To reduce aliasing effects, the Tachyon raytracer can perform supersampling by computing multiple rays per output pixel. This parameter controls the number of rays.

Enables the parallel light source, which is directed from an angle behind the camera.

Enables cast shadows for the directional light. Not that, with the current Tachyon version, you cannot turn off shadows when ambient occlusion shading is enabled. In this case, you can only turn off the directional light source completely.

Enabling this lighting technique mimicks some of the effects that occur under conditions of omnidirectional diffuse illumination, e.g. outdoors on an overcast day.

Ambient occlusion is implemented using a Monte Carlo technique. This parameters controls the number of samples to compute. A higher sample number leads to a more even shading, but requires more computation time.