Hey @jsmack thanks for this! that makes total sense.
I tested with a time shift set to `$F-1` and seems to work well enough for me atm. Thanks for this!

Vray does have a velocity node in the box, but im missing something surely.

Their documentation says if the point count is the same, @v will be discarded and transformation/deformation will be used instead.
Velocity should work, without enabling motion blur. But it just outputs grey, until i 'attach some polys to the points', then i get a velocity output, but then my shader is broken and it takes too long to pre-render.

So for now, Ill keep the houdini attribute baked in. It will render so long as Houdini feeds Vray a color type attribute.

just tried:
i think thats all i ever needed
Waiting for renders .. oh the anxiety

Hello gang,
Having a bit of a headache outputting a proper motionVector AOV out of vray for a pointcloud. Never used this plugin, so its a bit of a mystery as to why it just keeps rendering grey. The pointcloud's point count is constant (try saying that outlout 3x in row), the manual covers that but im still lost.
So i decided to 'Houdini myself out of it', and successfully rendered the 'v' att into a color vector and that renders out great! ie. I see colors! Blue shouldnt be there, but I shuffle that to Green in nuke.
The question i cant answer atm is: is that pointing the right way round to properly blur the pixels in comp? I need to color correct my way into something that looks motion blurred, but should I not align vectors to camera first -from/toNDC()- or something along these lines?
Thanks a million for any light on the matter.

@mhspadez double check my post, i wrote 'filter range' node not 'filter frame'.
Set it to index and set the range you want to process.

What jurweer mentioned is `@wedgenum.0` will return the first position of `@wedgenum` in case you have 'preserve wedgenum' checked.

Worth mentioning 2 tings:
- you can right click on each wedge node and select 'generate node'. It will generate the attributes values and you can click on the dots to see the results/values realtime.
- check on the image below how to open TOP spreadsheet. Great help that is.

Hi, im new to this, im sure the guys will have a better answer for you in a minute. But wanted to leave me 2 cents too.

For names I tend use the Attribute Create node and create your name string there. Specially if you need to use substr() padzero() etc... . Id rather do it here and just reference the name att around the scene (i.e @fileDescription ).
But, if you can keep your name suffix as a simple index and pipe the data into metadata, Id say its a better practice in the long run.

As for the range. I think you need to keep ur total range, so 1-20, and use 'Filter Range' node to get your setup working as you expect it to.
Im guessing that if you reset your range each time you run it, from 1-10 and then 11-20, 'glitch_5.gif' will be 4 in (1-10) and 14 in (11-20). Or something around that line.

As for 'preserve wedgenum' i havent used it, but it seems to convert wedgenum from 'integer' to 'integer array'. So, say you have 4 wedge nodes in your graph and you check preserve on all the nodes. The first iteration of your graph, wedgenum should return the array (0,0,0,0) or the 5th iteration of the last node, wedgenum = (0,0,0,4)

Hope that makes sense,
Cheers!

Tom this is genius, thanks very much! I give that a run asap

For loop is the next thing I should dabble into definitely. Now Im curious to see how these 2 setups behave.
The overwriting aspect of the chain was not to blow the cap off of my hd with 'bgeos.sc' temporary sim caches.
Not sure im happy about dumping the JPGs as i have to manage the mp4 outside hou. But thats the decision for now.
The chain created some 300 sim variations overnight, hopefully i can scan thru the lot quickly and find 'sweet spot values'. Brute force approach
"With great power comes great responsibility"

Many thanks for the additional info mestela.
The setup is working as I have it. Just wondering what would be the best method for this.

Partition by index seems to be helping to achieve this:
I need cache1 to wait until capture0 is done.

When daisy chaining, TOPs seems to want to start cache1 while capture0 is still running. Cant have that for this case.

Hey!! seems i stumbled on something now.
Att remap was set to 0 to 1000 for density. Changing that to 1 to 1000 made the whole diff.
Will get back to this. CPU is 100% constantly now.
So many things to learn boy oh boy. Exciting

Tomas you legend ! Thanks for this, *Filter by Range* is not only the favorite answer but it also opened a whole new can of worms for me.
Thanks

Thanks for the quick reply. I'll keep digging into the infos, thanks for the link.
I had to fan out as series of nodes wouldnt behave as expected.
I need only one geo cache to run first, followed by that ogl node also running only once and rince and repeat that loop.
I couldnt see an option for the time being. That 'partition by index' node is my new best friend.
Im just certain im using it wrong - lol.

Still opened to suggestions if anyone has 2 cents to throw in.
Many thanks
Al

Hello Gurus,
I have been using this FLIP setup for a bit now and was used to seeing most of the sim times around the 5-6mins mark.
But when submitting the sim to the BG my eye caught a few lines running over 20 mins of sim time.
Granted im playing with Viscosity & Density. The ranges are roughly:
visc: 0.01 to 1
Dens: 1 to 1000

Within these values im contrasting the attributes. And that seems to be causing the inconsistency, just wondering why.
It causes a seemingly inconsistent trigger of 'Solving : GAS_Viscosity :'.
When that solver kicks in the CPU usage becomes spiky and the sims takes much longer.
When it seemingly doesnt kick in, the cpu stays at 100% all the way thru and these sims are the 5-6mins.
Both results behave as expected. i.e. they all have viscosity and density attributes.
Enabling OpenCL make no diff.

Just touching base to see if thats a known topic.
As always any thoughts on the matter, highly appreciated,
Thankious

Hello Gang,
Houdini 18.5 warrior here. Has anyone got a hack to make this work please ?
I would need to read mp4 wedges into cops to make a contactSheet. Houdini through out

This reply is more of a personal note, if thats ok. Just nicked and adapted this from another post in the forum.
I need to test it still.

Hello,
Currently suffering from "got only 1 machine to use" so i need to cook a recipe in a very specific order, as you do.
So the TOP docs just introduced me to 'partition by index'. Im just confused with why it ran the secondary branch first out of the box.
I needed to fiddle with a duplicated 'local scheduler' that sets 'inherit priority from upstream item'.
Im wedging a fluid simulation, overwriting sim geo cache, overwriting JPG from OGL capture, and generating a unique MP4 file thru ffmpeg.
Question is, is there another way to go about this? what is the correct approach for a task like this.

This setup currently works, but im write to the same files on disk for the most part of the process only to output that unique MP4 at the very end. So it feels im fighting against the tide a little.

Thanks a mi,
Al.

Hello,
Lets say i have generated 10 work items but already cooked 3.
Is there a way to explicitly tell the network to skip the first 3 indices?

Hallo everyone
Is there a way to make a ramp parm bias wedge values ?
Ex: Wedge 'viscosity' from 0.1 to 100, but having a 'ramp' that would drive the wedge to sample more around the min or max values accordingly.

Just realized (right click) 'create versioned asset' is a LABS addon and its not mentioned on docs.

https://www.sidefx.com/docs/houdini/assets/create.html [www.sidefx.com]

Brilliant! thanks vm

Hello Gang ! hope you all no less then fab.

Been changing UI colors recently, as you do, and wondering why these live under the sys admin folder struct.
Turns out I cant carry my favorite setup around with me as a freelancer, since i wont get 'admin privs' for most cases.
For some entries, seems I need to overwrite Sidefx's ones, which feels hacky.
The 2 files tweaked were:
folder:
- 3DSceneColors.dark (overwrite)
- UIDark_username.hcs (duplicate from UIDark)