Comment 0 for bug 172136

When using 3d box, we get custom vanishing points which will be basis for
all the drawing. it would be nice if there was some grids based on this
vanishing points having lines begining from those points and going in any
directions.
This could easily be done with stars (see example)

This is also usefull to draw extra shapes (for ex the top orange rectangle
in the example)

This could be set as a single click option in the doc prefs (with a button
like "get grids from VPts")