Hi Niebo
-1st step : you have to work 1-2h on your item in the meshmoddleur with the 'painting' tool without closing it or moving to another icon.
-2nd step, the game always crashes when there is a visual bug that applies the paint in + of the area you have selected.
Ex: on the video , when I choose the 2 squares as example and that I apply the texture , there is a visual bug which applies on the 2 squares + the 2 structure. when this bug this product and that you clicked on the "custom uv mod" it crashes directly.
***before applying the selection for light only ( in the video I do not select the pillars of the lamp)

***after applying the selection for the light :
(you see it selects the 2 rods in + of the rest while I had not selected them before)
1st remake :
(I noticed that this crash happens only when it's about texture where you can have the possibility of "custom uv mod" all the textures without it works perfectly and I don't have any game crashes.)
2nd :
( it is necessary to have this visual bug for it to crash and it happens after several hours of work on the mesh moddler )
I also noticed that for this crash to happen it is necessary to select a lot of selection surface of an item or object by applying only one material (materials with a uv custom mode).
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I managed to get this problem on top of the same item in a reproducible way with this item:
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Other video for the game crash :
https://streamable.com/aftz96
(in the video I try with average and maximum visual parameters
I didn't get a crash log after these game crashes )
----I managed to reproduce this bug with my item : "garage1close.gbx" that you can download here :
EX of item that crashes the game :
https://item.mania.exchange/set/view/10469
----The other garages not this problem however I did not modify anything on the others:
Tuto for game crash : tried like in the crash video:
- paint tools:
- selected all the faces of the main light on the roof
- apply the "light" texture
- click on "custom uv mode".
The game is going to crash.
Edit+ : I've noticed that for the front grind the color changes for all my garages I've made :
tried to do like in video number one by selecting only the first 2 yellow lights in front of the garage and you'll have the same problem as me + a crash of the game.
it's not the first time it happens to me on items I create or modify.
please tell me if this crashes for you and try to find the cause of the problem + a fix?
I suspect may be the selection zones that breaks between it and the 3d object that breaks the game.
thx you very much
