Rendering Issue

When I render, part of the image comes out pixelated. How can I fix this issue?

I’d like to know if the material of this part use the bitmap texture? Are the texture mapping set appropriately? Could you share this 3dm file ? BTW, for large file, use cloud storage for sharing.

render new 2.3dm

Material used is paint (called “Th. Ext” in the material panel)

I noticed that the rendering issue you had before were due to some duplicate objects, hiding it should resolve the previous rendering issues. FYI,