Add basic pyramid brush generator

editor/src/main.rs

@@ -31,9 +31,45 @@ fn generate_box_brush(position: Vec3, extent: Vec3) -> Brush {
     }
 }
 
+/// Position is center of base plane
+fn generate_pyramid_brush(position: Vec3, height: f32, side_count: u32) -> Brush {
+    let tip = position + Vec3::Y * height;
+    let base_plane = Plane::from_point_normal(position, Vec3::NEG_Y);
+
+    let mut brush_planes = vec![BrushPlane {
+        plane: base_plane,
+        ..Default::default()
+    }];
+
+    for i in 0..side_count {
+        let angle = (i as f32 / side_count as f32) * 360.0_f32.to_radians();
+        dbg!(angle);
+        let rot_mat = Mat3::from_cols(
+            Vec3::new(angle.cos(), 0.0, -angle.sin()),
+            Vec3::Y,
+            Vec3::new(angle.sin(), 0.0, angle.cos()),
+        );
+        let normal = rot_mat * Vec3::new(1.0, 1.0, 0.0);
+        dbg!(normal);
+
+        brush_planes.push(BrushPlane {
+            plane: Plane::from_point_normal(tip, normal),
+            ..Default::default()
+        });
+    }
+
+    Brush {
+        planes: brush_planes,
+    }
+}
+
 fn main() {
     let brush = generate_box_brush(Vec3::new(1.0, 0.0, 0.0), Vec3::new(1.0, 2.0, 1.0));
     let vs = brush.get_vertices();
 
     println!("Vertices: {vs:?}");
+
+    let vs = generate_pyramid_brush(Vec3::ZERO, 1.0, 4).get_vertices();
+
+    println!("Vertices: {vs:?}");
 }