Quick Tip: Modifying Curl Noise (Season 2 is here!)

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Hello people of the internet! After a tremendous start followed by a small hiatus to prepare new tutorials, setups and renderings we’re back for a second season!

We’re thrilled by your feedback and incorporated some of it into this season’s tutorials. We’ve got topics ranging from advanced VEX to quick live savers for your workflow prepared for you. Let’s start without much ado and a quick tutorial on getting one particular effect: Particle trails that look akin to a printed circuit board.

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  1. Jim B says

    Welcome back! And thanks for your continued contribution to the incredible Houdini community

  2. Matthew Vonnegut says

    is there any difference in the Volume VOP between Parameter and Bind Export ? Are there any pros/cons ?


  3. Matthew Vonnegut says

    Hey sorry I have one more question :))
    I did a quick test to check that in fact the Curl noise vectors were getting normalised… umh it didnt really do it.
    You can check this scene: http://bit.ly/2fyTyg8
    Basically it’s your same setup:
    + created a N attribute from volume
    + computed the length as a new attribute
    If you check the Geometry Spreadsheet for the compute_length node, you will see that the length is not 1. It does change if you normalise the curl noise but it’s never one nor is it uniform.

    What am I doing wrong ?


    (you should turn on show normals to have a visual output)

    • Matthew Vonnegut says

      found the reason. the points in the grid – although were matching the density of the volume – were not actually at the exact centre of each voxel.
      adjusted the grid size to match the centers of the voxels and computations are correct :))

      for those interested: http://bit.ly/2fySfOc

  4. Nirosh B says

    Please do it in Cinema 4D …as well..pl…pls….pls…

  5. Alex Czetwertynski says

    How would you give this some movement? Add some noise to the points on the grid with a VOP SOP?

  6. So I have a motion captured man in my scene which I applied this curl noise to and I really like it. My only issue is when he animates the curl noise doesn’t stay. So for example at frame one the curves look different than in frame two because he’s moving through the volume. Is there anyway to pull the generated curves from frame one, and keep them moving and attached to the mesh as it goes on with the animation?

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