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Showing results for tags 'pressure'.
Found 9 results
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Hey I'm stuck with something minor. I tried to create a simple popping balloon in vellum. If I use the edgefracture with a fracture curve (1 piece) it works just fine. If i try to use the "Initial Pieces" in the edgefracture sop it seems the whole thing breaks. Any idea what I could do to fix this? balloon_01.hipnc
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Hi, I wanted to ask about some of the hidden intricacies of vellum pressure. In particular I recently found out about the @pressuregradient attribute that determines the direction in which the object expands as pressure is applied. I wonder: How is it determined? I suspect something to do with Normals, but then when I visualise the attribute it tends to always have a rough relationship with {0,0,0} - why? This leads to strange inflation especially if an object is off-center and then it trends away from the origin, as opposed to away from its center of mass... Can it be manipulated in the solver? It would be nice to procedurally predetermine the inflate direction, although I'm not sure how to access or manipulate this attribute. Can it be manipulated per frame? If I have multiple objects that start in a rest position and their inflations happen one after another - one ball moves other balls out of rest position for example... Then once the ball that has already been moved starts to inflate, is it computing on the pressure attribute given at the start of the solve, or the one at it's current frame number? I could probably word these questions better and I do apologise, but at the moment it seems I have run out of places/videos to read/listen to. Thanks a lot for your help! Cheers.
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Hey ! I am trying to learn how to achive this kind of effect ! Do you have any idea / tips how to achieve something similar with vellum pressure controlled by an attribute that "inflate and then deflate" with this kind of random poping effect a grid shape like this one ? Credits : https://crea.st/Balloon-2019 Thanks in advance !
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Hello guys ! It has been now 3 years I'm working in the VFX industry. I saw a lot of different FX artist/TD so far and I came to the point that there is many ways of doing a pyro sims as there is artist to make it... From all those different artist, I met people doing amazing simulation from really complicated pyro solver and other with a only a few nodes. There is one specific topic I wanted to get thoughts from you guys was the using of the speed field from the length of the vel field versus the pressure field. People tends to use one or the other as a mask for turbulence, disturbance etc.. in their pyro. Both seems working farely well, but I would like to know more about the prons and cons of those technics ! Looking forward to read your thoughts ! Cheeers
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Hey guys, Im new to Houdini and I'm struggling to use the vellum balloon node, I've animated a fur ball falling and in the end is gets squashed by a box that falls in it. I want to then use the vellum balloon to inflate the fur ball again as shown in the sideFX website : https://www.sidefx.com/docs/houdini/shelf/vellumballoon.html please any help would be more than appreciated
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Hello there! After a few hours of playing with the Vellum Balloon object, I'm still trying to figure out how to recreate the effect hat was presented in the H17 Sneak Peek video (the one with the Rubber Toy inflating and being crushed). So far, I haven't been able to produce anything like that effect; playing with the pressure constraints doesn't really had the expected effect, and I'm quite surprised the solution isn't a little more straightforward. If any of you has any tips for achieving the Sneak Peek kind of inflating effect, I'll appreciate it. Thanks!
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Hi all I am using gasfieldtoparticle to bring in pressure but the pressure is showing unstable values if i check in spreadsheet geometry, suddenly goes to 0 and then again some values. Also if i enable pressure in guides, it is showing pressure is there on 2d plane grid but showing 0 values in spreadsheet. What i am doing wrong here? i have attached hip also. duckpressure.hip
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Hi,guys. Recently, i want built a tornado like pyro, a huge storm. The image come form man of steel,Alexander Lombardi Fx Reel ,https://vimeo.com/84196857 Before it , i have to list a better way to drive smoke rotate. So there is a simple test which include a tube source and a vortex force, i'm just add the vortex to the vel filed, after a while, you can see the smoke looks like a dish. I don't know if it was a nature shape, most like the air in middle was all been push out, so the air on top and bottom be attract in. So i have to find a way to disturbance to vel, first i want do it by pressure, high pressure air flow to low pressure lead to a wind, is it right? So i inject a custom pressure field, i not clear with how pressure working in pyro, i can export the pressure filed or modify it, but the pyro simulate not change at all, even i set the pressure to 0. Second way i modify the vel field directly, at the few frame of beginning, the vel field was direct to middle soon, i built a gradient field of the vel.y , if it great a value, then slow down the vel, it clamp the vel totally, although the smoke not rotate crazy, but it also lose the nature detail. I will keep optimize the second way. If anyone lead me a better way to built the tornado storm, or explain me how pressure working will be great. Thanks. pyro_pressure.hip
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Hey folks, Does anybody know how to use the "Goal Divergence" and the "Pressure" in the "Gas Project Non Divergent"? Whenever I try to inject a field the particles go crazy. Would be nice to get something like a explanation or example file. Thanks
