Snowy Snow Shader - GameMaker

One in a while, one of the technical artists who I know will mention a shader that can automatically place snow, etc on the top-facing sides of rocks and buildings and stuff. So I decided to do it in GameMaker!

Supply a secondary texture (for snow, moss, whatever) to draw onto the 3D model, as well as a direction - snow will probably go on the top of a top of the model, while moss would go on the side - and draw using the shader. It's pretty simple. If you want to use it with another shader, like lighting, it's pretty easy to plug into your existing code.

What's Included

• A shader
• A demo
• A demo for the Raspberry Pi (because of course I would)
• The code for the demo

Vertex Formats

The shaders expect a 36-byte vertex format defined with a 3D position, a 3D normal, a 2D texture coordinate, and a 4D color. If your game builds vertex buffers with a different format, you will need to edit the attribute list in each shader. I won't do this for you; that's on you. Generally speaking, position/normal/texture/color is sufficient for just about everything and if you're using a vertex format besides that you probably already know to watch out for that.

How This Works

Dot products. Dot products make the world go 'round.

Price

Whatever.

Notes

• This probably would have been named "Penguin" if I hadn't already decided to use that for something else last year

Repository

N/A this time.

Documentation

can be found here.

Credits

The chicken walking sprite was created by @alemunin

The rock meshes and snow texture in the demo were created by polyhaven.com

The moss texture was created by p0ss on opengameart.org

The skybox in the demo was created by Spiney

The iconigraphy is based on Snow by Loritas Aventura from the Noun Project