Figure 4.

Summary of MaterialSphereBumps workflow. The top row shows key elements of the scene, from left to right: the parent scene 3-D model created in Blender; various sphere materials including red-looking matte, green-looking Ward material, and gold metal; and an image of the earth used as a bump map to alter the surface height of the sphere. The middle rows show a sRGB montage of renderings produced by PBRT. The bottom row shows a sRGB montage of renderings produced by Mitsuba. Both renderers support bump maps and produce renderings with surface height altered to resemble the earth image. However, the bumps appear taller in the PBRT rendering than they do in the Mitsuba rendering, indicating that the two renderers interpret bump maps differently.