XYZ data into AC3D

[Mossie]

Ok, found that pf file format, I assume is:

grid x grid y
pos x pos y height z
pos x pos y height z

Or should it be
grid x grid y
height z
height z

If the first then I've a new error
"myalloc 8 failed
unable to alloc 8 bytes"

I think this is a file error, thoughts please.