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Shadow from point source?
Owen_Murphy
Member Posts: 4 ✭
Hey! Does anyone know if there are featurescripts out there that generate a shadow of a part from a point source? I've tried all of the related featurescripts (Shadow, Outline, Project Body), but they all seem to project the edges of a part from a planar light source as opposed to a point source. I can certainly do this manually for each part, but it seems like it could be possible to make a featurescript that could do this for any arbitrary geometry. Any help would be much appreciated.
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Feels like a variation on the Solid Sweep problem, except you've got it in loft flavor instead. I've got some whitepapers that handle the swept case waiting for a rainy day to implement but this doesn't seem too far from that.
Wans't there a ray trace FS published recently? I remember it being discused here on the forum.
There is a feature that projects the shadow onto the surface.
But the shadow is for an infinite far light source, so its not quite what you're trying to do.
https://forum.onshape.com/discussion/comment/61460
Custom FeatureScript and Onshape Integrated Applications
From @EvanReese
https://cad.onshape.com/documents/de8cbd559bd2dcc347c38ff3/w/3603b1286161ccca20f2e841/e/b1db47e3a33d6461f8e732c1
Simon Gatrall | Staff Mechanical Engineer | Carbon, Inc.
Optics won't be much help in casting shadows from a point source and I'm not aware of a feature that will. This kind of problem seems related to isoclines, but not perfectly so. One idea to force FeatureScript to do something like projection from a point is to scale the input body from the point till it is fully through the plane you're casting onto, then lofting between them somehow (face-by-face, splitting as needed?), which means I agree with @Derek_Van_Allen_BD that it's kind of like a Body Loft operation. For simpler things like your example, you can do this manually the same way, like this. For curvy shapes, i'm not sure yet.
https://cad.onshape.com/documents/3ca15967b4931ac0ef7acfe1/w/c5cf855c1a9eb71dbe13c59f/e/428f838a03d7331e574e518a
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