Development Journal of a Raytracer

I have also started to look into the problems of rendering materials. I already know the problems which cause the problems labeled 1 to 3 in the image. The origin transform each of my objects has is not working correctly. In the image the front and back wall was the same object, so instancing has to be used in the raytracer and that applied the origin transformation twice. The origin transformation of that object turns the object 90° around the x-axis. So the grey stripe is actually the object, the darker area is the background color.

But the simple fix I just did doesn't work, due to a lot of common code it removed the origin transform for the objects which don't have to be instanced. I think I have a new candidate for my automatic tests. I will try to find out how to fix the problem.

Today I started to work on the internals of the Draw On Plane-modifier. I have deactivated the incremental updates for now to first get it working. It was quite easy to just use the Change Geometry I wrote some time ago. A lot of code is just no longer necessary and I can even add a feature I never got around to add before, splitting faces. It was not possible to integrate into the old code base, the new one only needs to be told to do it, it already is very much able to split faces. The short test I did revealed no big problems. The selection after the split step is wrong, but I don't know if it was working before. I might finish this in the next days.