Splatterfield

To create nice looking splats, like in Splatoon, you need to know where the paint is in 3 dimensions., otherwise if paint is splattered onto a wall object, and there is a floor object right beneath it hat is in splatting range, only the wall will get paint on it.

 

So to do this I created a shader graph in HDRP that takes a 3D texture mask the size of the level. When a splat occurs, the world position is converted into the 3D texture mask's pixel position (with randomness  so its not just a square blob) by script , with the player that shot it's assigned colour, eg (1, 0, 0, 0) for player 1 (RED), and (0, 1, 0, 1) for player 2 (GREEN) . Realisticly this can be any RGB to create thousands of teams. The Textured 3D mask is then updated and the shader graph does the rest.

 

Where the 3D texture mask is GREEN it will lerp to player 2's paint colour will now be visable (with noise to make it look splatty) on the shot object/s. Where it isn't GREEN it will lerp to be player 1's paint colour.

 

So now everywhere without player 2's paint colour will be player 1's colour, not the original texture. To fix this I then do a lerp another lerp. Where the Texture 3D mask has alpha (RED or GREEN) paint the paint texture, where it isn't keep it as the original texture.