Drawing on textures at runtime with GPU in UNITY

These scripts (and a shader) allows you to draw on textures at runtime with lightning-fast speed, unlike if you trying to do the same on CPU using GetPixels and SetPixels.

In action

Stable drawing at high FPS (1000+ on Nvidia GTX 1060). Same result, but using CPU to change texture runs at 10-15 FPS (trust me).

Also, there is an example with a "scratch" shader:

Usage

All essential scripts and shader lies under Scripts and Shaders folders. Brushes lies under Textures/brushes folder.

Scripts

• Put MouseDrawController.cs script on your camera, set brush texture, color and size in it
• Put DrawZone.cs script on mesh that you want to draw on

You can also inherit DrawZone.cs and create your own behaviour of script, example given in ScratchZone.cs

Brushes

Brushes are black/white images. White area draws, black doesnt.

Mesh requirements

You have to unwrap your mesh properly, so left bottom corner of mesh must be (0, 0) on UVs, and the top right corner of mesh must be (1, 1).

Just like this:

Conclusion

Thanks for your attention! I will be pleasured to see any feedback :)