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Manually I can make a 4x4 flipbook of the viewport in the flip book settings, but I can't see in opengl node (ropnet) any option to make a flipbook of the viewport, I see only camera, and it chooses only 1. any idea how to make a flipbook with 4x4 grid in an automated way (I trigger the opengl with a TOPs rop fetch)?

Nothing I am aware of and it doesn't even make sense. What you can do is to use Edit Material Network LOP if you see the material in Solaris. But I recommend to edit the material on one place only.

Thank you so much. But this method doesn`t solve my problem

First up apologies for digging into a very old post here.. I've recently been looking for something similar, so it's great to find this thanks @Atom ! This somewhat works in the viewport comment by displaying the current time, but for me it does not update per frame when flipbooking or dragging through the timeline. @nikosgr00 Your solver method is working well and does update per frame when dragging the timeline, as well as when flipbooking. Between these two versions I'd love to know if it would be possible to instead of showing the current time of day, it could show elapsed time starting from zero seconds. Any ideas on calculating the math behind that?

Search for houdini wingtip vortices https://www.sidefx.com/forum/topic/93890/?page=1#post-410577

I'm trying to create a fighter jet downwash similar to that in Top Gun: Maverick, but I'm not satisfied with the swirls compared to my reference. I am attaching the MOV of my output, reference, and HIP files. https://www.youtube.com/watch?v=MkIx7mG8oos https://youtu.be/ql2oHbGsG1Y?si=U-t-BObuF8B9-44p&t=156 downwash.mov downwash_turbulence_forHelp.hip

This seems to be strange: If it is a dense field, density and temperature would use the same amount of memory, but velocity is built from three floats and should be three times bigger. So I suppose your workflow to save the files is somehow incorrect. e.g. in my test, density is about 57mb, temp is 74mb and vel is 584mb.

I'm trying to render Karama XPU in solaris on a scene with 2500 USD instances and I repeatedly get this error message "KarmaXPU: device Type:Optix ID:0 Name:"NVIDIA GeForce RTX 5090" has registered a critical error "Unable to create CUDA context "CUDA_ERROR_ILLEGAL_ADDRESS" (maybe old driver? requires 570+)", so will now stop functioning. Future error messages will be suppressed" Sometimes it renders ok in the viewport but often fails and only renders on cpu, and wont reset unless I reopen the file. If I try to render though the USD render rop, the GPU sits idle and the CPU works at 100% I've tried updating drivers and going back to old drivers (this is the only solution I could see people posting online) but it doesnt seem to help. Removing textures doesn't seem to help and reducing instance count doesn't seem to help. I thought it might be a VRAM issue but the VRAM is only operating at around 30% when rendering. Any suggestions would be greatly appreciated, I'm at a bit of a loss as to what to try next.

I dont know how you save velocity, but usually you need to popst proccess adjustment for velocity and it save you space.

Oooo yes that is interesting. Thank you. I will give this a go

any help ;( ?

Here is why: These are a few tests for a tiny sim (DTV: Density and Temperature and Velocity). For the same simulation, same frame, if you save: Density alone -> 55mb Temperature alone -> 55mb Velocity alone -> 55mb Theoretically I should be able to get away with 165mb total storage if you mix floats you're still good: density and Temperature: 55mb + 55mb = 110mb (exactly as simulated and saved, exact sum) Up till now, I should be able to use only 110mb (density & temperature together) + 55mb (separate velocity) = 165mb total storage Once you feel like mixing apples and oranges, funny things start happening: Density (float) + Temperature (float) + velocity (vector) = 425mb total storage (I repeated the test 3 times because I couldn't believe my eyes) can you explain the difference between 165mb and 425mb? (425/165=2.5)? Try repeating the test and see for yourself. Can you explain to me why I should buy 2,5 times the storage instead of 1 just because floats and vectors are being mixed in one output? In case of a large simulation, instead of paying for only 1 drive, you need to pay for 2.5 drives. Scale that cost up for more servers / farm, and your numbers start having a louder voice. Instead of 20 drives you need 50 drives, for the same bloody sim, it gets funny real quick. No one paid attention so far (I wonder why) to the fact that the dopimportfiels is mixing apples and oranges at a very high dollar cost for no reason + ridiculously 3x longer geo saving time, It needs to be fixed by having 1 simulation but the dopimportfields offers 2 outputs, one for floats and one for vectors, from the very same simulation (no re-sim): floats separate (all of them): Density, Temperature .... vectors separate (all of them): velocity ... and just for arguments sake, I did resim, and it was way faster to resim twice (float separated from vectors) than to sim once (mixing apples and oranges) because saving geometry takes forever when you mix apples and oranges. But this is not what I want, re-simming is not the way to go, I need saving separate floats and vectors from the same simulation. Is it possible to do it with PDG (2 simultanuous dopimportfields for the same frame from the same sim)? or to change the dopimportfields node?

