@Tig and Chris, I had a play using view.vpwidth and .vpheight but don't understand why it doesn't work, I ran this code on the same drawing with and without a 'Camera' view and thought it might show you if Mac's handle things differently, or not. I thought using the second set of co-ords to output a file would work, but I'm doing something wrong so I'll leave that off this post. [code] > view = Sketchup.active_model.active_view # Determine the size of the design window h = view.vpheight.to_s w = view.vpwidth.to_s puts "Window dimensions; " + w + ", " + h # Display the locations of the four corners puts "Upper left; " + view.corner(0)[0].to_s + ", " + view.corner(0)[1].to_s puts "Upper right; " + view.corner(1)[0].to_s + ", " + view.corner(1)[1].to_s puts "Bottom left; " + view.corner(2)[0].to_s + ", " + view.corner(2)[1].to_s puts "Bottom right; " + view.corner(3)[0].to_s + ", " + view.corner(3)[1].to_s # Show the location of the window's center center = view.center puts "Center; " + center[0].to_s + ", " + center[1].to_s # Screen coordinates origin = view.screen_coords [0,0,0] puts "Origin; " + origin[0].to_f.to_s + ", " + origin[1].to_f.to_s Window dimensions; 1924, 1089 Upper left; 0, 0 Upper right; 1924, 0 Bottom left; 0, 1089 Bottom right; 1924, 1089 Center; 962, 544 Origin; 579.166591415118, 705.802307848725 nil > view = Sketchup.active_model.active_view # Determine the size of the design window h = view.vpheight.to_s w = view.vpwidth.to_s puts "Window dimensions; " + w + ", " + h # Display the locations of the four corners puts "Upper left; " + view.corner(0)[0].to_s + ", " + view.corner(0)[1].to_s puts "Upper right; " + view.corner(1)[0].to_s + ", " + view.corner(1)[1].to_s puts "Bottom left; " + view.corner(2)[0].to_s + ", " + view.corner(2)[1].to_s puts "Bottom right; " + view.corner(3)[0].to_s + ", " + view.corner(3)[1].to_s # Show the location of the window's center center = view.center puts "Center; " + center[0].to_s + ", " + center[1].to_s # Screen coordinates origin = view.screen_coords [0,0,0] puts "Origin; " + origin[0].to_f.to_s + ", " + origin[1].to_f.to_s Window dimensions; 1924, 1089 Upper left; 0, 135 Upper right; 1924, 135 Bottom left; 0, 954 Bottom right; 1924, 954 Center; 962, 544 Origin; 285.625823583734, 829.482222498574 nil [/code]

I did it by hand. I just made one full coil, then copied and pasted it to make a full series of coils. I've never tried any of the helix rubies. They do seem useful though, Chris