Wanted: Very Simple 3D system

[bplus]

By very simple I mean convert and x,y,z coordinate in 3D array to an x,y screen coordinate such that we sim a 3D
eg,
SUB Sim3D(xyzPointInFromArray, xyPointOutToScreenGraph)

Mainly we need this to use for _MapTriangle to wall cubes with triangles (2 per face)

I think there is some simple formula that does sin and/or cos with x combined with z and another for y combined with z.