add Qgs3DUtils::rayFromScreenPoint

src/3d/qgs3dutils.cpp

@@ -566,3 +566,29 @@ QgsPhongMaterialSettings Qgs3DUtils::phongMaterialFromQt3DComponent( Qt3DExtras:
   settings.setShininess( material->shininess() );
   return settings;
 }
+
+QgsRay3D Qgs3DUtils::rayFromScreenPoint( const QPoint &point, const QSize &windowSize, Qt3DRender::QCamera *camera )
+{
+  QVector3D deviceCoords( point.x(), point.y(), 0.0 );
+  // normalized device coordinates
+  QVector3D normDeviceCoords( 2.0 * deviceCoords.x() / windowSize.width() - 1.0f, 1.0f - 2.0 * deviceCoords.y() / windowSize.height(), camera->nearPlane() );
+  // clip coordinates
+  QVector4D rayClip( normDeviceCoords.x(), normDeviceCoords.y(), -1.0, 0.0 );
+
+  QMatrix4x4 projMatrix = camera->projectionMatrix();
+  QMatrix4x4 viewMatrix = camera->viewMatrix();
+
+  // ray direction in view coordinates
+  QVector4D rayDirView = projMatrix.inverted() * rayClip;
+  // ray origin in world coordinates
+  QVector4D rayOriginWorld = viewMatrix.inverted() * QVector4D( 0.0f, 0.0f, 0.0f, 1.0f );
+
+  // ray direction in world coordinates
+  rayDirView.setZ( -1.0f );
+  rayDirView.setW( 0.0f );
+  QVector4D rayDirWorld4D = viewMatrix.inverted() * rayDirView;
+  QVector3D rayDirWorld( rayDirWorld4D.x(), rayDirWorld4D.y(), rayDirWorld4D.z() );
+  rayDirWorld = rayDirWorld.normalized();
+
+  return QgsRay3D( QVector3D( rayOriginWorld ), rayDirWorld );
+}

src/3d/qgs3dutils.h

@@ -35,6 +35,9 @@ namespace Qt3DExtras
 #include "qgs3danimationsettings.h"
 #include "qgs3dtypes.h"
 #include "qgsaabb.h"
+#include "qgsray3d.h"
+
+#include <Qt3DRender/QCamera>
 
 #include <memory>
 
@@ -174,6 +177,9 @@ class _3D_EXPORT Qgs3DUtils
 
     //! Returns phong material settings object based on the Qt3D material
     static QgsPhongMaterialSettings phongMaterialFromQt3DComponent( Qt3DExtras::QPhongMaterial *material );
+
+    //! Convert from clicked point on the screen to a ray in world coordinates
+    static QgsRay3D rayFromScreenPoint( const QPoint &point, const QSize &windowSize, Qt3DRender::QCamera *camera );
 };
 
 #endif // QGS3DUTILS_H

src/app/3d/qgs3dmapcanvas.cpp

@@ -34,6 +34,7 @@
 #include "qgsflatterraingenerator.h"
 #include "qgsonlineterraingenerator.h"
 #include "qgsray3d.h"
+#include "qgs3dutils.h"
 
 Qgs3DMapCanvas::Qgs3DMapCanvas( QWidget *parent )
   : QWidget( parent )
@@ -257,27 +258,7 @@ void Qgs3DMapCanvas::updateTemporalRange( const QgsDateTimeRange &temporalrange
 
 void Qgs3DMapCanvas::identifyPointCloudOnMouseEvent( QVector<QPair<QgsMapLayer *, QVector<QVariantMap>>> &result, QMouseEvent *event )
 {
-  QVector3D deviceCoords( event->x(), event->y(), 0.0 );
-  QSize windowSize = mEngine->size();
-  // normalized device coordinates
-  QVector3D normDeviceCoords( 2.0 * deviceCoords.x() / windowSize.width() - 1.0f, 1.0f - 2.0 * deviceCoords.y() / windowSize.height(), mEngine->camera()->nearPlane() );
-  // clip coordinates
-  QVector4D rayClip( normDeviceCoords.x(), normDeviceCoords.y(), -1.0, 0.0 );
-
-  QMatrix4x4 projMatrix = mEngine->camera()->projectionMatrix();
-  QMatrix4x4 viewMatrix = mEngine->camera()->viewMatrix();
-
-  // ray direction in view coordinates
-  QVector4D rayDirView = projMatrix.inverted() * rayClip;
-  // ray origin in world coordinates
-  QVector4D rayOriginWorld = viewMatrix.inverted() * QVector4D( 0.0f, 0.0f, 0.0f, 1.0f );
-
-  // ray direction in world coordinates
-  rayDirView.setZ( -1.0f );
-  rayDirView.setW( 0.0f );
-  QVector4D rayDirWorld4D = viewMatrix.inverted() * rayDirView;
-  QVector3D rayDirWorld( rayDirWorld4D.x(), rayDirWorld4D.y(), rayDirWorld4D.z() );
-  rayDirWorld = rayDirWorld.normalized();
-
-  mScene->identifyPointCloudOnRay( result, QgsRay3D( QVector3D( rayOriginWorld ), rayDirWorld ) );
+  QgsRay3D ray = Qgs3DUtils::rayFromScreenPoint( event->pos(), mEngine->size(), mEngine->camera() );
+
+  mScene->identifyPointCloudOnRay( result, ray );
 }