public static IEnumerator BuildMeshCoroutine(ImporterContext ctx, MeshImporter.MeshContext meshContext)
{
var(mesh, recalculateTangents) = _BuildMesh(meshContext);
if (recalculateTangents)
{
yield return(null);
mesh.RecalculateTangents();
yield return(null);
}
var result = new MeshWithMaterials
{
Mesh = mesh,
Materials = meshContext.MaterialIndices.Select(x => ctx.GetMaterial(x)).ToArray()
};
yield return(null);
if (meshContext.BlendShapes.Count > 0)
{
var emptyVertices = new Vector3[mesh.vertexCount];
foreach (var blendShape in meshContext.BlendShapes)
{
BuildBlendShape(mesh, meshContext, blendShape, emptyVertices);
}
}
yield return(result);
}
public static MeshWithMaterials BuildMesh(ImporterContext ctx, MeshImporter.MeshContext meshContext)
{
if (!meshContext.materialIndices.Any())
{
meshContext.materialIndices.Add(0);
}
//Debug.Log(prims.ToJson());
var mesh = new Mesh();
mesh.name = meshContext.name;
if (meshContext.positions.Length > 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",
meshContext.positions.Length);
#endif
}
mesh.vertices = meshContext.positions;
bool recalculateNormals = false;
if (meshContext.normals != null && meshContext.normals.Length > 0)
{
mesh.normals = meshContext.normals;
}
else
{
recalculateNormals = true;
}
if (meshContext.uv != null && meshContext.uv.Length > 0)
{
mesh.uv = meshContext.uv;
}
bool recalculateTangents = true;
#if UNIGLTF_IMPORT_TANGENTS
if (meshContext.tangents != null && meshContext.tangents.Length > 0)
{
mesh.tangents = meshContext.tangents;
recalculateTangents = false;
}
#endif
if (meshContext.colors != null && meshContext.colors.Length > 0)
{
mesh.colors = meshContext.colors;
}
if (meshContext.boneWeights != null && meshContext.boneWeights.Count > 0)
{
mesh.boneWeights = meshContext.boneWeights.ToArray();
}
mesh.subMeshCount = meshContext.subMeshes.Count;
for (int i = 0; i < meshContext.subMeshes.Count; ++i)
{
mesh.SetTriangles(meshContext.subMeshes[i], i);
}
if (recalculateNormals)
{
mesh.RecalculateNormals();
}
if (recalculateTangents)
{
#if UNITY_5_6_OR_NEWER
mesh.RecalculateTangents();
#else
CalcTangents(mesh);
#endif
}
var result = new MeshWithMaterials
{
Mesh = mesh,
Materials = meshContext.materialIndices.Select(x => ctx.GetMaterial(x)).ToArray()
};
if (meshContext.blendShapes != null)
{
Vector3[] emptyVertices = null;
foreach (var blendShape in meshContext.blendShapes)
{
if (blendShape.Positions.Count > 0)
{
if (blendShape.Positions.Count == mesh.vertexCount)
{
mesh.AddBlendShapeFrame(blendShape.Name, FRAME_WEIGHT,
blendShape.Positions.ToArray(),
(meshContext.normals != null && meshContext.normals.Length == mesh.vertexCount) ? blendShape.Normals.ToArray() : null,
null
);
}
else
{
Debug.LogWarningFormat("May be partial primitive has blendShape. Require separate mesh or extend blend shape, but not implemented: {0}", blendShape.Name);
}
}
else
{
if (emptyVertices == null)
{
emptyVertices = new Vector3[mesh.vertexCount];
}
// Debug.LogFormat("empty blendshape: {0}.{1}", mesh.name, blendShape.Name);
// add empty blend shape for keep blend shape index
mesh.AddBlendShapeFrame(blendShape.Name, FRAME_WEIGHT,
emptyVertices,
null,
null
);
}
}
}
return(result);
}