/// <summary>
/// primitive 間で vertex を共有する形で Export する。
/// UniVRM-0.71.0 以降は、MeshExporterDivided.Export もある。
///
/// * GLB/GLTF は shared(default) と divided を選択可能
/// * VRM0 は shared 仕様
/// * VRM1 は divided 仕様
///
/// /// </summary>
/// <param name="gltf"></param>
/// <param name="bufferIndex"></param>
/// <param name="unityMesh"></param>
/// <param name="unityMaterials"></param>
/// <param name="axisInverter"></param>
/// <param name="settings"></param>
/// <returns></returns>
public static (glTFMesh, Dictionary <int, int> blendShapeIndexMap) Export(ExportingGltfData data,
MeshExportInfo unityMesh, List <Material> unityMaterials,
IAxisInverter axisInverter, GltfExportSettings settings)
{
var mesh = unityMesh.Mesh;
var materials = unityMesh.Materials;
var positions = mesh.vertices.Select(axisInverter.InvertVector3).ToArray();
var positionAccessorIndex = data.ExtendBufferAndGetAccessorIndex(positions, glBufferTarget.ARRAY_BUFFER);
data.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();
data.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 = data.ExtendBufferAndGetAccessorIndex(mesh.normals.Select(y => axisInverter.InvertVector3(y.normalized)).ToArray(), glBufferTarget.ARRAY_BUFFER);
int?tangentAccessorIndex = default;
if (settings.ExportTangents)
{
tangentAccessorIndex = data.ExtendBufferAndGetAccessorIndex(mesh.tangents.Select(axisInverter.InvertVector4).ToArray(), glBufferTarget.ARRAY_BUFFER);
}
var uvAccessorIndex0 = data.ExtendBufferAndGetAccessorIndex(mesh.uv.Select(y => y.ReverseUV()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var uvAccessorIndex1 = data.ExtendBufferAndGetAccessorIndex(mesh.uv2.Select(y => y.ReverseUV()).ToArray(), glBufferTarget.ARRAY_BUFFER);
var colorAccessorIndex = -1;
var vColorState = VertexColorUtility.DetectVertexColor(mesh, materials);
if (vColorState == VertexColorState.ExistsAndIsUsed || // VColor使っている
vColorState == VertexColorState.ExistsAndMixed // VColorを使っているところと使っていないところが混在(とりあえずExportする)
)
{
// UniUnlit で Multiply 設定になっている
colorAccessorIndex = data.ExtendBufferAndGetAccessorIndex(mesh.colors, glBufferTarget.ARRAY_BUFFER);
}
var boneweights = mesh.boneWeights;
var weightAccessorIndex = data.ExtendBufferAndGetAccessorIndex(boneweights.Select(y => new Vector4(y.weight0, y.weight1, y.weight2, y.weight3)).ToArray(), glBufferTarget.ARRAY_BUFFER);
var jointsAccessorIndex = data.ExtendBufferAndGetAccessorIndex(boneweights.Select(y =>
new UShort4(
(ushort)unityMesh.GetJointIndex(y.boneIndex0),
(ushort)unityMesh.GetJointIndex(y.boneIndex1),
(ushort)unityMesh.GetJointIndex(y.boneIndex2),
(ushort)unityMesh.GetJointIndex(y.boneIndex3))
).ToArray(), glBufferTarget.ARRAY_BUFFER);
var attributes = new glTFAttributes
{
POSITION = positionAccessorIndex,
};
if (normalAccessorIndex != -1)
{
attributes.NORMAL = normalAccessorIndex;
}
if (tangentAccessorIndex.HasValue)
{
attributes.TANGENT = tangentAccessorIndex.Value;
}
if (uvAccessorIndex0 != -1)
{
attributes.TEXCOORD_0 = uvAccessorIndex0;
}
if (uvAccessorIndex1 != -1)
{
attributes.TEXCOORD_1 = uvAccessorIndex1;
}
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);
var indices = new List <uint>();
for (int j = 0; j < mesh.subMeshCount; ++j)
{
indices.Clear();
var triangles = mesh.GetIndices(j);
if (triangles.Length == 0)
{
// https://github.com/vrm-c/UniVRM/issues/664
continue;
}
for (int i = 0; i < triangles.Length; i += 3)
{
var i0 = triangles[i];
var i1 = triangles[i + 1];
var i2 = triangles[i + 2];
// flip triangle
indices.Add((uint)i2);
indices.Add((uint)i1);
indices.Add((uint)i0);
}
var indicesAccessorIndex = data.ExtendBufferAndGetAccessorIndex(indices.ToArray(), glBufferTarget.ELEMENT_ARRAY_BUFFER);
if (indicesAccessorIndex < 0)
{
// https://github.com/vrm-c/UniVRM/issues/664
throw new Exception();
}
if (j >= materials.Length)
{
Debug.LogWarningFormat("{0}.materials is not enough", unityMesh.Mesh.name);
break;
}
gltfMesh.primitives.Add(new glTFPrimitives
{
attributes = attributes,
indices = indicesAccessorIndex,
mode = 4, // triangles ?
material = unityMaterials.IndexOf(materials[j])
});
}
var blendShapeIndexMap = new Dictionary <int, int>();
{
var targetNames = new List <string>();
int exportBlendShapes = 0;
for (int j = 0; j < unityMesh.Mesh.blendShapeCount; ++j)
{
var morphTarget = ExportMorphTarget(data,
unityMesh.Mesh, j,
settings.UseSparseAccessorForMorphTarget,
settings.ExportOnlyBlendShapePosition, axisInverter);
if (morphTarget.POSITION < 0)
{
// Skip empty blendShape.
