Hi,
I have a circular STL file with shapes in. I would like to use this as a mask in front of a simple telescope (I am using one of the example files (schmidt-cassesgrain.zmw)). I have entered a NSC surface and set the face to absorb, however, while the rays look correct on the 3D layout I cannot get the MTF or image simulation to work.
Any help or advice would be very helpful!
Best answer by Mark.Nicholson
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+3
You don’t say why they don’t work, so my guess is that the chief ray is being terminated by the mask and so is not available as a reference for these calculations.
If you can, try using the Slide surface to read a bitmap in, instead of the STL object. A slide object will put the ray intensity to zero if the ray is fully absorbed, but the zero-energy ray is still available to be traced and used as a reference by the diffraction calculations.
You could also try the Geometric MTF and Geometric Image Analysis calculations.
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