From 0025df5d29fadc874482f6c4bb3774435cab038a Mon Sep 17 00:00:00 2001
From: Rich Churcher <rich.churcher@gmail.com>
Date: Sun, 8 Sep 2024 20:01:11 +1200
Subject: [PATCH] Add instructions

---
 examples/3d/orthographic_zoom.rs | 11 +++++++++--
 examples/3d/perspective_zoom.rs  |  4 +++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/examples/3d/orthographic_zoom.rs b/examples/3d/orthographic_zoom.rs
index 5d8a43d440bff2..07092a282054e1 100644
--- a/examples/3d/orthographic_zoom.rs
+++ b/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;
     }
 
diff --git a/examples/3d/perspective_zoom.rs b/examples/3d/perspective_zoom.rs
index 871a34a35db31c..75caa82c71d404 100644
--- a/examples/3d/perspective_zoom.rs
+++ b/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);
     }
 }