Hello,
The attached model has a colour washout on the Brick28 material in Rhino 8 Mac. It is OK on Rhino 8 Windows. It was OK last time I opened the model, but there have been Rhino 8 Mac updates since then.
Regards, Garry.
HouseRemodel28Material.3dm (7.4 MB)
Windows…
Mac…
Sysinfo.txt (4.9 KB)
Thank you for your report. I’m seeing this issue as well, and I have logged it with our development engineers.
RH-91151 Material: Rhino 8 Mac Material Texture colour washout
@jessesn I have found the culprit. The Gamma value for the material is set to 1.00, which is correct. For some reason, the Gamma value appears to be ignored. By changing it from 1.00 to 0.5, the washout is resolved. A second change to set it back to 1.00 provides the desired appearance. It seems to require a different value to trick it to pay attention.
Regards, Garry.
@jessesn The work around worked in the test model, then in the full model, but now it is not working in the full model. It is still working in the test model.
Regards, Garry.
@jessesn I just noticed that Version 8 (8.30.26069.02002, 2026-03-10) fixes this bug, so I installed the update. It looks good, but I should mention that it has been working correctly for a few weeks now. It appears that it was a hit-and-miss gremlin which might have been partially overcome be earlier updates. Good to see that it has been ticked off the bug list.
Regards, Garry.
