# Flow lines

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Is it possible to make something like Picture in Houdini? Must I use DOP or Particles for simulation?

Thank you!

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Sure just draw all the curves by hand.

Or check out this post on converting noise lines into geometry.

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This looks very similar to mangetic fields with a little bit of added swirl on top of one pole. Take a look at Alessandro Pepe's blog about magnetic vector fields. He goes through a lot of the math behind them, and it should give you some ideas for different ways you could tackle this.

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@Atom Thank you Atom! I will have look at your link.

@Gavin Thank you Gavin! I think you are right. It is similar to magnetic vector field. Will look at blog you mentioned.

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Nice work, that is a spot-on example file!

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I have been trying to extend this concept by calculating a wire radius attribute for each primitive strand. I want to follow this up with a polywire and have the radius decrease along the length of the each strand.

I think my code is close, but instead of decreasing along the length of each strand it decreases each strand. Can someone take a look at my code and tell me what I am doing wrong?

The primpoints() function is supposed to return the points in the order that they exist along the curve.

Edited by Atom

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Can you assign the radius to a ramp and control it that way?
More control.

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47 minutes ago, Atom said:

I have been trying to extend this concept by calculating a wire radius attribute for each primitive strand. I want to follow this up with a polywire and have the radius decrease along the length of the each strand.

I think my code is close, but instead of decreasing along the length of each strand it decreases each strand. Can someone take a look at my code and tell me what I am doing wrong?

The primpoints() function is supposed to return the points in the order that they exist along the curve.

thats one way:

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@petz Thank you very much! This is very great Method and exatly what I needed!

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On 1/17/2017 at 10:19 PM, petz said:

these are potential field lines drawn around positive and nevative charges. its pretty simple to implement

"Pretty simple" - if you happen to know everything. Great stuff yet again.

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On 19.1.2017 at 9:51 AM, eetu said:

"Pretty simple" - if you happen to know everything. Great stuff yet again.

thanks eetu but thats pure coincidence. a few years back i had to deal with this kind of stuff day in, day out for a project. so, even if i can´t look at flowlines, fieldlines, streamlines or whatsoever anymore, it seems to be still useful sometimes ...

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Wow, thank you so much petz, what a great setup!

I loved the field lines in Grasshopper and just recently wondered how to best go about it in Houdini...

Cheers,

Tom

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