OpenBVE supports most DirectX object file features, other than animations.
Color key transparencies in textures
For legacy reasons in BVE2, BVE4 and OpenBVE format routefiles (.csv and .rw), the color of pure black (0,0,0) is reserved when used in a texture. If a texture contains this color, then these pixels will be rendered as transparent.
Full support & documentation of the X object format is not available from this site, but the following is an overview of the supported templates, unstructured.
- Frame
- FrameRoot
- Mesh
- Vector
- MeshFace
- MeshMaterialList
- Material
- ColorRGBA
- ColorRGB
- TextureFilename
- MeshTextureCoords
- Coords2d
- MeshNormals
- MeshVertexColors
Please see https://paulbourke.net/dataformats/directx/ for a good overall reference to the file format.