Jump to content

Maya to Houdini scene conversion help


Recommended Posts

Hey all.

I'm a maya user who has slowly been getting into houdini, and I've finally come across a scene which I don't think can be accomplished by maya. So, I'm looking for a bit of help in recreating my scene in houdini. The maya particle system involves a fair bit of per-particle coding, and I'm not sure how to achieve this in houdini.

Here's the scene run-down:

a) I have a dynamic curve (maya hair curve) and it is undulating with turbulence. - fairly sure I can work this out on my own .

B) I am animating a particle emitter along a curve - this I can do.

c) The particles emitted are 'goaled' to the closest point on the curve - Not sure how to recreate this? A creep pop perhaps?

d) The strength of the 'goaling' is relative to the particles distance from the curve when it comes to rest (ie the particles which come to rest close to the curve are goaled more strongly than the ones which come to rest further away. - No idea how to achieve this in houdini.

e) Small clumps of particles have curves joining the particles together (like a molecule) - I couldn't achieve this in maya, which is why I'm switching over to houdini. I believe I need to use an "Add" sop with particle grouping?

Any help would be very much appreciated!

Link to comment
Share on other sites

waaaay over my head. lolz.

but i had to comment on your reel.

wow. freek'n impressive bro.

wackyweezel - joel goodman reel 2010

as for your question... maybe there is a hint or clue in this video by peter quint:

PQ Dynamic Spheres vimeo

the 'molecule' and the particles you described made me think of PQ's vid.

good luck and awesome reel!

Link to comment
Share on other sites


I'm attaching my half-assed effort to reproduce it before I head out.

I'll leave adding lines joining the particles together to others :)

I also come from doing particle work in Maya, and as you have a ton more tools that you can utilize in Houdini,

it's really better to try & imagine a solution in the Houdini context.

Like what I'd try to do in Maya with particle-goals, here I did using Volume Gradients as velocities.

As you can see in the file, I converted the line into a tube, calculated a Volume Gradient out of it (updates every frame obviously),

and added that Gradient to particle velocities in a VOP POP.

To adjust the strength of the goaling, I again made use of the magnitude of the Volume Gradient, modifying & multiplying that into the added velocity.

Good luck,


Link to comment
Share on other sites

Hi Cosku, thanks for the reply. (and smaugthewyrm, thanks for the showreel complement!) I thought it would probably be more helpful if I uploaded a playblast of what I'm trying to achieve.

Surging particles(12:50 Sydney time: Vimeo currently queued for convertion... will take another 25mins before available)

In addition, I need lines to be dynamically drawn between some of the particle making clumps of "molecule-like" structures.

I think your test scene may give me some clue about the curve goaling, but any further elaboration would be appreciated!


Link to comment
Share on other sites

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.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

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

  • Create New...