Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It looks like the errors occur on the boundary between shaded and unshaded. The default for rcontrib is -dj 1 which sends a ray to a random location within the angle subtended by the sun, but you are probably comparing this to rays sent to the center of the sun. Using -dj 0 will hopefully bring the two into agreement.
