This assignment involves experimenting with the Raytracing and Radiosity features embedded in the BMRT package. These functions give you the capability to model ray tracing in Renderman. For example, setting average color for an object or changing the patch size.
Soft lighting can come from a diffuse light source such as a window or just indirect ambient light.
For those working on the Cezanne fruit example, you will want to experiment with getting the colors of the fruit to reflect on lighter surfaces. Hand in paper copies as well as electronically submit the material.