Fluid path on topography

Replies to This Discussion

Permalink Reply by Daniel Kautz on October 29, 2011 at 9:42pm

I tried an experiment with kangaroo which isnt a very scientific way.

 

1. Make a grid of points.

 

2. Apply gravity to these points a constant downward vector in kangaroo.

 

3. Thicken your 3d surface to make it a brep. (a single surface wont work). Set this as a collision object and position it underneath your grid of points.

 

4. Start the kangaroo animation to drop the points onto the surface (you can mess with bounciness, etc)

 

You can apply particle trails (a kangaroo utility) to the output particles from kangaroo to make a spline of their path.

 

http://causalocuta.blogspot.com/2011/07/rainfall-simulation-kangaro...

 

You might try subdividing these paths to get points and plug these points into a metaball patch

to get the blobbiness of the example, but others would be able to explain that better.

Permalink Reply by Martin Dembski on October 30, 2011 at 1:27am

Hi Lara,

 

you can also have a look on this discussion.

Benjamin Golder share there a definition doing exactly what you want.

But you need the Grasshopper Python plug-in and also Rhinoceros 3D 5 beta to run this definition.

 

Best,

Martin.

Permalink Reply by Lara Behmoaram on October 30, 2011 at 7:35am

Thank you very very much!

I will need some time to get my head around these methods and apply them but hopefully, if i can work them, they should be very helpful..

 

Daniel, do you know if this method would work with a polysurface on rhino?

Permalink Reply by Daniel Kautz on October 30, 2011 at 2:26pm

Lara, if it doesnt work, you can take your polysrf and extrude it downwards and use the thickened version as the collision object. It would be the same with a nurbs surface.

Permalink Reply by Daniel Piker on October 30, 2011 at 2:43pm

It might also work to constrain particles to a mesh (using PullToMesh). I think this may be a bit faster than using surfaces

Permalink Reply by Lara Behmoaram on January 28, 2012 at 6:23pm

Hi Daniel (K.),

I have been trying to set up a definition, according to your instructions but wasn't really successful.

Would you mind having a look at my script to tell me what i am doing wrong?

This was my first kangaroo trial so no judgement please.

Attachments:

• flowpath trial.ghx, 140 KB

Permalink Reply by Daniel Kautz on January 28, 2012 at 6:58pm

Hi Lara,

You were close!

I made a few adjustments to your patch and got it working. You dont need to use the constrain srf component. Also, the collidesrf component is a Kangaroo force, so it needs to plug into the list of forces for Kangaroo instead of geometry. Also the list of forces for Kangaroo always needs to be flattende.

Try this out!

Attachments:

• flowpathtrial edit.gh, 6 KB
• flow trial edit.3dm, 65 KB

Permalink Reply by Lara Behmoaram on January 29, 2012 at 5:27am

Hi,

Thank you so much!

The only part i couldn't get to work was recording the trails. For some reason, the trails seem to show null values and the particles don't get recorded. Any guesses why this may be?

Permalink Reply by Martin Dembski on January 29, 2012 at 5:53am

Hi Lara,

for me it's working.

Maybe you need to install the latest Kangaroo release if you don't have it already.

And if you are just interested in this fluid path stuff you can also have a look on the SPM Grasshopper plug-in it can do the same.

Best,

Martin.

Attachments:

• flowpathtrialedit.gh, 6 KB