public static MeshGroup FromGltf(this VrmProtobuf.Mesh x,
Vrm10Storage storage, List <Material> materials)
{
var group = new MeshGroup(x.Name);
if (x.Primitives.Count == 1)
{
var primitive = x.Primitives[0];
var mesh = primitive.FromGltf(storage, x);
var materialIndex = primitive.Material.HasValue ? primitive.Material.Value : 0;
mesh.Submeshes.Add(
new Submesh(0, mesh.IndexBuffer.Count, materials[materialIndex]));
group.Meshes.Add(mesh);
}
else if (!x.AllPrimitivesHasSameVertexBuffer())
{
int offset = 0;
foreach (var primitive in x.Primitives)
{
var mesh = primitive.FromGltf(storage, x);
var materialIndex = primitive.Material.HasValue ? primitive.Material.Value : 0;
mesh.Submeshes.Add(
new Submesh(offset, mesh.IndexBuffer.Count, materials[materialIndex]));
offset += mesh.IndexBuffer.Count;
group.Meshes.Add(mesh);
}
}
else
{
// for VRM
var mesh = x.SharedBufferFromGltf(storage);
int offset = 0;
foreach (var primitive in x.Primitives)
{
var materialIndex = primitive.Material.HasValue ? primitive.Material.Value : 0;
var count = storage.Gltf.Accessors[primitive.Indices.Value].Count.Value;
mesh.Submeshes.Add(
new Submesh(offset, count, materials[materialIndex]));
offset += count;
}
group.Meshes.Add(mesh);
}
return(group);
}
static Mesh FromGltf(Vrm10Storage storage, VrmProtobuf.Mesh x, VrmProtobuf.MeshPrimitive primitive, bool isShared)
{
var mesh = new Mesh((TopologyType)primitive.Mode.GetValueOrDefault())
{
VertexBuffer = primitive.Attributes.FromGltf(storage)
};
if (isShared)
{
// create joined index buffer
mesh.IndexBuffer = storage.CreateAccessor(x.Primitives.Select(y => y.Indices.Value).ToArray());
}
else
{
mesh.IndexBuffer = storage.CreateAccessor(primitive.Indices.Value);
}
{
for (int i = 0; i < primitive.Targets.Count; ++i)
{
var gltfTarget = primitive.Targets[i];
string targetName = null;
if (primitive.Extras != null &&
primitive.Extras.TargetNames != null &&
i < primitive.Extras.TargetNames.Count
)
{
targetName = primitive.Extras.TargetNames[i];
}
var target = new MorphTarget(targetName)
{
VertexBuffer = gltfTarget.FromGltf(storage)
};
// validate count
foreach (var kv in target.VertexBuffer)
{
if (kv.Value.Count != mesh.VertexBuffer.Count)
{
throw new Exception();
}
}
mesh.MorphTargets.Add(target);
}
}
return(mesh);
}
public static VrmProtobuf.Mesh ExportMeshGroup(this MeshGroup src, List <Material> materials, Vrm10Storage storage, ExportArgs option)
{
var mesh = new VrmProtobuf.Mesh
{
Name = src.Name
};
foreach (var x in src.Meshes)
{
// MeshとSubmeshがGltfのPrimitiveに相当する？
x.ExportMesh(materials, storage, mesh, option);
}
return(mesh);
}
public static bool AllPrimitivesHasSameVertexBuffer(this VrmProtobuf.Mesh m)
{
if (m.Primitives.Count <= 1)
{
return(true);
}
var first = m.Primitives[0];
for (int i = 1; i < m.Primitives.Count; ++i)
{
if (!first.HasSameVertexBuffer(m.Primitives[i]))
{
return(false);
}
}
return(true);
}
/// <summary>
/// IndexBuffer毎に異なるVertexBufferを参照する
///
/// VertexBuffer
/// +--------+ +--------+ +--------+
/// |0 | |1 | |2 |
/// +--------+ +--------+ +--------+
/// A A A
/// | | |
/// +---------+--------+--------+
/// | submesh0|submesh1|submesh2|
/// +---------+--------+--------+
/// IndexBuffer
/// </summary>
public static Mesh FromGltf(this VrmProtobuf.MeshPrimitive primitive, Vrm10Storage storage, VrmProtobuf.Mesh x)
