clean code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34798 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Better check for 3D points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34799 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Better override

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34800 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Better override

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34801 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e