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Firstly, I imported a ply mesh to Blender 3.3.0 and colored it by attribute. I selected place in edit mode, where I wanted to draw the texture and created Smart UV Project. enter image description here Then, I followed by many tutorials and blocked in one moment. I try to draw a texture in stencil mode but it doesn't work in Texture paint interaction mode, but it works on the paint mode.

It's my settings

enter image description here enter image description here

Final effect

enter image description here

Link to blender project: https://we.tl/t-YinVxn7WUf

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  • $\begingroup$ I guess this question is a duplicate. The problem is that you're trying to paint on the backface which doesn't work. If you turn on the Face Orientation overlay (blender.stackexchange.com/a/216140/107598) you will see most of the inside of the room is red. Red=back side, blue=front side. Your 3D scanned(?) mesh is very heavy and I don't know if you can flip the faces easily (there are so many). So it might be easier to just mirror the texture. Set Brush > Texture > Size X to -1 in the Brush/Tool settings. Then paint it from the outside on the wall. $\endgroup$
    – Blunder
    Nov 28, 2022 at 11:52
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    $\begingroup$ It works <3 Thanks a lot @Blunder $\endgroup$ Nov 29, 2022 at 10:58

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I guess this question is a duplicate. The problem is that you're trying to paint on the backface which doesn't work. If you turn on the Face Orientation overlay (display face normal direction in blender 2.8) you will see most of the inside of the room is red. Red=back side, blue=front side. Your 3D scanned(?) mesh is very heavy and I don't know if you can flip the faces easily (there are so many). So it might be easier to just mirror the texture. Set Brush > Texture > Size X to $-1$ in the Brush/Tool settings. Then paint it from the outside on the wall. – Blunder

In addition, if someone wants to change orientation, you must be in Edit mode > Mesh > Normals (shortcut: Alt+N) > Flip.

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