Getting all textCoords where objects collide

Hi All,

I am trying to alter a quad with a texture by using SetPixels. It works fine, but what I want to do now is at the start of a scene to make the pixels that an object touches black. I have no idea on how to do this.

I have tried using SphereCast, OverlapSphere etc, but these only give me one collider or one contact point. Is there a way to get all the texture coordinates by casting?

In short: I have a quad with a white texture. I want to paint part of it black by firing a sphere at it at the start of the scene. I want to use SetPixels for this.

 

Just create the appropriate sprite. Add it to your atlas. Adjust the pixels, uv's accordingly. Just as you were before. You said you could use setPixels. Why not again?

 

If it's a sphere collider then can it be as simple as getting all the pixels in a radius around the contact point? Or are you looking for something more robust than that?

 

How do I know how many pixels wide the sphere is?

 

If you know how big the radius is then you can add the radius to the world space position of the center of the collider and WorldToScreenPoint that new position.

Alternately - add the radius to the center and raycast against your target from that new position.