Blender cycles texture flickering issue when rendering unique simple solid I'm trying to create a simple animation in cycles where a simple glass tetrahedron is lit by a lamp spin on it's Z axis. The tetrahedron was generated using the &quot;add mesh: extra objects&quot; add on. It is made of glass by assigning it's transmission to 0.8
Everything looks as I want when I render single images, but when I render it as an animation the surface of the tetrahedron is flickering in a random way. Any ideas on what to do to fix this ?
These are the only things I have in my scene, all the rest has been purged. Also, this only seems to be a problem for a &quot;glass&quot; material, as this doesn't happen with a metal material
You have a double surface issue. you made the object in edit mode I presume. and 2 times!
ALWAYS check for face orientations:

quick fix:
on edit mode, select all with A then press M and merge distance.
and recalculate your normal after that:
https://docs.blender.org/manual/en/latest/modeling/meshes/editing/mesh/normals.html#recalculate