IBM Release 1.93 manual Curve, 3DCURVE, Cylinder

	corners. This primitive is especially useful with plane wave
	illumination, where we want PMLs only on the front and back faces
	of the region. The wide face of the object must touch one of the
	faces of the simulation domain. The PML absorption directions will
	be the outward normals for the face, outward-directed face
	diagonals for the edges, and outward-directed body diagonals for
	the corners. If for some reason you call this with an ordinary
	material, it just adds a regular block.
	Parameters: mattype xlo xhi ylo yhi zlo zhi
CURVE	Adds a curved object whose path is expressed by a user-defined
	planar curve, (u(s), v(s)), and whose outline is swept out by the
	region f(q,r) > 0 as the parameter s advances from slo to shi.
	Variable q is the normal to the plane, and r is parallel to q × (du/ds,
	dv/ds). This statement can be used to make very general curved
	objects of variable cross-section. Due to the uniform rectangular
	grid employed by FIDO/TEMPEST, curved objects will look somewhat
	different depending on the direction of their axes at any given
	place. POEMS attempts to minimize this effect.
	Parameters: mattype slo shi perp hfunc vfunc
	Not implemented in this release.
3DCURVE	Like CURVE, but the axial curve is allowed to be nonplanar. This
	statement is more complicated to use, due to the noncommuting
	property of 3-D rotations—in specifying the functions u, v, w, it’s
	easy to get mixed up by the way they rotate around.
	Parameters:
	Not implemented in this release.
CYLINDER	Adds an object whose axis is a straight line, but whose outline is an
	arbitrary function of the perpendicular coordinate.
	Parameters: mattype axis lo hi maxradius insidefunc
	Not implemented in this release.

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