Velocity Field Artistic Control

[6ril]

Hey,

I'm curious about different approach for artistically control the creation of a velocity field.

I've learn how to make nice noisy, curly etc.. fields, but when it comes to controlling them more, how would one proceed ?

could some curves be used as general guides for the velocities? And the perturbed slightly by some noise ?

I bet there's many ways to do it, I've seen some nice VolumeVOP work in some tut (volume trails), but I wondering about the best way to get real control.

thanks in advance for any input

 

[Juraj]

Hi,
I generally paint curves, then smooth them and resample for even points spacing. Then you can compute tangent vector attribute by Polyframe Sop. After that use Volume from Attribute SOP to put values into your vector volume. Set extrapolated parameter to high value to put values into most of the voxels. I also usually normalize this vector volume and then mix it with curl noise.

[6ril]

thanks Juraj ! I'll give it a go, as it sounds nice reading it

 

[rpdacosta]

Hi Juraj

 

Do you happen to have a simple sample scene with that method for download?

I'm documenting different ways to create custom velocity fields, did not come across that one before.

 

[Juraj]

Hi, sure, check attached file.

jt_vel_field_example.hipnc

[rpdacosta]

Thanks,
Much appreciated.