syntax_notes

*action species[(state)] face action
	species: all
	face: front, back, both
	action: reflect, absorb, transmit, jump, port, periodic

*rate species[(state)] state1 state2 value [new_spec]
	species: all
	state1/state2: fsoln, bsoln, front, back, up, down
	value: rate constant or rate coefficient

*polygon face drawmode
	face:front, back, both
	drawmode:none, vertex, edge, face

*panel shape float ... float
 	shape:rect, tri, sp, cyl, hemi, disk
	panel rect +/-axis corner_point corner_point corner_point axes_dim axes_dim		
	panel tri corner0 corner0 corner0 corner1 corner1 corner1 corner2 corner2 corner2
	panel sph center center center raidu slices(longitude) stacks(latitude)
	panel cyl axis_start axis_start axis_start axis_end axis_end axis_end radius slices stacks 
	panel hemi center center center radius out_vec out_vec out_vec
	panel disk center center center radius vec vec vec slices