Strange shadows since update

I just did an update to Rhino 8 today, and re-opened the drawing I was working on, I instantly noticed that some polysurfaces have a black shadow on them, but it’s strange that it’s not all of them, I can change the color of that one group and those have the shadow, but others don’t. Does anyone know what’s going on here? The group with the dark shadows is nearly identical to the groups above and even when I make it the same color, that one group has dark shadows. This is something the update did, it was not like this before the update. Is this some new feature I can turn off? I can’t find any difference at all between objects that turn black like this and the ones that do not.


Dark Shadows.3dm (1.3 MB)

I just figured out that it’s something with it being in a block, because if I explode the block, my objects are the correct color, if I then make a new block, they are still the correct color… but I can’t go an explode and remake all my blocks, there are thousands of them and they are many copies in different orientations, and blocks nested in blocks many layers deep. I would have to reconstruct my entire project if I have to explode and re-make all my blocks… that would take literally weeks. It would be better to find out why the latest update is breaking things and fix it.

Hi James, I believe this is the same issue, i’ve added your example as well.

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Hi @Japhy Thank you for pointing me to the other thread, which contains a solution for it!

I’ll just post it here as well in case someone else comes across this and wants to know how it was resolved.

In Properties > Shaded > Lighting Scheme: Turning on “Use Advanced GPU Lighting” does solve the problem for me. It’s interesting that when I opened this, it was set to Custom lighting, but I have never defined any custom lighting, changing it do something other than custom has interesting results.

Here it is before:

Here it is after:

It’s odd that some blocks are affected, and other blocks are not affected, but I’m really glad that just changing a setting fixes the issue!

This will be fixed in 8.18 src coming up soon as well. Thanks for reporting!

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Here’s a quick update:
If I save my drawing and close Rhino, when I open it, all my blocks are dark again. If I go back to the settings, I see they are still set to Scene Lighting, and the checkmark is still in Use Advanced GPU Lighting… If I fiddle around with the settings and change to some other lighting modes, then go back to Scene Lighting, it gets fixed for some reason, but only while it’s open. When I close Rhino and go back again, all the blocks are dark. I’m not sure if it’s just “Scene Lighting” that does this, but I thought I would report it.

RH-86448 is fixed in Rhino 8 Service Release 18 Release Candidate