Add instructions

examples/3d/orthographic_zoom.rs

@@ -25,8 +25,15 @@ fn setup(
  mut meshes: ResMut<Assets<Mesh>>,
  mut materials: ResMut<Assets<StandardMaterial>>,
 ) {
- // Camera3dBundle defaults to using a PerspectiveProjection
+ // Find the middle of the zoom range
+ let initial_scale = (CAMERA_ZOOM_RANGE.end - CAMERA_ZOOM_RANGE.start) / 2.0;
+
  commands.spawn(Camera3dBundle {
+ projection: OrthographicProjection {
+ scaling_mode: ScalingMode::FixedVertical(initial_scale),
+ ..default()
+ }
+ .into(),
  transform: Transform::from_xyz(5.0, 5.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
  ..default()
  });
@@ -76,7 +83,7 @@ fn camera_controls(
  // Accumulate mouse wheel inputs for this tick
  // TODO: going away in 0.15 with AccumulatedMouseScroll
  let delta_zoom: f32 = mouse_wheel_input.read().map(|e| e.y).sum();
- if delta_zoom != 0.0 {
+ if delta_zoom == 0.0 {
  return;
  }
 

examples/3d/perspective_zoom.rs

@@ -52,6 +52,9 @@ fn setup(
  transform: Transform::from_xyz(3.0, 8.0, 5.0),
  ..default()
  });
+
+ info!("Zoom in and out with mouse wheel.");
+ info!("Orbit camera with A and D.");
 }
 
 fn camera_controls(
@@ -87,6 +90,5 @@ fn camera_controls(
  // Adjust the field of view, but keep it within our stated range
  perspective.fov = (perspective.fov + CAMERA_ZOOM_SPEED * delta_zoom)
  .clamp(CAMERA_ZOOM_RANGE.start, CAMERA_ZOOM_RANGE.end);
- dbg!(perspective.fov);
  }
 }