Thanks janbo.
The model is made of 3d planes.
They take their textures in a splitted texture made of 256 tiles.
Some of them are all white (because they are not made for now), and this white appears here.
If i paint this white in black, i no more have this problem on some computers.
But in some others, i get black pixels or lines.
I've tested this with AppGameKit Studio, and it works perfectly on Vulkan renderer.
With OpenGL, it bugs.
I will try to talk to the Crocotile 3D community, to see how to use padding around tiles. (I don't know if this function is fully implemented)
Emotional High Potential