Simple Spiral
I made this very simple spiral shader on accident, so I decided to save and share in case I need it in the future.
Shader code
shader_type canvas_item;
uniform float ring_amount = 3.;
uniform int line_amount = 1;
uniform vec2 offset;
uniform vec2 scale = vec2(1,1);
void fragment() {
vec2 curr_uv = UV;
curr_uv += offset;
curr_uv *= scale;
vec2 uv_offset = vec2(0.5 * scale);
float angle = atan(curr_uv.y - uv_offset.x, curr_uv.x - uv_offset.y);
float curr_dist = distance(curr_uv, uv_offset);
float curr_value = round(sin(curr_dist * (ring_amount * 10.) + angle * float(line_amount)));
COLOR.rgb = vec3(curr_value);
}
