private Mesh LoadMesh(glTFLoader.Schema.MeshPrimitive[] primitives)
{
var subMeshes = new GltfMesh[primitives.Length];
for (int i = 0; i < primitives.Length; i++)
{
var primitive = primitives[i];
subMeshes[i] = LoadSubMesh(primitive);
}
return(CreateUnityMesh(subMeshes));
}
private GltfMesh LoadSubMesh(glTFLoader.Schema.MeshPrimitive primitive)
{
var mesh = new GltfMesh();
// Consider moving this logic into another class (SubMeshLoader.cs?)
foreach (var attribute in primitive.Attributes)
{
LoadMeshAttribute(mesh, attribute.Key, attribute.Value);
}
LoadMeshAttribute(mesh, "INDEX", primitive.Indices.GetValueOrDefault());
return(mesh);
}
private void LoadMeshAttribute(GltfMesh mesh, string attributeName, int accessorIndex)
{
var arr = accessorLoader.LoadAccessor(accessorIndex);
switch (attributeName)
{
case "POSITION":
{
var vertices = (Vector3[])arr;
CoordinateSystemConverter.Convert(vertices);
mesh.vertices = vertices;
break;
}
case "NORMAL":
{
var normals = (Vector3[])arr;
CoordinateSystemConverter.Convert(normals);
mesh.normals = normals;
break;
}
case "TANGENT":
{
var tangents = (Vector4[])arr;
CoordinateSystemConverter.Convert(tangents);
mesh.tangents = tangents;
break;
}
case "TEXCOORD_0":
{
var texCoords = (Vector2[])arr;
CoordinateSystemConverter.FlipTexCoords(texCoords);
mesh.texCoords = texCoords;
break;
}
case "COLOR_0":
{
var colors = (Vector4[])arr;
mesh.colors = TypeConverter.ConvertColors(colors);
break;
}
case "INDEX":
{
var indices = new int[arr.Length];
for (int i = 0; i < arr.Length; i++)
{
indices[i] = Convert.ToInt32(arr.GetValue(i));
}
CoordinateSystemConverter.FlipIndices(indices);
mesh.indices = indices;
break;
}
case "JOINTS_0":
mesh.joints = (Vector4[])arr;
break;
case "WEIGHTS_0":
mesh.weights = (Vector4[])arr;
break;
default:
Debug.LogWarning($"Invalid accessor name ({attributeName})");
break;
}
}