material-maker/addons/material_maker/nodes/preview_sdf2d.shader

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void fragment() {
vec2 uv = UV;
$(code)
float d = $(value);
vec3 col = vec3(cos(d*min(256, preview_size)));
col *= clamp(1.0-d*d, 0.0, 1.0);
col *= vec3(1.0, vec2(step(-0.015, d)));
col *= vec3(vec2(step(d, 0.015)), 1.0);
COLOR = vec4(col, 1.0);
}