halfway through imgui, the context is really not ergonomic

src/camera.rs

@@ -136,16 +136,14 @@ impl CameraController {
 
     pub fn update_camera(&mut self, camera: &mut Camera, dt: f32) {
         // Move forward/backward and left/right
-        let (yaw_sin, yaw_cos) = camera.yaw.0.sin_cos();
-        let forward = Vector3::new(yaw_cos, 0.0, yaw_sin).normalize();
-        let right = Vector3::new(-yaw_sin, 0.0, yaw_cos).normalize();
-
         let view_vector = Vector3::new(
             (1.0 * camera.pitch.0.sin() * camera.yaw.0.sin()),
             (1.0 * camera.pitch.0.cos()),
             (1.0 * camera.pitch.0.sin() * camera.yaw.0.cos()),
         );
 
+        // Offset the yaw 90 degrees and set the pitch to level for our
+        // right / left hand translation vectors
         let offset = camera.yaw.0 + PI/2.0;
         let pitch = PI/2.0;
         let left_vector = Vector3::new(
@@ -156,19 +154,12 @@ impl CameraController {
 
         camera.position += view_vector * (self.amount_forward - self.amount_backward) * self.speed * dt;
         camera.position += left_vector * (self.amount_left - self.amount_right) * self.speed * dt;
-
-
-        // Move up/down. Since we don't use roll, we can just
-        // modify the y coordinate directly.
         camera.position.y += (self.amount_up - self.amount_down) * self.speed * dt;
 
         // Rotate
         camera.yaw += Rad(self.rotate_horizontal) * self.sensitivity * dt;
         camera.pitch += Rad(self.rotate_vertical) * self.sensitivity * dt;
 
-        // If process_mouse isn't called every frame, these values
-        // will not get set to zero, and the camera will rotate
-        // when moving in a non cardinal direction.
         self.rotate_horizontal = 0.0;
         self.rotate_vertical = 0.0;