static void ReverseVector3Array(GltfData data, int accessorIndex, HashSet <int> used)
{
if (accessorIndex == -1)
{
return;
}
if (!used.Add(accessorIndex))
{
return;
}
var accessor = data.GLTF.accessors[accessorIndex];
var bufferViewIndex = -1;
if (accessor.bufferView != -1)
{
bufferViewIndex = accessor.bufferView;
}
else if (accessor.sparse?.values != null && accessor.sparse.values.bufferView != -1)
{
bufferViewIndex = accessor.sparse.values.bufferView;
}
if (bufferViewIndex != -1)
{
var buffer = data.GetBytesFromBufferView(bufferViewIndex);
var span = buffer.Reinterpret <UnityEngine.Vector3>(1);
for (int i = 0; i < span.Length; ++i)
{
span[i] = span[i].RotateY180();
}
}
}
/// <summary>
/// シーンをY軸で180度回転する
/// </summary>
/// <param name="gltf"></param>
public static void Rotate(GltfData data)
{
foreach (var node in data.GLTF.nodes)
{
Rotate(node);
}
// mesh の回転のみでよい
var used = new HashSet <int>();
foreach (var mesh in data.GLTF.meshes)
{
foreach (var prim in mesh.primitives)
{
ReverseVector3Array(data, prim.attributes.POSITION, used);
ReverseVector3Array(data, prim.attributes.NORMAL, used);
foreach (var target in prim.targets)
{
ReverseVector3Array(data, target.POSITION, used);
ReverseVector3Array(data, target.NORMAL, used);
}
}
}
foreach (var skin in data.GLTF.skins)
{
if (used.Add(skin.inverseBindMatrices))
{
var accessor = data.GLTF.accessors[skin.inverseBindMatrices];
var buffer = data.GetBytesFromBufferView(accessor.bufferView);
var span = buffer.Reinterpret <UnityEngine.Matrix4x4>(1);
for (int i = 0; i < span.Length; ++i)
{
span[i] = span[i].RotateY180();
}
}
}
}