prismatic surface
prism
prism(id)poi(base)poi(dp)secy(ny)
Builds the phe prism identifierid, base line base moved ny times (1 by default) along dp = (dx, dy, dz) / ny,
which is a special case of:
geod(id)poi(base)poi(base+(dx,dy,dz)/ny)poi(base+2*(dx,dy,dz)/ny)....
Properties can be specified at creation.