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Hello! Is it possible to model cylindric surfaces (x- or y-aligned as well as rotated around z by a given angle) with rayoptics? Specifically, I am trying to model a system inspired by the Wallin patent US2890622A (two counter-rotating cylindric lenses used to correct the astigmatism found when focusing a spherical lens behind an anamorphoser). Digging through the code I couldn't find anything that pointed me into the right direction so I figured I'd ask before attempting to knit my own. Thanks a lot in advance and have an excellent day! |
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Replies: 2 comments 5 replies
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Hello Jan, x and y toroid surfaces are available in the profiles module. You can set the sweep radius to infinity (sweep curvature to 0) and then you have a cylinder. The YToroid can be used as a Y Cylinder by setting To do intermediate angles, I would recommend using gamma rotations on the parts with the cylinder surfaces. The DecenterData is an attribute of the Surface and is specified by the surface offsets and euler angle rotations. A gamma Euler angle rotation can be used to "clock" an element. Hope this helps; feel free to follow up. Mike |
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Hello Mike, Thanks a lot! That was exactly what I was looking for. Am I seeing this right that the rotation isn't represented when plotting the model? Not a huge issue if that's indeed not the case, since it would be just to help me with visualisation. |
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Yes, you are right that the model plot doesn't include the gamma rotation. Someday I'll have to implement a 3D view... |
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Hi Michael. @mjhoptics I have trouble realize what is the difference between XToroid and YToroid. Initially, I thought it is the orientation of the cylinder. But the raytracing of the XToroid and YToroid lens were the same. I would expect one to work as a lens and another as a glass plate. Or am I missing something? Petro. |
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Petro, |
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Hi Mike @mjhoptics , First off, thank you so much for creating ray-optics! I am amazed by the amount of effort you've put into this project, it works wonderfully and I've learned a lot playing around with it. I am resurrecting this thread because I've encountered some unexpected behavior using XToroid. I've attached a .pdf of a jupyter notebook where I compare the spot diagrams of optical systems using YToroid and XToroid objects. YToroid produces the result I would expect (light is focused in one dimension), but XToroid produces a very different result. I would expect the spot diagram to look like a 90 degree rotation of the YToroid result, instead, it yields a skewed pattern that appears to be rotated only ~45 degrees and does not focus as tightly as the YToroid example. Do these results make sense to you (i.e., I'm doing something wrong) or do you think there is an error with the XToroid class? Cheers, |
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Hello Mike @mikejaris, |
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Hello Jan,
x and y toroid surfaces are available in the profiles module. You can set the sweep radius to infinity (sweep curvature to 0) and then you have a cylinder. The YToroid can be used as a Y Cylinder by setting
cRto 0. There is a XToroid that can be used similarly.To do intermediate angles, I would recommend using gamma rotations on the parts with the cylinder surfaces. The DecenterData is an attribute of the Surface and is specified by the surface offsets and euler angle rotations. A gamma Euler angle rotation can be used to "clock" an element.
Hope this helps; feel free to follow up. Mike