[Sidefx-houdini-list] noob procedural animation

Alex Czetwertynski disciple1 at gmail.com
Sun Feb 7 18:01:17 EST 2016


If you take the Copy stamping approach to doing this, you can randomize
easily using expressions, but you have to get your head around the concept
of stamping, which is tricky at first because it doesn't flow downwards.
See here for example

You can stamp any parameter pretty much, so number of pipes, direction and
speed of revolve are pretty straightforward.

When it comes to more hardcore animation, you will probably get a kick out
of CHOPS, even though they are not obvious at first, but overall the idea
is that you send your anmation channels to a whole separate environment
where you can procedurally modify them.

Let us know if this helps.  Happy to look at a scene file if you want to
put dropbox link one.


On Sun, Feb 7, 2016 at 3:07 PM, François Duchesneau <sidefx at trinix.ca>

> Hi Gary,
> It's a bit hard to know what you're missing but make sure you read enough
> on stamping, groups, attribute manipulation like promoting and all the
> different attribute xyz nodes in sop.
> When I started to learn Houdini for the first time (I'm still learning
> everyday) there weren't much tutorials around apart from a pdf on L-system
> and few others. However I've learned most of the foundation by looking at
> the example files that come with most of the nodes.
> For example, make sure you've been through a few of them on the Copy Sop
> node.
> This is a right place for asking questions. I myself prefer the mailing
> list however keep in mind there's no way to add attachments here.
> Cheers
> Francois
> On 02/07/2016 12:43 PM, Gary Jaeger wrote:
>> OK, I’ve been going through the docs and vimeo vids to start to get up to
>> speed in houdini. Good stuff. I thought I’d give myself a little procedural
>> test to see if I actually understood some basic concepts - and I failed.
>> Here is the simplified maya version of what I was trying to do:
>> https://www.dropbox.com/s/e0vj28oin3lpbke/maya_proc.mov?dl=0
>> But what I really wanted was to make myself a little tool with sliders to
>> control:
>> random scalex of the cross sections of the pipes
>> experiment with number of pipes
>> experiment with direction and speed of the pipe revolve
>> experiment with timing of the pipe’s rotations into place
>> I don’t necessarily want individual control of each element. Rather
>> overall speeds with variance.
>> I got as far as creating a plane, copying (or duplicating? Which is
>> better in this case?) and revolving them. But I couldn’t figure out the
>> random parts (I tried attribute randomize but it didn’t work). Also my
>> revolves ended up being a single group that I couldn’t see how to rotate
>> individually.
>> Anyway, I know I could build this just like I did in maya, with basically
>> all individual elements. But I figured there had to be a clean, elegant way
>> in houdini. Any tips to lead me down the right path?
>> Thanks.
>> (by the way, is this best place or should I be in the sidefx forums? I
>> prefer mailing lists but not really sure where the party’s at)
>> Gary Jaeger // Core Studio
>> 249 Princeton Avenue
>> Half Moon Bay, CA 94019
>> 650.728.7957 (direct)
>> 650.728.7060 (main)
>> http://corestudio.com <http://corestudio.com/>
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