I am having an issue with the pathtracer rendering engine in Flamingo causing visual artifacts (speckles, I’ve also seen them called “fireflies”) when paired with specific HDRI’s. In particular, HDRI’s with a very bright light source, such as an unobscured solar disk cause this issue, while HDRI’s with the sun behind clouds are free from these artifacts. This issue does not appear to be resolved readily by increasing the number of passes. Attached is an image with the speckles has been allowed to run for 1025 passes.
Note the red speckles scattered throughout the water in the reflection.
This issue is not present in the default render engine, but I cannot reasonably use that engine for the real render I am trying to produce because it completes about 1 pass every 8 or so hours. Using the pathtracer, I was able to get quite decent high-resolution images after an overnight rendering (approx 12 hours).
Toward this end, I was wondering:
Has anyone experienced this problem before?
Are there any recommendations to resolve the problem that do not involve modifying the HDR itself?
I cannot post even the sample model file because it would count as “redistributing the HDR’s”, since all could download it from here. Would not object to emailing it to a rhino/flamingo rep.
Using Flamingo Build 6-Jan-2017, Rhino V5 SR13 13/09/2016.
Thanks in advance for the help, apologies for the length.