[3d] Add a tiny padding to the vector layer chunk loader root boundin…

…g box to avoid points at edge chopped off

src/3d/qgsvectorlayerchunkloader_p.cpp

@@ -142,6 +142,13 @@ QgsVectorLayerChunkLoaderFactory::QgsVectorLayerChunkLoaderFactory( const Qgs3DM
   , mLeafLevel( leafLevel )
 {
   QgsAABB rootBbox = Qgs3DUtils::layerToWorldExtent( vl->extent(), zMin, zMax, vl->crs(), map.origin(), map.crs(), map.transformContext() );
+  // add small padding to avoid clipping of point features located at the edge of the bounding box
+  rootBbox.xMin -= 1.0;
+  rootBbox.xMax += 1.0;
+  rootBbox.yMin -= 1.0;
+  rootBbox.yMax += 1.0;
+  rootBbox.zMin -= 1.0;
+  rootBbox.zMax += 1.0;
   setupQuadtree( rootBbox, -1, leafLevel );  // negative root error means that the node does not contain anything
 }