Got another weird issue related to the cubic mapping question I asked before. I have an texture with a color map, and a bump map. I applied this to the object in C4d using cubic mapping, and then created cubic UVW coordinates for the texture, which converted it to UVW mapping. This works perfectly in Cinema 4D's renderer, but produces some unpredictable behavior in LuxRender. On some surfaces, the bump comes out backwards (I've checked that the surface normals are all facing the correct direction. On all surfaces, the bump comes out very poorly. The image maps are 2048 x 2048 in size but it looks like Lux isn't using the full resolution.
Here are a couple of examples of what I am talking about:
C4D output (basic scanline render):http://planets.shacknet.nu/images/c4doutput.jpg
Lux output (looks crappy partly because I only let the render cook for 14 minutes):http://planets.shacknet.nu/images/luxoutput.jpg
Ignoring the other issues with the image you'll see the bump is facing the right way on the cubical object on the left, but is flipped on the rounded object on the right. Is there anything I can do to resolve these issues? I thought perhaps normal mapping would be more predictable but, alas, LuxRender doesn't support them yet.