I've just wasted a whole day trying to set up stamp vertex alpha billboard branches for 3D trees. And yes, I have followed the documentation, the tutorials, the forums, the cheat sheet: vertex bottom line 1 > 2 triangulation from top left to bottom right vertex alpha set to 99.99 gmt exporter > screen aligned tools > ticked or "STMP" and center alignment Bump Spec Map T1 Stamp Vertex Vertex Color to be set to *a* value – even (255,255,255) reset xform The objects do work - to an extent. The extent is that there can be no more than 16 alpha screen-aligned-quads in a single gmt object. If this number is exceeded, this happens: This is just a simple object with 48 multiplied polys. About 30% of the planes are not rotating, and several are rotated or skewed in strange ways. Of course all the planes have same shader, triangulation and vertex numbering and values. They are copies. The moment the poly count is reduced to 16 polys (32 triangles) by deleting RANDOM elements, they all magically start working properly. Yes, you can literally delete all the polys that do work good, and the rest (for example the middle section in the lower pic) will begin to work right without any further changes ;( In the April update https://www.studio-397.com/2018/04/release-of-build-1110/ it is stated that the x64 plugins are used by the 397 team... so how about changing the BETA status of the x64 plugins to "production"?