Certain building models i upload create massive blotches of shadow,
Happens with this model every time
I would have hoped shadowmap would have helped make this not be an issue, but that doesn’t seem to be the case 
file: building to hecc.rbxl (31.4 KB)
Are global shadows on and do you want them on?
This has happened to me before. I had to create a new place and put what I had made there. Let me know if that works.
I figured out your problem, your ambient is to dark so you need to make it closer to a white color, by doing this go into the lighting properties by clicking lighting, then find the Ambient and change it to a brighter color.
That did work, i had to turn the ambient way up past half. really changes the look of things :T
It’d still be better to have this fixed than have to work around a big though
Please do not mark a solution on bug threads unless the actual bug is fixed. Marking a workaround as solution may lead to this thread being overlooked in the future.
I feel like this may be a regression that was introduced recently.
Unions & MeshParts that had giant black splotches on them with Legacy didn’t have that problem with Voxel, ShadowMap, or Compatibility until recently.
Yeah I am pretty sure some update screwed it up or something
