Hello. On one of the renders out to me something like the attached picture - I used the appearance of the RED LED. How to fix it? What causes this?
The unexpected results you are experiencing, although very cool, is the result of the Displacement mapping option enabled for that specific appearance.
If you just want a red light, create a new appearance, make it an Emissive type and then adjust the color accordingly.
Here is what this Red LED appearance looks like, which because of the Displacement mapping, alters the geometry of the part where it is applied:
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