public static G3DBuilder AddUnityUV(this G3DBuilder gb, Vector2[] vectors, int index)
{
if (vectors?.Length == 0)
{
return(gb);
}
var data = vectors.Select(v => new Math3d.Vector2(v.x, v.y)).ToIArray();
var attrDescr = AttributeDescriptor.Parse(CommonAttributes.VertexUv).SetIndex(index);
return(gb.Add(new GeometryAttribute <Math3d.Vector2>(data, attrDescr)));
}
public static G3DBuilder AddUnityTangent(this G3DBuilder gb, Vector4[] tangents)
{
if (tangents?.Length == 0)
{
return(gb);
}
var data = tangents.Select(v => new Math3d.Vector4(v.x, v.y, v.z, v.w)).ToIArray();
var attrDescr = AttributeDescriptor.Parse(CommonAttributes.VertexTangent);
return(gb.Add(new GeometryAttribute <Math3d.Vector4>(data, attrDescr)));
}
public static G3DBuilder AddUnityNormals(this G3DBuilder gb, Vector3[] normals)
{
if (normals?.Length == 0)
{
return(gb);
}
var data = normals.Select(v => new Math3d.Vector3(v.x, v.y, v.z)).ToIArray();
var attrDescr = AttributeDescriptor.Parse(CommonAttributes.VertexNormal);
return(gb.Add(new GeometryAttribute <Math3d.Vector3>(data, attrDescr)));
}
public static G3DBuilder AddUnityColors(this G3DBuilder gb, Color[] colors)
{
if (colors?.Length == 0)
{
return(gb);
}
var data = colors.Select(c => new Math3d.Vector4(c.r, c.g, c.b, c.a)).ToIArray();
var attrDescr = AttributeDescriptor.Parse(CommonAttributes.VertexColor);
return(gb.Add(new GeometryAttribute <Math3d.Vector4>(data, attrDescr)));
}
public static G3DBuilder AddUnityVertices(this G3DBuilder gb, Vector3[] vectors)
{
if (vectors?.Length == 0)
{
return(gb);
}
var data = vectors.Select(v => new Math3d.Vector3(v.x, v.y, v.z)).ToIArray();
var attrDescr = AttributeDescriptor.Parse(CommonAttributes.Position);
return(gb.Add(new GeometryAttribute <Math3d.Vector3>(data, attrDescr)));
}
public static G3D ToG3D(this Mesh mesh)
{
var g = new G3DBuilder();
// NOTE: if the any of the UV channels are null, followed by a non-null channel, then the UV channels will get reindexed
// during reimport of the G3D. This would be quite rare.
var uvIndex = 0;
g.AddUnityUV(mesh.uv, uvIndex++);
g.AddUnityUV(mesh.uv2, uvIndex++);
g.AddUnityUV(mesh.uv3, uvIndex++);
g.AddUnityUV(mesh.uv4, uvIndex++);
g.AddUnityUV(mesh.uv5, uvIndex++);
g.AddUnityUV(mesh.uv6, uvIndex++);
g.AddUnityUV(mesh.uv7, uvIndex++);
g.AddUnityUV(mesh.uv8, uvIndex++);
g.AddUnityVertices(mesh.vertices);
g.AddUnityNormals(mesh.normals);
g.AddUnityTangent(mesh.tangents);
g.AddUnityColors(mesh.colors);
var indices = new List <int>();
var offsets = new List <int>();
var offset = 0;
for (var i = 0; i < mesh.subMeshCount; ++i)
{
offsets.Add(offset);
var subIndices = mesh.GetIndices(i);
indices.AddRange(subIndices);
offset += subIndices.Length;
}
g.AddIndices(indices.ToArray());
return(g.ToG3D());
}
