Pantheon Benchmark: Antigravity 2.0 / Flash 3.5 (High)

// OpenSCAD Pantheon Model
// All dimensions are approximately 1:1 in meters.

// --- Global Rendering Settings ---
$fn = 24; // Render resolution. Use 15-24 for fast preview, 40-60 for final quality.
show_cutaway = false; // Toggle to view the interior niches, coffers, and sphere

// --- Main Colors ---
color_stone = [0.93, 0.90, 0.85];       // Travertine stone (light warm grey)
color_dark_stone = [0.82, 0.78, 0.72];  // Older/weathered stone
color_brick = [0.72, 0.53, 0.38];       // Roman brickwork (terracotta)
color_granite_grey = [0.55, 0.55, 0.55]; // Egyptian grey granite (front columns)
color_granite_red = [0.70, 0.50, 0.45];  // Egyptian pinkish-red granite (inner columns)
color_bronze = [0.45, 0.38, 0.30];       // Patinated bronze (doors and oculus)
color_roof = [0.65, 0.65, 0.60];         // Lead/stone roof tiling

// --- Architectural Parameters ---
rotunda_r_int = 21.65;
rotunda_r_ext = 27.65;
rotunda_h_cyl = 30.40;
rotunda_h_int_cyl = 21.65;

dome_r_int = 21.65;
dome_r_ext = 33.74;     // Calculated radius for external dome sphere
dome_center_z = 12.56;  // Calculated Z center (includes 1.5m plinth)
oculus_r = 4.5;

portico_w = 34.20;
portico_d = 15.60;
portico_h_col = 12.00;
portico_r_col = 0.75;
portico_x_start = 35.35; // Position of the back row of columns

// --- 1. Base / Plinth Module ---
module base_plinth() {
    color(color_stone) {
        // Rotunda circular plinth (stepped, 3 steps)
        for (i = [0:2]) {
            translate([0, 0, i * 0.5])
                cylinder(r = rotunda_r_ext + 1.5 - i * 0.5, h = 0.5, $fn = 80);
        }
        
        // Portico rectangular plinth (extending from the rotunda to the front)
        // From X = 20.0 to X = 52.0 (extra space for steps in front)
        for (i = [0:2]) {
            translate([20.0, -(portico_w/2 + 1.0 - i * 0.3), i * 0.5])
                cube([32.0 - i * 0.3, portico_w + 2.0 - i * 0.6, 0.5]);
        }
    }
}

// --- 2. Portico Column Module ---
module column(is_grey) {
    color(is_grey ? color_granite_grey : color_granite_red) {
        // Base
        cylinder(r1 = 1.0, r2 = 0.9, h = 0.4);
        // Shaft (tapered)
        translate([0, 0, 0.4])
            cylinder(r1 = 0.75, r2 = 0.65, h = 10.6);
    }
    // Capital (carved marble)
    color(color_stone) {
        translate([0, 0, 11.0]) {
            cylinder(r1 = 0.65, r2 = 0.85, h = 0.8);
            translate([-0.9, -0.9, 0.8])
                cube([1.8, 1.8, 0.2]);
        }
    }
}

// --- 3. Portico Columns Assembly ---
module portico_columns() {
    // Column coordinates
    // Front row (X = 49.5): 8 columns
    // Middle row (X = 43.0): 4 columns
    // Back row (X = 36.5): 4 columns
    // Y spacing spans from -15.5 to 15.5
    
    y_cols = [-15.5, -11.07, -6.64, -2.21, 2.21, 6.64, 11.07, 15.5];
    
    // Front row (all grey granite)
    for (y = y_cols) {
        translate([49.5, y, 1.5])
            column(is_grey = true);
    }
    
    // Middle row (pink/red granite, aligned with cols 0, 2, 5, 7)
    for (y = [-15.5, -6.64, 6.64, 15.5]) {
        translate([43.0, y, 1.5])
            column(is_grey = false);
    }
    
    // Back row (pink/red granite, aligned with cols 0, 2, 5, 7)
    for (y = [-15.5, -6.64, 6.64, 15.5]) {
        translate([36.5, y, 1.5])
            column(is_grey = false);
    }
}

// --- 4. Portico Roof & Pediment ---
module portico_roof() {
    // Entablature (sits on columns at Z = 13.5)
    color(color_stone) {
        translate([35.5, -portico_w/2, 13.5])
            cube([15.0, portico_w, 2.5]);
            
        // Overhanging Cornice
        translate([35.2, -(portico_w/2 + 0.3), 16.0])
            cube([15.6, portico_w + 0.6, 0.5]);
    }
    
