| Automatic raytracing
| If you pass "raytrace" as the texture name to environment and shadow shading language commands, PIXIE will raytrace to find the reflection (for environment) or the transmission (for shadow). You can pass "samples" to tell PIXIE how many rays it should cast. The "blur" argument can be used to blur the reflection or shadow. The figure below demonstrate the glossy reflection obtained by the environment shading language command.