there are 25.4 mm per in

Author: uclaros

src/app/3d/qgs3dmaptoolidentify.cpp

@@ -109,7 +109,7 @@ void Qgs3DMapToolIdentify::mouseReleaseEvent( QMouseEvent *event )
     // estimate search radius
     Qgs3DMapScene *scene = mCanvas->scene();
     const double searchRadiusMM = QgsMapTool::searchRadiusMM();
-    const double pixelsPerMM = mCanvas->screen()->logicalDotsPerInchX(); // mCanvas->logicalDpiX() / 25.4;
+    const double pixelsPerMM = mCanvas->screen()->logicalDotsPerInchX() / 25.4;
     const double searchRadiusPx = searchRadiusMM * pixelsPerMM;
     const double searchRadiusMapUnits = scene->worldSpaceError( searchRadiusPx, hit.distance );