[pstricks] suggestion for pst-3dplot

[Herbert Voss]

Markus schrieb:

> I have a suggestion for pst-3dplot:
> 
> Add a coordinate Type c0orType=4 (Trimetrie) defined by following 
> code (out of pst-3dplot.pro)
> 
>      coorType 4 le { % coorType |/_ with a 1/sqrt(2) shortend x-axis 
> and 135 degrees
>        /x2D x -1 mul 2 y mul add z 0 mul add  def %% z 0 mul --> not 
> really useful
>        /y2D x -1 mul -0.5 y mul add z 2 mul add def
>        exit } if

from my point of view the 3d-2d conversion wrong. However,
can you explain the conversion or show me a link?

Herbert