$fn=64;

// --- Parameters ---
panel_width = 160;
panel_height = 120;
panel_thickness = 3;

tab_width = 100;
tab_height = 10;
tab_thickness = 2.8; // Slightly thinner than panel for easy slotting

emboss_depth = 1.0;

// --- Modules ---
module star(x, z, size) {
    translate([x, panel_thickness - 0.1, z])
    rotate([-90, 0, 0])
    union() {
        cube([size, size/3, (emboss_depth + 0.1)*2], center=true);
        cube([size/3, size, (emboss_depth + 0.1)*2], center=true);
    }
}

module dot(x, z, r) {
    translate([x, panel_thickness - 0.1, z])
    rotate([-90, 0, 0])
    cylinder(r=r, h=emboss_depth + 0.1);
}

// --- Main Geometry ---
union() {
    // Main Backdrop Panel
    translate([-panel_width/2, 0, 0])
        cube([panel_width, panel_thickness, panel_height]);

    // Mounting Tab (slots into baseplate rear)
    translate([-tab_width/2, (panel_thickness - tab_thickness)/2, -tab_height])
        cube([tab_width, tab_thickness, tab_height + 0.1]);

    // Panel Border / Frame
    translate([-panel_width/2, panel_thickness - 0.1, 0])
        cube([panel_width, emboss_depth + 0.1, 4]); // Bottom
    translate([-panel_width/2, panel_thickness - 0.1, panel_height - 4])
        cube([panel_width, emboss_depth + 0.1, 4]); // Top
    translate([-panel_width/2, panel_thickness - 0.1, 0])
        cube([4, emboss_depth + 0.1, panel_height]); // Left
    translate([panel_width/2 - 4, panel_thickness - 0.1, 0])
        cube([4, emboss_depth + 0.1, panel_height]); // Right

    // --- Sci-Fi Space Details (Embossed for easy 3D printing without supports) ---
    
    // Ringed Planet
    translate([panel_width*0.25, panel_thickness - 0.1, panel_height*0.7])
    rotate([-90, 0, 0]) {
        // Planet body
        cylinder(r=20, h=emboss_depth + 0.1);
        // Planet ring
        difference() {
            scale([1.5, 0.4, 1]) cylinder(r=25, h=emboss_depth + 0.1);
            scale([1.5, 0.4, 1]) translate([0, 0, -1]) cylinder(r=22, h=emboss_depth + 3);
        }
    }

    // Distant Moon
    translate([-panel_width*0.35, panel_thickness - 0.1, panel_height*0.8])
    rotate([-90, 0, 0])
    cylinder(r=8, h=emboss_depth + 0.1);

    // Starfield (4-Point Stars)
    star(-40, 100, 6);
    star(10, 80, 4);
    star(-55, 45, 5);
    star(50, 40, 7);
    star(-10, 20, 4);

    // Starfield (Dots/Distant Stars)
    dot(-20, 105, 1);
    dot(-50, 70, 1.5);
    dot(30, 105, 1);
    dot(60, 80, 1.2);
    dot(0, 50, 1);
    dot(-30, 30, 1.5);
    dot(40, 15, 1);
    dot(70, 50, 1);
    dot(-65, 90, 1.2);
}