generative modeling for Rhino
create spiral from point
Hello guys,
I am quite new to Grasshopper and I am working on some simple spiral. I have set the turning radius according to the x,y coordinates from a point. However, I couldn't make the spiral starts exactly from position of the selected point. Does anyone know how to do it? Any help/comments are helpful and deeply appreciated!
spiral.gh This is the definition I have if it is helpful.
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Replies to This Discussion
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Permalink Reply by Hannes Löschke on -
Find the angle between the point and the world coordiantes. Then rotate the spiral.
Angle can be defined in two directions in the circle. A is always the smaller of both. Need to determine which one to use to go through the whole circle.
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spiral.gh, 8 KB
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Permalink Reply by Terence Lin on -
Thank you very much! That is very helpful! However, the rotation seems only works for single point. When I select multiple points, sometime the start point of the spiral is mirrored along either X axis or Y axis. The "Filter" box gives the error saying "Filter component only operate on a single filter index value." I am guessing the definition couldn't define which angle is the smallest? Any suggestion?
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Permalink Reply by Hannes Löschke on
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You're right. Filter only works as a kind of selctor switch in the definition.
Here's a quick and dirty solution. I'm sure there is an equivalent component for what I'm doing here... just tool lazy to go and search for it. ;)
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spiral_multipoints.gh, 9 KB
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Permalink Reply by Terence Lin on
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Thanks a lot! Appreciate your help! It works like a charm!
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