Comparison of simulation parameters for Radiance

The images below provide a side-by-side comparison of the primary rendering parameters used for ambient calculations for matrix-based methods. While the images below were generated using an image-based Daylight Coefficients simulation (i.e. a Two-Phase Method), the inferences made from these images are broadly applicable to all types of matrix-based simulations in the Three-Phase and Four-Phase Method as well.

Parameters comparable: Ambient bounces (-ab), Ambient Divisions (-ad), Sampling (-c).

Rationale for comparing two models ("Room1" and" Room2"): "Room1": is a simple model for a space that contains a single south-facing window. "Room2" is larger and more complex as it contains contextual geometry, multiple windows and furniture. Therefore, the parameters required for convergence of results in the case of "Room2" will be greater, and thus require more computational effort.
Hint: Try setting -ab as 4, -ad as 2000 and -c as 1 and then compare both the images and the simulation runtime.