/// <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>
private void ImportMeshSharingVertexBuffer(GltfData data, glTFMesh gltfMesh, IAxisInverter inverter)
{
var isOldVersion = data.GLTF.IsGeneratedUniGLTFAndOlder(1, 16);
{
// 同じVertexBufferを共有しているので先頭のモノを使う
var primitives = gltfMesh.primitives.First();
var positions = primitives.GetPositions(data);
var normals = primitives.GetNormals(data, positions.Length);
var texCoords0 = primitives.GetTexCoords0(data, positions.Length);
var texCoords1 = primitives.GetTexCoords1(data, positions.Length);
var colors = primitives.GetColors(data, positions.Length);
var skinning = SkinningInfo.Create(data, gltfMesh, primitives);
AssignBoneWeight = skinning.ShouldSetRendererNodeAsBone;
CheckAttributeUsages(primitives);
for (var i = 0; i < positions.Length; ++i)
{
var position = inverter.InvertVector3(positions[i]);
var normal = normals != null?inverter.InvertVector3(normals.Value[i]) : Vector3.zero;
var texCoord0 = Vector2.zero;
if (texCoords0 != null)
{
if (isOldVersion)
{
#pragma warning disable 0612
texCoord0 = texCoords0.Value[i].ReverseY();
#pragma warning restore 0612
}
else
{
texCoord0 = texCoords0.Value[i].ReverseUV();
}
}
var texCoord1 = texCoords1 != null ? texCoords1.Value[i].ReverseUV() : Vector2.zero;
var color = colors != null ? colors.Value[i] : Color.white;
AddVertex(
new MeshVertex(
position,
normal,
texCoord0,
texCoord1,
color));
var skin =
skinning.GetSkinnedVertex(i);
if (skin.HasValue)
{
AddSkin(skin.Value);
}
}
// blendshape
if (primitives.targets != null && primitives.targets.Count > 0)
{
for (int i = 0; i < primitives.targets.Count; ++i)
{
var primTarget = primitives.targets[i];
var hasPosition = primTarget.POSITION != -1 && data.GLTF.accessors[primTarget.POSITION].count == positions.Length;
var hasNormal = primTarget.NORMAL != -1 && data.GLTF.accessors[primTarget.NORMAL].count == positions.Length;
var hasTangent = primTarget.TANGENT != -1 && data.GLTF.accessors[primTarget.TANGENT].count == positions.Length;
var blendShape = new BlendShape(i.ToString(), positions.Length, hasPosition, hasNormal, hasTangent);
_blendShapes.Add(blendShape);
if (hasPosition)
{
var morphPositions = data.GetArrayFromAccessor <Vector3>(primTarget.POSITION);
blendShape.Positions.Capacity = morphPositions.Length;
for (var j = 0; j < positions.Length; ++j)
{
blendShape.Positions.Add(inverter.InvertVector3(morphPositions[j]));
}
}
if (hasNormal)
{
var morphNormals = data.GetArrayFromAccessor <Vector3>(primTarget.NORMAL);
blendShape.Normals.Capacity = morphNormals.Length;
for (var j = 0; j < positions.Length; ++j)
{
blendShape.Normals.Add(inverter.InvertVector3(morphNormals[j]));
}
}
if (hasTangent)
{
var morphTangents = data.GetArrayFromAccessor <Vector3>(primTarget.TANGENT);
blendShape.Tangents.Capacity = morphTangents.Length;
for (var j = 0; j < positions.Length; ++j)
{
blendShape.Tangents.Add(inverter.InvertVector3(morphTangents[j]));
}
}
}
}
}
foreach (var primitive in gltfMesh.primitives)
{
if (primitive.indices >= 0)
{
var indexOffset = _currentIndexCount;
var indices = data.GetIndicesFromAccessorIndex(primitive.indices);
PushIndices(indices, 0);
_subMeshes.Add(new SubMeshDescriptor(indexOffset, indices.Count));
}
else
{
var indexOffset = _currentIndexCount;
var positions = data.GLTF.accessors[primitive.attributes.POSITION];
for (int i = 0; i < positions.count; i += 3)
