EgtGraphics :

- migliorato calcolo centro di vista in Zwin utilizzando GetPixelZ.
2026-01-22 11:00:44 +01:00
parent bbe4e99fe8
commit bcb3c189a1
3 changed files with 24 additions and 1 deletions
@@ -941,6 +941,24 @@ Scene::UnProject( const Point3d& ptView, Point3d& ptWorld) const
   return ( nRes == GL_TRUE) ;
 }

+//----------------------------------------------------------------------------
+bool
+Scene::GetPixelZ( const Point3d& ptWin, double& dWinZ)
+{
+   glGetError() ;
+   GLint Viewport[ 4] ;
+   glGetIntegerv( GL_VIEWPORT, Viewport) ;
+   float dZ ;
+   glReadBuffer( GL_FRONT) ;
+   glReadPixels( int( ptWin.x), Viewport[3] - int( ptWin.y), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &dZ) ;
+   if ( glGetError() == GL_NO_ERROR  &&  dZ > 0.001  &&  dZ < 0.999) {
+      dWinZ = dZ ;
+      return true ;
+   }
+   dWinZ = GetProjectedCenter().z ;
+   return false ;
+}
+
 //----------------------------------------------------------------------------
 void
 Scene::Destroy( void)