    // Triangular Pediment (Front Gable)
    color(color_stone) {
        translate([49.3, 0, 0])
        rotate([0, 90, 0])
        rotate([0, 0, 90])
        linear_extrude(height = 1.5) {
            polygon(points = [
                [-(portico_w/2 + 0.3), 16.5],
                [(portico_w/2 + 0.3), 16.5],
                [0, 22.0]
            ]);
        }
    }
    
    // Inscription on the frieze
    color(color_bronze) {
        translate([50.55, 0, 14.75])
        rotate([90, 0, 90])
        linear_extrude(height = 0.1)
            text("M·AGRIPPA·L·F·COS·TERTIVM·FECIT", size = 1.2, font = "Liberation Serif:style=Bold", halign = "center", valign = "center");
    }

    // Portico Roof Tiling
    color(color_roof) {
        translate([35.4, 0, 0])
        rotate([0, 90, 0])
        rotate([0, 0, 90])
        linear_extrude(height = 13.8) {
            polygon(points = [
                [-portico_w/2, 16.6],
                [portico_w/2, 16.6],
                [0, 22.1]
            ]);
        }
    }
}

// --- 5. Intermediate Block ---
module intermediate_block() {
    // Brick walls
    color(color_brick) {
        translate([20.0, 0, 0])
        rotate([0, 90, 0])
        rotate([0, 0, 90])
        linear_extrude(height = 15.5) {
            polygon(points = [
                [-17.1, 1.5],
                [17.1, 1.5],
                [17.1, 16.5],
                [0, 26.0], // Higher gable
                [-17.1, 16.5]
            ]);
        }
    }
    // Marble detail band at the top of walls
    color(color_stone) {
        translate([20.0, -17.2, 16.0])
            cube([15.5, 34.4, 0.5]);
    }
}

// --- 6. Rotunda Exterior Walls ---
module rotunda_exterior() {
    color(color_brick) {
        // Main cylinder
        translate([0, 0, 1.5])
            cylinder(r = rotunda_r_ext, h = rotunda_h_cyl, $fn = 120);
            
        // Stepped rings at the very top of the wall
        translate([0, 0, 1.5 + rotunda_h_cyl])
            cylinder(r = rotunda_r_ext - 0.2, h = 0.5, $fn = 120);
    }
    
    // Horizontal Cornices (travertine bands)
    color(color_stone) {
        // Lower Cornice
        translate([0, 0, 12.0])
            cylinder(r = rotunda_r_ext + 0.3, h = 0.6, $fn = 120);
        // Middle Cornice
        translate([0, 0, 22.0])
            cylinder(r = rotunda_r_ext + 0.3, h = 0.6, $fn = 120);
        // Upper Cornice (Roof line)
        translate([0, 0, 31.0])
            cylinder(r = rotunda_r_ext + 0.4, h = 0.8, $fn = 120);
    }
}

// --- 7. Rotunda Interior Cella ---
module rotunda_interior() {
    // Hollow out the cylinder interior
    color(color_stone)
        translate([0, 0, 1.5])
            cylinder(r = rotunda_r_int, h = rotunda_h_int_cyl + 0.1, $fn = 120);
}

// --- 8. Interior Niches ---
module interior_niches() {
    // 7 niches and 1 door opening. Alternating semicircular and rectangular niches.
    // Semicircular niches at 90, 180, 270 degrees.
    // Rectangular niches at 45, 135, 225, 315 degrees.
    // Door opening is at 0 degrees.
    
    color(color_stone) {
        render(convexity = 6) {
            for (a = [45, 90, 135, 180, 225, 270, 315]) {
                rotate([0, 0, a]) {
                    if (a == 90 || a == 180 || a == 270) {
                        // Semicircular niche
                        translate([rotunda_r_int - 1.0, 0, 1.5])
                            cylinder(r = 3.5, h = 10.0, $fn = 40);
                    } else {
                        // Rectangular niche
                        translate([rotunda_r_int - 1.0, -3.0, 1.5])
                            cube([4.0, 6.0, 10.0]);
                    }
                }
            }
        }
    }
}

// --- 9. Door Opening & Bronze Doors ---
module door_opening_and_doors() {
    // Subtract the door opening
    translate([20.0, -3.0, 1.5])
        cube([9.0, 6.0, 12.0]);
        
    // Left and Right Bronze Doors (if not cut away)
    // Placed slightly open inside the opening
    color(color_bronze) {
        // Left Door (pivot at Y = -3.0, X = 23.5)
        translate([23.5, -3.0, 1.5])
        rotate([0, 0, 25]) // slightly open
        translate([-0.15, 0, 0])
            cube([0.3, 3.0, 12.0]);
            
        // Right Door (pivot at Y = 3.0, X = 23.5)
        translate([23.5, 3.0, 1.5])
        rotate([0, 0, -25]) // slightly open
        translate([-0.15, -3.0, 0])
            cube([0.3, 3.0, 12.0]);
    }
}

