Dissolve

This dissolve shader can be used for effects like a character or object burning away, fading out, or vanishing with noise-based erosion.

Parameter	Description
dissolve_texture	Noise or gradient texture to control dissolve
dissolve_amount	From 0.0 (fully visible) to 1.0 (fully gone)
edge_color	Color of the dissolving edge (e.g., flame, glow)
edge_thickness	How thick the glowing edge is

shader_type canvas_item;

uniform sampler2D dissolve_texture; // grayscale noise/gradient
uniform float dissolve_amount : hint_range(0.0, 1.0) = 0.0;
uniform vec4 edge_color : source_color = vec4(1.0, 0.3, 0.0, 1.0); // fiery edge
uniform float edge_thickness : hint_range(0.0, 0.2) = 0.05;

void fragment() {
    vec4 tex_color = texture(TEXTURE, UV);
    float dissolve_value = texture(dissolve_texture, UV).r;

    float edge_start = dissolve_amount - edge_thickness;
    float edge_end = dissolve_amount;

    if (dissolve_value < edge_start) {
        // Fully dissolved
        discard;
    } else if (dissolve_value < edge_end) {
        // Edge glow
        COLOR = edge_color;
    } else {
        // Normal rendering
        COLOR = tex_color;
    }
}