r30557 reverted (#3530)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30602 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove hits below a region is used to create a point (e.g. segment below an opaque polygon)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30603 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Better 3D scene inverse matrix computation

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30604 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e