// --- 10. Dome Module (Stepped Exterior & Smooth Inner Sphere) ---
module dome_exterior() {
    // Stepped rings (7 rings of decreasing radius)
    color(color_brick) {
        for (i = [0:6]) {
            translate([0, 0, 31.90 + i * 0.8])
                cylinder(r = rotunda_r_ext - i * 0.8, h = 0.8, $fn = 120);
        }
    }
    
    // Smooth dome top (shallow sphere cap)
    color(color_roof) {
        translate([0, 0, dome_center_z])
            difference() {
                sphere(r = dome_r_ext, $fn = 120);
                // Slice away the bottom of the sphere relative to the sphere center.
                // We want to slice below global Z = 37.50 (where stepped rings end).
                // Relative Z = 37.50 - dome_center_z = 37.50 - 12.56 = 24.94.
                translate([-50, -50, -40])
                    cube([100, 100, 40 + 24.94]);
            }
    }
}

module dome_interior() {
    // Inner hemispherical dome
    color(color_stone)
        translate([0, 0, 23.15])
            sphere(r = dome_r_int, $fn = 120);
}

// --- 11. Coffered Ceiling Module ---
module coffer_shape(phi) {
    // Size decreases near the top of the dome (proportional to cos(phi))
    w = 4.2 * cos(phi);
    depth = 0.8;
    
    // A coffer is a stepped pocket recess
    // Step 1: outer step
    translate([-w/2, -w/2, 0])
        cube([w, w, depth/3 + 0.1]);
        
    // Step 2: middle step
    w2 = w * 0.8;
    translate([-w2/2, -w2/2, depth/3])
        cube([w2, w2, depth/3 + 0.1]);
        
    // Step 3: inner step
    w3 = w * 0.6;
    translate([-w3/2, -w3/2, 2*depth/3])
        cube([w3, w3, depth/3 + 0.1]);
}

module dome_coffers() {
    // 5 rows of 28 coffers
    // Spaced between 12.0 and 54.0 degrees elevation
    phi_rows = [12.0, 22.5, 33.0, 43.5, 54.0];
    
    color(color_stone) {
        render(convexity = 10) {
            for (row = [0:4]) {
                phi = phi_rows[row];
                for (col = [0:27]) {
                    theta = col * (360.0 / 28.0);
                    translate([0, 0, 23.15]) // Shift to dome center!
                    rotate([0, 0, theta])
                    rotate([0, 90 - phi, 0])
                    translate([0, 0, dome_r_int - 0.1])
                        coffer_shape(phi);
                }
            }
        }
    }
}

// --- 12. Oculus Module ---
module oculus() {
    color(color_bronze) {
        // Bronze trim around the oculus
        translate([0, 0, 23.15 + dome_r_int - 0.5])
            difference() {
                cylinder(r = oculus_r + 0.5, h = 1.5, $fn = 80);
                translate([0, 0, -0.1])
                    cylinder(r = oculus_r, h = 1.7, $fn = 80);
            }
    }
}

// --- 13. Full Pantheon Model Assembly ---
module pantheon_assembly() {
    difference() {
        // Solid geometry
        union() {
            base_plinth();
            rotunda_exterior();
            dome_exterior();
            intermediate_block();
            portico_roof();
        }
        
        // Internal hollow space
        rotunda_interior();
        
        // Niches inside the rotunda wall
        interior_niches();
        
        // Door opening
        color(color_stone)
            translate([20.0, -3.0, 1.5])
                cube([9.0, 6.0, 12.0]);
            
        // Dome interior space
        dome_interior();
        
        // Coffers in the dome ceiling
        dome_coffers();
        
        // Oculus hole (cuts through everything at the very top)
        color(color_stone)
            translate([0, 0, 30.0])
                cylinder(r = oculus_r, h = 25.0, $fn = 80);
    }
    
    // Add columns (non-subtracted)
    portico_columns();
    
    // Add bronze door panels (non-subtracted)
    // Pivot points and doors are placed inside the doorway
    color(color_bronze) {
        translate([23.5, -3.0, 1.5])
        rotate([0, 0, 25])
        translate([-0.15, 0, 0])
            cube([0.3, 3.0, 12.0]);
            
        translate([23.5, 3.0, 1.5])
        rotate([0, 0, -25])
        translate([-0.15, -3.0, 0])
            cube([0.3, 3.0, 12.0]);
    }

    // Add bronze oculus trim
    oculus();
}

// --- 14. Render Output (with Cutaway support) ---
difference() {
    pantheon_assembly();
    
    if (show_cutaway) {
        // Cut away the front-left half (Y < 0) to view the interior
        // Applying color_brick makes the cut cross-sections of the walls look like Roman brickwork
        color(color_brick)
            translate([-100, -200, -10])
                cube([200, 200, 200]);
    }
}