Spatial Pixelation

TV witness protection style / censoring 3D pixelation.

Shader code

shader_type spatial;
render_mode unshaded, depth_draw_always, cull_back;

uniform float pixelation : hint_range(0.001, 0.1) = 0.01;
uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;

void vertex() {
    POSITION = PROJECTION_MATRIX * MODELVIEW_MATRIX * vec4(VERTEX, 1.0);
}

void fragment() {
    // Get screen UV
    vec2 screen_uv = SCREEN_UV;
    
    // Calculate pixelated UV
    vec2 pixel_uv = vec2(
        floor(screen_uv.x / pixelation) * pixelation,
        floor(screen_uv.y / pixelation) * pixelation
    );
    
    // Sample the screen texture with pixelated UV
    vec4 screen_color_pixelized = texture(SCREEN_TEXTURE, pixel_uv);
    
    // Output the pixelated color
    ALBEDO = screen_color_pixelized.rgb;
    ALPHA = screen_color_pixelized.a;
}