![]() ![]() The surface can be placed at other locations, including the z position of the lens, but a Boolean object must be constructed in order to create a window for the sampling ray to intersect the desired surface. The simplest way to do this is by adding a rectangle object with X and Y Half Widths of 7.5mm, and located 50um in z from your front surface (this ensures that manufacturing rules are adhered to). The entire 15x15mm area sampled by the macro needs to be fully specified so, for example, a radial optic must also be partnered with a square dummy surface in order for the sampling ray to intersect a surface in the corners of the sampling region.
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