global vertex snapping with 3dresolution scaling

This shader converts all the vertex coordinates to global space using the object’s transform, then snaps every vertex to the nearest global position based on the “res” value which is a 3d scale of the implied resolution in global space. This was made in Godot 4.0.3.

Shader code

// created by zodiepupper and xlinka (https://github.com/xlinka)
shader_type spatial;
uniform float res;
uniform vec4 albedo;

void vertex() {
    vec3 scale = vec3(length(MODEL_MATRIX[0]), length(MODEL_MATRIX[1]), length(MODEL_MATRIX[2]));
    mat4 rot_matrix = mat4(normalize(MODEL_MATRIX[0]), normalize(MODEL_MATRIX[1]), normalize(MODEL_MATRIX[2]), vec4(0.0, 0.0, 0.0, 1.0));
    mat4 scale_matrix = mat4(vec4(scale.x, 0.0, 0.0, 0.0),
                             vec4(0.0, scale.y, 0.0, 0.0),
                             vec4(0.0, 0.0, scale.z, 0.0),
                             vec4(0.0, 0.0, 0.0, 1.0));
    vec4 world_pos = MODEL_MATRIX * vec4(VERTEX, 1.0);
    world_pos.xyz = round(world_pos.xyz * res) / res;
    vec4 local_pos = inverse(MODEL_MATRIX) * world_pos;

    VERTEX = (rot_matrix * scale_matrix * local_pos).xyz;
}

void fragment() {
    ALBEDO = albedo.rgb;
}

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