// Shift blendShape's index.
continue;
}
var blendShapeName = unityMesh.Mesh.GetBlendShapeName(j);
blendShapeIndexMap.Add(j, exportBlendShapes++);
targetNames.Add(blendShapeName);
//
// all primitive has same blendShape
//
for (int k = 0; k < gltfMesh.primitives.Count; ++k)
{
gltfMesh.primitives[k].targets.Add(morphTarget);
}
}
gltf_mesh_extras_targetNames.Serialize(gltfMesh, targetNames);
}
return(gltfMesh, blendShapeIndexMap);
}
/// <summary>
/// Divide vertex buffer(Position, Normal, UV, VertexColor, Skinning and BlendShapes) by submesh usage, then export
/// </summary>
/// <param name="gltf"></param>
/// <param name="gltfBuffer"></param>
/// <param name="unityMesh"></param>
/// <param name="unityMaterials"></param>
/// <param name="axisInverter"></param>
/// <param name="settings"></param>
/// <returns></returns>
public static (glTFMesh, Dictionary <int, int>) Export(ExportingGltfData data,
MeshExportInfo unityMesh, List <Material> unityMaterials,
IAxisInverter axisInverter, GltfExportSettings settings)
{
var mesh = unityMesh.Mesh;
var gltfMesh = new glTFMesh(mesh.name);
if (settings.ExportTangents)
{
// no support
throw new NotImplementedException();
}
var positions = mesh.vertices;
var normals = mesh.normals;
var uv = mesh.uv;
var boneWeights = mesh.boneWeights;
if (boneWeights.All(x => x.weight0 == 0 && x.weight1 == 0 && x.weight2 == 0 && x.weight3 == 0))
{
boneWeights = null;
}
var colors = mesh.colors;
Func <int, int> getJointIndex = null;
if (boneWeights != null && boneWeights.Length == positions.Length)
{
getJointIndex = unityMesh.GetJointIndex;
}
Vector3[] blendShapePositions = new Vector3[mesh.vertexCount];
Vector3[] blendShapeNormals = new Vector3[mesh.vertexCount];
var vColorState = VertexColorUtility.DetectVertexColor(mesh, unityMaterials);
var exportVertexColor = (
(settings.KeepVertexColor && mesh.colors != null && mesh.colors.Length == mesh.vertexCount) || // vertex color を残す設定
vColorState == VertexColorState.ExistsAndIsUsed || // VColor使っている
vColorState == VertexColorState.ExistsAndMixed // VColorを使っているところと使っていないところが混在(とりあえずExportする)
);
var usedIndices = new List <int>();
for (int i = 0; i < mesh.subMeshCount; ++i)
{
var indices = mesh.GetIndices(i);
var hash = new HashSet <int>(indices);
// aggregate vertex attributes
var buffer = new MeshExportUtil.VertexBuffer(indices.Length, getJointIndex);
usedIndices.Clear();
for (int k = 0; k < positions.Length; ++k)
{
if (hash.Contains(k))
{
// aggregate indices
usedIndices.Add(k);
buffer.PushVertex(k,
axisInverter.InvertVector3(positions[k]), // POSITION
axisInverter.InvertVector3(normals[k]), // NORMAL
uv[k].ReverseUV() // UV
);
if (getJointIndex != null)
{
buffer.PushBoneWeight(boneWeights[k]);
}
if (exportVertexColor)
{
buffer.PushColor(colors[k]);
}
}
}
var material = unityMesh.Materials[i];
var materialIndex = -1;
if (material != null)
{
materialIndex = unityMaterials.IndexOf(material);
}
var flipped = new List <int>();
for (int j = 0; j < indices.Length; j += 3)
{
var t0 = indices[j];
var t1 = indices[j + 1];
var t2 = indices[j + 2];
flipped.Add(t2);
flipped.Add(t1);
flipped.Add(t0);
}
var gltfPrimitive = buffer.ToGltfPrimitive(data, materialIndex, flipped);
// blendShape(morph target)
for (int j = 0; j < mesh.blendShapeCount; ++j)
{
var blendShape = new MeshExportUtil.BlendShapeBuffer(usedIndices.Count);
// aggriage morph target
mesh.GetBlendShapeFrameVertices(j, 0, blendShapePositions, blendShapeNormals, null);
int l = 0;
foreach (var k in usedIndices)
{
blendShape.Set(l++,
axisInverter.InvertVector3(blendShapePositions[k]),
axisInverter.InvertVector3(blendShapeNormals[k]));
}
gltfPrimitive.targets.Add(blendShape.ToGltf(data, !settings.ExportOnlyBlendShapePosition,
settings.UseSparseAccessorForMorphTarget));
}
gltfMesh.primitives.Add(gltfPrimitive);
}
var targetNames = Enumerable.Range(0, mesh.blendShapeCount).Select(x => mesh.GetBlendShapeName(x)).ToArray();
gltf_mesh_extras_targetNames.Serialize(gltfMesh, targetNames);
return(gltfMesh, Enumerable.Range(0, mesh.blendShapeCount).ToDictionary(x => x, x => x));
}