This is not good way because in this case you will have 3 simulations. You can cache all together and than take field you need and work with it. If you still need separate files(I dont know what a spesial case you have) you can save it from cached VDB to save a lot of time.

Hi rev, you could paint on the large terrain and transfer its mask to the smaller tiles using a volume wrangle. write_mult_volumes.hip

I have a smoke sim in a DOPNET and a Dopimportfields initialised for smoke showing density, vel, temperature. is there a way to run the simulation only once and save separately the density, vel and temperature, each in a separate file cache? is it possible to do it with several dop import fields nodes? or somehow have as many outputs to the dopimportfields node as the number of fields, e.g. Density has its own output density, and the same for the others each with its own output? and then a file cache with 3 inputs each saving separately one of the fields

Hey guys, Is there any way to move or offset a texture along a curve while keeping the curve normal direction? Basically, I want the texture to slide along the curve ( breaking or rotating... Any suggestions would be appreciated. Offset along Curve.hip

Hi, I am trying to build a book generator where I can have multiple books leaning at an angle onto each other, the problem is I am not able to figure out a way to have the books touching, without using RBD or any simulation. I have tried projecting a point at the top corner while also having the pivot there, then trying to project via a ray and have it on the previous book iteration but I can't get it working. I am a beginer at Houdini so I don't know VEX and am struggling with it since I tried looking at an attribute wrangler as well. Does anybody have an idea on how I could have each book touching the previous one perpedincularii based on the top pivot? Many thanks BooksGenerator.hip

Hi all, I've been sharing this in various other places but thought I'd post it here as well... EVE - The Excellent VEX Editor for Houdini. EVE provides a modern editor experience for VEX wrangles right within Houdini. This is most notable for autocomplete (never guess the order of function arguments again!), displaying help and error messages (displayed as tooltips), but also small quality of life improvements such as rainbow brackets and adjustable fonts. EVE serves as a drop-in replacement for Houdini's existing parameter pane. It's available on the EVE website, with 2 different purchase options (Creem and Gumroad), which should both work equally well. Recently added features are support for parsing local information (such as your own function definitions and variables) and includes (e.g get autocomplete for all the functions in math.h!). I'm working on additional features and am very happy to get user feedback. By the way, EVE 1.0 is $19 for a 1-year license and $30 for a perpetual license both including any updates. Thanks!

I would like to create a large scale terrain using height fields. Something that is too big to be done in just one chunk. I have been going over different ideas on how to go about doing this but then I end up at a road block at some point. Something I either cant, in the moment, think of a way around or might need something that I am unaware of yet. What I would like to have is a large low rez height field. Here I want to put in the basic rough terrain. Just a "block in". Then that large terrain is spilt up into 10x10 chunks. Up until here I dont have a problem. What I would like to do is to select several of these chunks and use a heightfield paint to paint across them. How ever only the first chuck will be painted on. Any thoughts on how to change this?

ok, I've found out, it get's this error when E gets value 0 from multiplication. If lowest number is bigger than that, it works.

Hello, I'm using MPM solver. I'm using cutom noise ramp to mulitply E attribute. When mpm source is set to chunky it works. When I switch it to sandy, wich also have E attribute, when I run the sim I get errot that says NAN particle velocities were detected during integration! When I turn off noise ramp on E, everything works fine. I don't get it why multiplying E causes this. Any body knows a work around or had the same issue?

Hello all, First post here. I've been really curious how this person did this effect - https://www.instagram.com/p/CrTdgZTsqjE/ Curious how to make those cool looking animated shape and also how to keep it moving in a sim. So far, I tried some voronoi fracture and also some falloff based+blast to create the animated shapes but I can not figure out how to keep it moving in a sim. Any ideas please?

For Unreal Engine, the problem come from Epic Games. MaterialX materials must be .mtlx file referenced in USD. See this topic https://forums.unrealengine.com/t/usd-encoded-materialx-updated-for-ue5-6/2378503 From Unreal documentation, https://dev.epicgames.com/documentation/en-us/unreal-engine/interchange-materialx-reference-in-unreal-engine They recommend to use Substrate Materials which is working pretty well if you respect the version of MaterialX library used in UE5, version 1.38 (Houdini 21 use v1.39 with some new functions not present in v1.38)

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fencer Thanks for the very simple solution! fast_shrink2.mp4