1
\$\begingroup\$

I want to create procedural paint splatters on textures. I want somewhat similar effect like in Splatoon 2.

I think I need to modify albedo image - drawing splatters there.

Right now I came up with drawing filled circles and processing them with gaussian blur. But it's far away from good looking splatter.

I want color of splatter to slightly change near the corners.

Also I will need to create the same image but for normal map, but I think it will be the same just with different colors (basically "repeat code with different colors"). I want splatter to have glossy-look like fresh paint.

Unfortunately I know almost zero useful algorithms that will help me with that.

My current level - I duckduckgoed (searched) algorithm for getting circle coordinates - here I draw those circles and then blur them out.

At first I thought it would be easy, but I stopped even at understanding how to draw a line (that's when I discovered Bresenham's line algorithm which helped me a lot).

I can't read math formulas so it will be much appreciated if there are algorithms with code examples (any language).

I also use 3 engines so I can test in one of the engines my approach with algorithms and then transfer it to another. Help with algorithms in gdscript/c++/c# is welcome!

P.S. I'm not looking for a ready-to-go solution like fully fletched library for such things or asset or something. I want to understand and learn.

Thanks!

\$\endgroup\$
7
  • 2
    \$\begingroup\$ How much area do you need to cover? If it's just a single object/surface then your idea of drawing into an albedo/normal texture directly should work. If you need to cover potentially every surface in an entire map — like in the case of Splatoon games (Or Portal 2 / Tag: the Power of Paint before them) then this will start to use an unsustainable amount of texture memory. Games like these instead store a lower resolution "coverage" map, and then in the shader they add fine pixel-scale blobby details to hide the much less granular underlying data. \$\endgroup\$ Commented Jun 30, 2021 at 13:23
  • \$\begingroup\$ @DMGregory for starters I want to draw a splatter on let's take 300x300 RGBA image. \$\endgroup\$ Commented Jun 30, 2021 at 13:25
  • 1
    \$\begingroup\$ "I can't read math formulas so it will be much appreciated if there are algorithms with code examples (any language)." -> "I'm not looking for a ready-to-go solution like fully fletched library for such things or asset or something. I want to understand and learn." Yet it's either one or the other. You either intend to learn math and algorithms, or you don't and then you need a fully fledged module to do the work for you. Which is it? Unlikely to find solutions to do something this specific, IMO. Looks like a fairly advanced (set of) algorithm(s) that Splatoon uses for splatting. \$\endgroup\$ Commented Jun 30, 2021 at 16:45
  • 1
    \$\begingroup\$ Furthermore, even with the base algorithm, you'd need to map results to complex (non-planar) surfaces, unless you're willing to restrict your game to simpler environments than they do. \$\endgroup\$ Commented Jun 30, 2021 at 16:50
  • 1
    \$\begingroup\$ Are you open to solutions that don't shape the blobs from pure math, but instead composite pre-made spat textures together? I've gotten good results doing it that way, and it's easy to art direct by just swapping to a different set of splat textures. \$\endgroup\$ Commented Jun 30, 2021 at 19:45

0

Reset to default

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.