{
// flip triangle
AddIndex(i + 2);
AddIndex(i + 1);
AddIndex(i);
}
_subMeshes.Add(new SubMeshDescriptor(indexOffset, positions.count));
}
// material
_materialIndices.Add(primitive.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>
private void ImportMeshIndependentVertexBuffer(GltfData data, glTFMesh gltfMesh, IAxisInverter inverter)
{
bool isOldVersion = data.GLTF.IsGeneratedUniGLTFAndOlder(1, 16);
foreach (var primitives in gltfMesh.primitives)
{
var vertexOffset = _currentVertexCount;
var indexBufferCount = primitives.indices;
// position は必ずある
var positions = primitives.GetPositions(data);
var normals = primitives.GetNormals(data, positions.Length);
var texCoords0 = primitives.GetTexCoords0(data, positions.Length);
var texCoords1 = primitives.GetTexCoords1(data, positions.Length);
var colors = primitives.GetColors(data, positions.Length);
var skinning = SkinningInfo.Create(data, gltfMesh, primitives);
AssignBoneWeight = skinning.ShouldSetRendererNodeAsBone;
CheckAttributeUsages(primitives);
for (var i = 0; i < positions.Length; ++i)
{
var position = inverter.InvertVector3(positions[i]);
var normal = normals != null?inverter.InvertVector3(normals.Value[i]) : Vector3.zero;
var texCoord0 = Vector2.zero;
if (texCoords0 != null)
{
if (isOldVersion)
{
#pragma warning disable 0612
// backward compatibility
texCoord0 = texCoords0.Value[i].ReverseY();
#pragma warning restore 0612
}
else
{
texCoord0 = texCoords0.Value[i].ReverseUV();
}
}
var texCoord1 = texCoords1 != null ? texCoords1.Value[i].ReverseUV() : Vector2.zero;
var color = colors != null ? colors.Value[i] : Color.white;
AddVertex(
new MeshVertex(
position,
normal,
texCoord0,
texCoord1,
color
));
var skin = skinning.GetSkinnedVertex(i);
if (skin.HasValue)
{
AddSkin(skin.Value);
}
}
// blendshape
if (primitives.targets != null && primitives.targets.Count > 0)
{
for (var i = 0; i < primitives.targets.Count; ++i)
{
var primTarget = primitives.targets[i];
var blendShape = GetOrCreateBlendShape(i);
if (primTarget.POSITION != -1)
{
var array = data.GetArrayFromAccessor <Vector3>(primTarget.POSITION);
if (array.Length != positions.Length)
{
throw new Exception("different length");
}
blendShape.Positions.AddRange(array.Select(inverter.InvertVector3).ToArray());
}
if (primTarget.NORMAL != -1)
{
var array = data.GetArrayFromAccessor <Vector3>(primTarget.NORMAL);
if (array.Length != positions.Length)
{
throw new Exception("different length");
}
blendShape.Normals.AddRange(array.Select(inverter.InvertVector3).ToArray());
}
if (primTarget.TANGENT != -1)
{
var array = data.GetArrayFromAccessor <Vector3>(primTarget.TANGENT);
if (array.Length != positions.Length)
{
throw new Exception("different length");
}
blendShape.Tangents.AddRange(array.Select(inverter.InvertVector3).ToArray());
}
}
}
if (indexBufferCount >= 0)
{
var indexOffset = _currentIndexCount;
var dataIndices = data.GetIndicesFromAccessorIndex(indexBufferCount);
PushIndices(dataIndices, vertexOffset);
_subMeshes.Add(new SubMeshDescriptor(indexOffset, dataIndices.Count));
}
else
{
var indexOffset = _currentIndexCount;
for (int i = 0; i < positions.Count(); i += 3)
{
// flip triangle
AddIndex(i + vertexOffset + 2);
AddIndex(i + vertexOffset + 1);
AddIndex(i + vertexOffset);
}
_subMeshes.Add(new SubMeshDescriptor(indexOffset, positions.Count()));
}
// material
_materialIndices.Add(primitives.material);
}
}