[mrgoodcat]

Hi, I write because as you already know I have a problem with the collider. I state that I am not an expert unity. Basically I created the png images with some gaps, I would like to create a collider so that the object was going to "sbattare" only on the parties "draw." I try to explain in simple terms yet pù. I would create a single collider for the black parts (see picture). The image is created at random in a hurry but this is the concept? thank you.

[Ronan.]

I'm not totally sure what you're asking here, you also linked no image.
From what I gather, you have a 2D image with a few gaps in it, you want to run a linecast that returns true if it hits the part of the image without gaps?