Mitsuba renderer built-in BSDF samples

For study purposes, I was trying out the Mitsuba renderer. The first of the following renders shows the result from a "path" integrator, and the second from a "bdpt" integrator (which appears to has higher noise then the former) with spp of 64 and max path trace depth of 7.

The BSDF types are (from left to right) "diffue", "roughdiffuse", "dielectric", "roughdielectric", "conductor", "roughconductor", "plastic", "roughplastic".