3D burn dissolve
A dissolve shader with a burn effect for 3D models. Add a SimplexNoise to Dissolve Texture
This shader comes from GD Quest’s library of free shaders.
Shader code
shader_type spatial;
render_mode depth_draw_alpha_prepass, cull_disabled;
uniform vec4 albedo : hint_color;
uniform sampler2D texture_albedo : hint_albedo;
uniform vec4 emission_color : hint_color = vec4(1);
uniform float emission_amount;
uniform sampler2D dissolve_texture;
uniform float burn_size : hint_range(0,2);
uniform float dissolve_amount : hint_range(0,1);
void fragment() {
vec4 albedo_tex = texture(texture_albedo,UV);
ALBEDO = albedo.rgb * albedo_tex.rgb;
float sample = texture(dissolve_texture, UV).r;
float emission_value = 1.0 - smoothstep(dissolve_amount, dissolve_amount + burn_size, sample);
EMISSION = vec3(emission_value * emission_amount * emission_color.rgb);
ALPHA = smoothstep(dissolve_amount - burn_size, dissolve_amount, sample);
}
Godot 4 version
shader_type spatial;
render_mode depth_prepass_alpha, cull_disabled;
uniform vec4 albedo : source_color;
uniform sampler2D texture_albedo : hint_default_white;
uniform vec4 emission_color : source_color = vec4(1);
uniform float emission_amount;
uniform sampler2D dissolve_texture;
uniform float burn_size : hint_range(0,2);
uniform float dissolve_amount : hint_range(0,1);
void fragment() {
vec4 albedo_tex = texture(texture_albedo,UV);
ALBEDO = albedo.rgb * albedo_tex.rgb;
float sample = texture(dissolve_texture, UV).r;
float emission_value = 1.0 – smoothstep(dissolve_amount, dissolve_amount + burn_size, sample);
EMISSION = vec3(emission_value * emission_amount * emission_color.rgb);
ALPHA = smoothstep(dissolve_amount – burn_size, dissolve_amount, sample);
}
I had to use depth_draw_always instead of depth_prepass_alpha to get transparency to work in Godot 4 (4.0.stable).
You’re right, I had put the transparency on in the Geometry, with that at zero you get no transparency with my version. But using depth_draw_always works all the time.