I am doing some simple rendering with the default setup using mantra. No displacement maps etc - just a very simple test render with default materials. But I am getting strange black stripes on the rendering.

See attached image. Does anyone know what I am doing wrong.

Thanks…

I think I have figured it out. The issue was that my geometry was far from the origin. i.e. it was around 100,000 units away from the origin in both teh X and Y directions. The reason was that the data use originally came from some GIS data.

Moving the geometry to the origin solved the problems.

Cool, you have seen the structure of the matrix!