// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#meshes
int ExportIndices(int[] indices)
{
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#primitiveindices
indices = CoordUtils.FlipIndices(indices).ToArray();
// Scalar | UNSIGNED_BYTE
// | UNSIGNED_SHORT
// | UNSIGNED_INT! (TODO: optimize kind...)
byte[] buffer = PrimitiveExporter.Marshal(indices);
var viewIndex = BufferBuilder.AddView(
new ArraySegment <byte>(buffer),
null,
Types.BufferView.TargetEnum.ELEMENT_ARRAY_BUFFER);
var viewComponentType = Types.Accessor.ComponentTypeEnum.UNSIGNED_INT;
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = viewComponentType,
Count = indices.Length,
Type = Types.Accessor.TypeEnum.Scalar,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
int ExportPositions(Vector3[] vec3, int[] indices = null)
{
Types.Accessor.ComponentTypeEnum viewComponentType;
var viewIndex = ExportPositionsBuffer(ref vec3, out viewComponentType);
var sparseIndexType = default(Types.Accessor.SparseType.IndicesType.ComponentTypeEnum);
int?sparseViewIndex = null;
if (indices != null)
{
Debug.Assert(indices.Length == vec3.Length);
sparseViewIndex = ExportSparseIndicesBuffer(ref indices, out sparseIndexType);
}
// position MUST have min/max
var min = new Vector3(float.MaxValue, float.MaxValue, float.MaxValue);
var max = new Vector3(float.MinValue, float.MinValue, float.MinValue);
foreach (var v in vec3)
{
min = new Vector3(Mathf.Min(v.x, min.x), Mathf.Min(v.y, min.y), Mathf.Min(v.z, min.z));
max = new Vector3(Mathf.Max(v.x, max.x), Mathf.Max(v.y, max.y), Mathf.Max(v.z, max.z));
}
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = viewComponentType,
Count = vec3.Length,
Type = Types.Accessor.TypeEnum.Vec3,
Min = new float[] { min.x, min.y, min.z },
Max = new float[] { max.x, max.y, max.z },
};
if (sparseViewIndex != null)
{
accessor.Sparse = new Types.Accessor.SparseType
{
Count = vec3.Length,
Indices = new Types.Accessor.SparseType.IndicesType
{
BufferView = sparseViewIndex.Value,
ByteOffset = 0,
ComponentType = sparseIndexType,
},
Values = new Types.Accessor.SparseType.ValuesType
{
BufferView = accessor.BufferView.Value,
ByteOffset = accessor.ByteOffset,
},
};
accessor.BufferView = null;
}
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skin
int ExportInverseBindMatrices(Matrix4x4[] matrices)
{
matrices = matrices.Select(CoordUtils.ConvertSpace).ToArray();
// MAT4! | FLOAT!
byte[] buffer = PrimitiveExporter.Marshal(matrices);
var viewIndex = BufferBuilder.AddView(new ArraySegment <byte>(buffer));
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = Types.Accessor.ComponentTypeEnum.FLOAT,
Count = matrices.Length,
Type = Types.Accessor.TypeEnum.Mat4,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
int ExportWeights(Vector4[] weights)
{
// VEC4! | FLOAT!
// | UNSIGNED_BYTE (normalized)
// | UNSIGNED_SHORT (normalized)
byte[] buffer = PrimitiveExporter.Marshal(weights);
var viewIndex = BufferBuilder.AddView(new ArraySegment <byte>(buffer));
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = Types.Accessor.ComponentTypeEnum.FLOAT,
Count = weights.Length,
Type = Types.Accessor.TypeEnum.Vec4,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
int ExportTangents(Vector4[] vec4)
{
vec4 = vec4.Select(CoordUtils.ConvertSpace).ToArray();
// VEC4! | FLOAT!
byte[] buffer = PrimitiveExporter.Marshal(vec4);
var viewIndex = BufferBuilder.AddView(new ArraySegment <byte>(buffer));
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = Types.Accessor.ComponentTypeEnum.FLOAT,
Count = vec4.Length,
Type = Types.Accessor.TypeEnum.Vec4,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
int ExportUV(Vector2[] uv)
{
uv = uv.Select(CoordUtils.ConvertUV).ToArray();
// VEC2! | FLOAT!
// | UNSIGNED_BYTE (normalized)
// | UNSIGNED_SHORT (normalized)
byte[] buffer = PrimitiveExporter.Marshal(uv);
var viewIndex = BufferBuilder.AddView(new ArraySegment <byte>(buffer));
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = Types.Accessor.ComponentTypeEnum.FLOAT,
Count = uv.Length,
Type = Types.Accessor.TypeEnum.Vec2,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
int ExportJoints(Vec4 <int>[] joints)
{
// VEC4! | UNSIGNED_BYTE
// | UNSIGNED_SHORT!
byte[] buffer = PrimitiveExporter.Marshal(
joints
.Select(v => new Vec4 <ushort>((ushort)v.x, (ushort)v.y, (ushort)v.z, (ushort)v.w))
.ToArray()
);
var viewIndex = BufferBuilder.AddView(new ArraySegment <byte>(buffer));
var accessor = new Types.Accessor
{
BufferView = viewIndex,
ByteOffset = 0,
ComponentType = Types.Accessor.ComponentTypeEnum.UNSIGNED_SHORT,
Count = joints.Length,
Type = Types.Accessor.TypeEnum.Vec4,
};
return(Types.GltfExtensions.AddAccessor(Gltf, accessor));
}