{
return(FromGltf(storage, x, primitive, false));
}
/// <summary>
/// VertexBufferはひとつでIndexBufferの参照が異なる
///
/// VertexBuffer
/// +----------------------------------+
/// | |
/// +----------------------------------+
/// A A A
/// | | |
/// +---------+--------+--------+
/// | submesh0|submesh1|submesh2|
/// +---------+--------+--------+
/// IndexBuffer
/// </summary>
public static Mesh SharedBufferFromGltf(this VrmProtobuf.Mesh x, Vrm10Storage storage)
{
// 先頭を使う
return(FromGltf(storage, x, x.Primitives[0], true));
}
static void ExportMesh(this Mesh mesh, List <Material> materials, Vrm10Storage storage, VrmProtobuf.Mesh gltfMesh, ExportArgs option)
{
//
// primitive share vertex buffer
//
var attributeAccessorIndexMap = mesh.VertexBuffer
.ToDictionary(
kv => kv.Key,
kv => kv.Value.AddAccessorTo(
storage, 0, option.sparse,
kv.Key == VertexBuffer.PositionKey ? (Action <Memory <byte>, VrmProtobuf.Accessor>)Vec3MinMax : null
)
);
List <Dictionary <string, int> > morphTargetAccessorIndexMapList = null;
if (mesh.MorphTargets.Any())
{
morphTargetAccessorIndexMapList = new List <Dictionary <string, int> >();
foreach (var morphTarget in mesh.MorphTargets)
{
var dict = new Dictionary <string, int>();
foreach (var kv in morphTarget.VertexBuffer)
{
if (option.removeTangent && kv.Key == VertexBuffer.TangentKey)
{
// remove tangent
continue;
}
if (option.removeMorphNormal && kv.Key == VertexBuffer.NormalKey)
{
// normal normal
continue;
}
if (kv.Value.Count != mesh.VertexBuffer.Count)
{
throw new Exception("inavlid data");
}
var accessorIndex = kv.Value.AddAccessorTo(storage, 0,
option.sparse,
kv.Key == VertexBuffer.PositionKey ? (Action <Memory <byte>, VrmProtobuf.Accessor>)Vec3MinMax : null);
dict.Add(kv.Key, accessorIndex);
}
morphTargetAccessorIndexMapList.Add(dict);
}
}
var drawCountOffset = 0;
foreach (var y in mesh.Submeshes)
{
// index
// slide index buffer accessor
var indicesAccessorIndex = ExportIndices(storage, mesh.IndexBuffer, drawCountOffset, y.DrawCount, option);
drawCountOffset += y.DrawCount;
var prim = new VrmProtobuf.MeshPrimitive
{
Mode = (int)mesh.Topology,
Material = materials.IndexOfNullable(y.Material),
Indices = indicesAccessorIndex,
};
gltfMesh.Primitives.Add(prim);
// attribute
foreach (var kv in mesh.VertexBuffer)
{
var attributeAccessorIndex = attributeAccessorIndexMap[kv.Key];
prim.Attributes.Add(kv.Key, attributeAccessorIndex);
}
// morph target
if (mesh.MorphTargets.Any())
{
foreach (var(t, accessorIndexMap) in
Enumerable.Zip(mesh.MorphTargets, morphTargetAccessorIndexMapList, (t, v) => (t, v)))
{
var target = new VrmProtobuf.target();
prim.Targets.Add(target);
foreach (var kv in t.VertexBuffer)
{
if (!accessorIndexMap.TryGetValue(kv.Key, out int targetAccessorIndex))
{
continue;
}
switch (kv.Key)
{
case VertexBuffer.PositionKey:
target.POSITION = targetAccessorIndex;
break;
case VertexBuffer.NormalKey:
target.NORMAL = targetAccessorIndex;
break;
case VertexBuffer.TangentKey:
target.TANGENT = targetAccessorIndex;
break;
default:
throw new NotImplementedException();
}
}
}
if (mesh.MorphTargets.Any())
{
prim.Extras = new VrmProtobuf.MeshPrimitive.Types.Extras();
foreach (var name in mesh.MorphTargets.Select(z => z.Name))
{
prim.Extras.TargetNames.Add(name);
}
}
}
}
}