
{
FillZero(m_normals);
m_normals.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector3>(prim.attributes.NORMAL).Select(x => x.ReverseZ()));
}
#if false
if (prim.attributes.TANGENT != -1)
{
FillZero(tangetns);
tangents.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector4>(prim.attributes.TANGENT).Select(x => x.ReverseZ()));
}
#endif
// uv
if (prim.attributes.TEXCOORD_0 != -1)
{
FillZero(m_uv);
if (ctx.IsGeneratedUniGLTFAndOlder(1, 16))
{
#pragma warning disable 0612
// backward compatibility
m_uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseY()));
#pragma warning restore 0612
}
else
{
m_uv.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_0).Select(x => x.ReverseUV()));
}
}
// uv2
if (prim.attributes.TEXCOORD_1 != -1)
{
FillZero(m_uv2);
m_uv2.AddRange(ctx.GLTF.GetArrayFromAccessor <Vector2>(prim.attributes.TEXCOORD_1).Select(x => x.ReverseUV()));
}
// color
if (prim.attributes.COLOR_0 != -1)
{
FillZero(m_colors);
m_colors.AddRange(ctx.GLTF.GetArrayFromAccessor <Color>(prim.attributes.COLOR_0));
}
// skin
if (prim.attributes.JOINTS_0 != -1 && prim.attributes.WEIGHTS_0 != -1)
{
FillZero(m_boneWeights);
var joints0 = ctx.GLTF.GetArrayFromAccessor <UShort4>(prim.attributes.JOINTS_0); // uint4
var weights0 = ctx.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;
m_boneWeights.Add(bw);
}
}
// blendshape
if (prim.targets != null && prim.targets.Count > 0)
{
for (int i = 0; i < prim.targets.Count; ++i)
{
var primTarget = prim.targets[i];
var blendShape = new BlendShape(i.ToString());
if (primTarget.POSITION != -1)
{
FillZero(blendShape.Positions);
blendShape.Positions.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.POSITION).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.NORMAL != -1)
{
FillZero(blendShape.Normals);
blendShape.Normals.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.NORMAL).Select(x => x.ReverseZ()).ToArray());
}
if (primTarget.TANGENT != -1)
{
FillZero(blendShape.Tangents);
blendShape.Tangents.AddRange(
ctx.GLTF.GetArrayFromAccessor <Vector3>(primTarget.TANGENT).Select(x => x.ReverseZ()).ToArray());
}
m_blendShapes.Add(blendShape);
}
}
var indices =
(indexBuffer >= 0)
? ctx.GLTF.GetIndices(indexBuffer)
: TriangleUtil.FlipTriangle(Enumerable.Range(0, m_positions.Count)).ToArray() // without index array
;
for (int i = 0; i < indices.Length; ++i)
{
indices[i] += indexOffset;
}
m_subMeshes.Add(indices);
// material
m_materialIndices.Add(prim.material);
}
}