Multiple Material "Slots" for CanvasItem

Help
,
1

Godot Version

4.2.2

Question

I was needing multiple shaders on an AnimatedSprite2D and saw that there’s only one shader slot in the Material tab. Is there anything I can do to add multiple shadermaterials or should I just find a workaround? Thanks for any feedback.

2

One canvas item one material. You will probably need to write a custom shader. Or you can have multiple passes with different materials. It depends on your goals.

3

Yea, I’m asking because I made a shader that changes a color on the Sprite2D and I need more of those to change each color individually.

4

well if you setup your coloring on the sprite to say pure red, pure blue, pure green you can do a pixel color test to change its color.

vec4 pixel = texture(TEXTURE, uv);
// red test
if (pixel.r == 1.0){
  pixel = new_color()
}
else if ( pixel.g == 1.0){
// green
} else if (pixel.b == 1.0){
// blue
{

If you want seperate shaders you can add a next pass in the inspector. but you will have to set the alpha to 0 otherwise it will redraw some parts over the first shader. I think it best to just do it in one shader.

I guess you could get smart and have uniforms for the test colors and sample them in the editor, that way you wouldn’t have to recolor your sprite.
image

uniform vec4 test_color1: source_color; 
void fragment() {
  vec4 pixel = texture(TEXTURE, uv);
  // color test
  if (pixel == test_color1){
    pixel = new_color()
  } else if ...
}
1 Like
5

It’s fine now, I found a color swapping shader with palettes for Godot. Thank you for your help though! :slight_smile: