Grasshopper

algorithmic modeling for Rhino

Hi,

I'm working with the field objects and trying to understand their logic. For the point charge component: what do the units for charge and decay correspond to? For example, if my charge strength is -20, and my decay is 0.5, then how can I predict the active distance and falloff curve? If the decay corresponds to an exponent in the equation, does this mean I could get maintain a constant vector at a particular point by varying the strength geometrically?

Another question: I would love to use the vector field element for parallel forces (eg the whole field is aligned to z axis), but there doesn't seem to be any decay, so the field cannot be put in interference with another vector field element in a constructive manner. The resulting field is just the difference of the two vectors regardless of where I evaluate. Is this by design? Is there a way to do directional fields that decay?

Thanks!

~i

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Replies to This Discussion

Also experienced it difficult to find what the component parameters signify so here's for future googlers. As far as I can tell by testing the formula for field strength in Grasshopper is:

Strength at point = Charge / ((Distance from field origin)^Decay)

Decay should normally be 2 for point radiation in 3-dimensions:
https://en.wikipedia.org/wiki/Inverse-square_law

The second question is a very good point, i would also like to know the answer to this!

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