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animatrix

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animatrix last won the day on January 1

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About animatrix

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  1. Hi, You can do this by directly using the @primnum attribute in VEX. So you can use the same thing in VOPs. That will refer to the primitive using that point. In case of multiple prims, it should be the first one I think. In that case you can use the pointprims function.
  2. Hi, You need to offset the hitpos using the opposite direction of the intersect normal, so it avoids the originating face.

  3. adding 2 values in same parameter

    animatrix replied to Rival Consoles's topic in General Houdini Questions

    Hi, You have to use 2 group nodes. I asked for a mirror feature long ago.
  4. Hi, You can use the dihedral function: vector p0 = point ( 1, "P", 0 ); vector p1 = point ( 1, "P", 1 ); @orient = dihedral ( { 0, 1, 0 }, normalize ( p1 - p0 ) ); Position wise it's up to you if you want the tube to sit on point 0 or point 1, be centered to the line, or just rotate.

  5. Pragmatic VEX: Volume 1 [4K] [H19]

    animatrix replied to animatrix's topic in Education

    Exclusive bonus content is being developed for Pragmatic VEX: Volume 1 that includes 2 brand new sections! It will show how to break down and solve new complex technical problems to get aesthetic results. The last section is based on a Siggraph paper. This content will be freely available to existing owners of Pragmatic VEX: Volume 1. Estimated length is between 1 and 2 hours of video content. Happy new years everyone!
  6. Hi Anna, Self studying is one of the most proven methods in VFX as many of my highly skilled colleagues all learnt Houdini and VFX themselves often alone by experimenting and watching tutorials. The trick is to not replicate the same effect verbatim but go beyond what's shown and take it further. That alone will teach you so much. It's now easier than before with countless Houdini tutorials you can find online, both free and paid.
  7. There are many ways to do this sort of thing, but one thing I would recommend is using the convex hull geo to compute it for speed. In this case it already looks convex but I am talking in an HDA sense. Also there are many assumptions and shortcuts one can take. For example to compute an MVB (Minimum Volume Box), at least of the faces in the convex hull will touch one of the faces on its MVB. Then there is brute force methods searching on all faces, vs other clever ways but sometimes brute force is actually faster.

  8. Evenly-spaced streamlines

    animatrix replied to sessionbeer's topic in Effects

    Hi, I cover these ideas in detail in these videos: https://www.sidefx.com/learn/collections/pragmatic-vex-volume-1/ Hope that helps.
  9. If you want to do that in VEX, you have to use a for loop inside VEX to do the accumulation.
  10. Hi, You can use the Solver SOP to accumulate data from the previous frame. Alternatively you can also use a For Loop network in Feedback mode.

  11. workflow for modeling this tiny planet

    animatrix replied to rickvdvulkaan's topic in Modeling

    Another good ol' trick is to bend a grid twice to turn it into a sphere:

  12. Cant close cracks in subdivide node

    animatrix replied to andrewp2010's topic in Modeling

    For reference I implemented a modified OpenSubdiv Subdivide node that closes the gaps robustly. Just fusing is not robust FYI. With my implementation you have the speed of OpenSubdiv while getting better topology. Houdini Catmull Clark runs in exponential time if I am not wrong. That's why I had to use OpenSubdiv algorithm. This was a big problem I had to solve when I was working on the Dark Phoenix crack setup that has incredibly high adaptive detail around the cracks (Level 13 subdivision). You can read more about it here: https://vfxscience.com/2019/07/12/x-men-dark-phoenix/ This is also part of the VEX course I created in case anyone is wondering how to do it. It gets quite involved. Some more detail about the process and comments from the legendary Jeff Lait himself here: https://www.sidefx.com/forum/topic/42633
  13. MISSMMb started following animatrix

  14. Pragmatic VEX: Volume 1 [4K] [H19]

    animatrix replied to animatrix's topic in Education

    Pragmatic VEX is featured on ASUS ProArt showcase series! You can see the Supercharged extension in action.

  15. Pragmatic VEX: Volume 1 [4K] [H19]

    animatrix replied to animatrix's topic in Education

    Pragmatic VEX is featured on ASUS ProArt showcase series! You can see the Supercharged extension in action. https://www.youtube.com/watch?v=3Q5Rn86H_gE&ab_channel=ASUS

  16. Supercharged H18 GUI (TouchDesigner Style)

    animatrix replied to animatrix's topic in Finished Work

    https://gum.co/fxsup I have recently updated Supercharged to work natively with Houdini 19. It's now more robust thanks to the built-in viewport Qt handle added by SideFX. Due to this, this version is not backwards compatible. I was on the H19 beta so I tested the new Qt handle and it allowed the overlay network editor to update and track viewport changes a lot better. That's why this is an important update. It should also work better on some Linux distros. There will be some more upcoming changes and finally an updated showcase video and an in-depth video showing all of the available features.
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