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    \$\begingroup\$ Won't the edges be slightly distorted thanks to 3d perspective? \$\endgroup\$ Commented May 9, 2015 at 4:04
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    \$\begingroup\$ With a height of 0.1 and an offset of 0.001 the disk is tilted by $\phi=\arctan(0.01) = 0.57°$, looking from the top the disks appear squeezed by a factor of $\cos(\phi) = 0.99995$, thats far less than a pixel. \$\endgroup\$ Commented May 9, 2015 at 7:20
  • \$\begingroup\$ @DenDenDo is pov-ray not able to put a camera at infinity? \$\endgroup\$ Commented May 10, 2015 at 4:03
  • \$\begingroup\$ @Random832 it can, with camera{orthographic location -9z}. But since the scene is basically 2D it makes no difference, you can even render it with a viewing angle 170 without any fisheye distortion in the result. \$\endgroup\$ Commented May 10, 2015 at 9:21