Fix hit-test samples for compatibility with SharpEngine v3.2.9386

As of SharpEngine v3.2.9386, a camera instance cannot be re-used
in a different scene view anymore. Some of the hit test samples
(Rectangular selection sample, Hit testing with ID bitmap sample)
need to be updated to accommodate this change; i.e., create new
instance of `TargetPositionCamera` and sync its properties on each
ID bitmap render pass.

Author: rokm

Ab4d.SharpEngine.Samples.Common/HitTesting/HitTestingWithIdBitmapSample.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics;
 using System.Numerics;
+using Ab4d.SharpEngine.Cameras;
 using Ab4d.SharpEngine.Common;
 using Ab4d.SharpEngine.Materials;
 using Ab4d.SharpEngine.SceneNodes;
@@ -64,6 +65,7 @@ public class HitTestingWithIdBitmapSample : CommonSample
     private Stopwatch _renderStopwatch = new Stopwatch();
 
     private SceneView? _bitmapIdSceneView;
+    private TargetPositionCamera? _bitmapIdCamera;
 
 
     public HitTestingWithIdBitmapSample(ICommonSamplesContext context)
@@ -235,13 +237,27 @@ private void RenderIdBitmap()
                 _bitmapIdSceneView = new SceneView(Scene, "BitmapID-SceneView");
                 _bitmapIdSceneView.Initialize(SceneView.Width, SceneView.Height, dpiScaleX: 1, dpiScaleY: 1, multisampleCount: 1, supersamplingCount: 1);
                 _bitmapIdSceneView.BackgroundColor = Color4.TransparentBlack; // Set BackgroundColor to (0,0,0,0) so it will be different from actual objects that will have alpha set to 1.
+
+                // SharpEngine >= v3.2.9386 does not allow re-using a camera in a different scene view, so we need to
+                // create a new instance, and sync its properties on each render pass.
+                _bitmapIdCamera = new TargetPositionCamera();
+                _bitmapIdSceneView.Camera = _bitmapIdCamera;
             }
             else if (_bitmapIdSceneView.Width != SceneView.Width || _bitmapIdSceneView.Height != SceneView.Height)
             {
                 _bitmapIdSceneView.Resize(SceneView.Width, SceneView.Height, renderNextFrameAfterResize: false);
             }
 
-            _bitmapIdSceneView.Camera = SceneView.Camera; // Use the same camera
+            // Sync the camera with the original TargetPositionCamera
+            if (targetPositionCamera != null && _bitmapIdCamera != null)
+            {
+                _bitmapIdCamera.Heading = targetPositionCamera.Heading;
+                _bitmapIdCamera.Attitude = targetPositionCamera.Attitude;
+                _bitmapIdCamera.Bank = targetPositionCamera.Bank;
+                _bitmapIdCamera.Distance = targetPositionCamera.Distance;
+                _bitmapIdCamera.TargetPosition = targetPositionCamera.TargetPosition;
+                _bitmapIdCamera.RotationCenterPosition = targetPositionCamera.RotationCenterPosition;
+            }
 
             usedBitmapIdSceneView = _bitmapIdSceneView;
         }

Ab4d.SharpEngine.Samples.Common/HitTesting/RectangularSelectionSample.cs

@@ -6,6 +6,7 @@
 using Ab4d.SharpEngine.Transformations;
 using Ab4d.SharpEngine.Utilities;
 using System.Diagnostics;
+using Ab4d.SharpEngine.Cameras;
 using Ab4d.Vulkan;
 
 namespace Ab4d.SharpEngine.Samples.Common.HitTesting;
@@ -102,6 +103,7 @@ public abstract class RectangularSelectionSample : CommonSample
     private DateTime _lastCameraChangedTime;
 
     private SceneView? _bitmapIdSceneView;
+    private TargetPositionCamera? _bitmapIdCamera;
 
 
     protected RectangularSelectionSample(ICommonSamplesContext context)
@@ -613,13 +615,27 @@ private void RenderIdBitmap()
                 _bitmapIdSceneView = new SceneView(Scene, "BitmapID-SceneView");
                 _bitmapIdSceneView.Initialize(SceneView.Width, SceneView.Height, dpiScaleX: 1, dpiScaleY: 1, multisampleCount: 1, supersamplingCount: 1);
                 _bitmapIdSceneView.BackgroundColor = Color4.TransparentBlack; // Set BackgroundColor to (0,0,0,0) so it will be different from actual objects that will have alpha set to 1.
+
+                // SharpEngine >= v3.2.9386 does not allow re-using a camera in a different scene view, so we need to
+                // create a new instance, and sync its properties on each render pass.
+                _bitmapIdCamera = new TargetPositionCamera();
+                _bitmapIdSceneView.Camera = _bitmapIdCamera;
             }
             else if (_bitmapIdSceneView.Width != SceneView.Width || _bitmapIdSceneView.Height != SceneView.Height)
             {
                 _bitmapIdSceneView.Resize(SceneView.Width, SceneView.Height, renderNextFrameAfterResize: false);
             }
 
-            _bitmapIdSceneView.Camera = SceneView.Camera; // Use the same camera
+            // Sync the camera with the original TargetPositionCamera
+            if (targetPositionCamera != null && _bitmapIdCamera != null)
+            {
+                _bitmapIdCamera.Heading = targetPositionCamera.Heading;
+                _bitmapIdCamera.Attitude = targetPositionCamera.Attitude;
+                _bitmapIdCamera.Bank = targetPositionCamera.Bank;
+                _bitmapIdCamera.Distance = targetPositionCamera.Distance;
+                _bitmapIdCamera.TargetPosition = targetPositionCamera.TargetPosition;
+                _bitmapIdCamera.RotationCenterPosition = targetPositionCamera.RotationCenterPosition;
+            }
 
             usedBitmapIdSceneView = _bitmapIdSceneView;
         }