# Flow lines

## Recommended Posts

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

Thank you!

##### Share on other sites

Sure just draw all the curves by hand.

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

##### Share on other sites

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.

##### Share on other sites

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

##### Share on other sites

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

##### Share on other sites

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
##### Share on other sites

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

##### Share on other sites

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:

##### Share on other sites

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

##### Share on other sites

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.

##### Share on other sites

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 ...

##### Share on other sites

• 2 weeks later...

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

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×