feat: animate helicopter using simple_heading_animation with full 3-axis rotation

src/main.rs

@@ -17,6 +17,8 @@ mod util;
 mod mesh;
 mod scene_graph;
 use scene_graph::SceneNode;
+mod toolbox;
+use toolbox::simple_heading_animation;
 
 use glutin::event::{
     DeviceEvent,
@@ -438,6 +440,16 @@ fn main() {
                 let projection: glm::Mat4 =
                     glm::perspective(window_aspect_ratio, std::f32::consts::PI / 4.0, 1.0, 1000.0);
 
+                // Animate helicopter root via simple_heading_animation
+                let heading = simple_heading_animation(elapsed);
+                {
+                    let mut hr_pin = heli_root.as_mut();
+                    unsafe {
+                        let node = hr_pin.get_unchecked_mut();
+                        node.position = glm::vec3(heading.x, 0.0, heading.z);
+                        node.rotation = glm::vec3(heading.roll, heading.pitch, heading.yaw);
+                    }
+                }
                 // Update rotor rotations
                 {
                     let mut mr_pin = main_rotor_node.as_mut();