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Showing results for tags 'activation'.
Found 7 results
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Hi people, I'm working on a simulation where, as saying in the title, pyrosourcespread is driving the activation for my vellum sim. Eveything is doing well, BUT for some reason, the attribute @totalburn that i'm using to drive the simulation, back to 0 sometimes. What can I do to keek my total burn to the same level and never back to an inferior value that create this kind of "stairs effect". Look at my test file. Thanks for your help and knowledge. Nik SPHERE.hip
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I am trying to blow up multiple groups of particles in a sequence.(boxes of confetti exploding at different times). The activation isn't really the problem as I can use a sop solver within a dop to activate the particles group at different time. The issue is to give them that "initial velocity" at activation time. The only method i found that is working to achieve the effect, was to actually import and merge many popobject and "activate" them one by one in a sequence , with the velocity attribute created at sop level This solution is of course very inconvenient. I attached a clean file, with just the different group all popping at the same time. a solution to have them delayed one after the other would be very welcome I just can't find an elegant method which works procedurally. Thank you for your help confetis.hip -
Hey, I got a really stupid question but I can't get it to work ATM. I want to put an expression in e.g. a fluid source node in dops. Something like "if($FF)<225, 1, 0)". So when smaller than frame 225 take 1, else 0 (or another expression like a sin curve). What am I missing here?
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Hello, I recently downloaded the Redshift demo for use with Houdini, and I've been having trouble following the documentation on how to activate it for proper usage. It reads: Run the exe file. After installation, Redshift and the Houdini plugin will be installed in the C:\ProgramData\Redshift default folder. The Houdini plugin will be in the subfolder Plugins\Houdini. Log files, your license file (if using a node-locked license) and the Redshift preferences file are also stored in C:\ProgramData\Redshift. To use Redshift with Houdini, you'll need to edit your houdini.env file to include the following lines (Note the direction of the slashes!): HOUDINI_DSO_ERROR = 2 PATH = "C:/ProgramData/Redshift/bin;$PATH" HOUDINI_PATH = "C:/ProgramData/Redshift/Plugins/Houdini/15.5.480;&" However I am unable to find the Houdini.env file in question anywhere on my computer. I've looked under Users>(Me)>Documents>Houdini15.5 ----- However I am still unable to find the .env file under this specified directory. I also have hidden files and folders checked ON with my machine. The documentation for this plug-in doesn't seem to specify where this file is exactly. Can anyone please help? This is quite frustrating, I have no idea what a .env file even is to be quite honest. Thank you! -
Hi guys, Currently, I am working on a project where I need a way to get a fractured geometry cloth simulation to activate each fracture piece according to the color attribute. The plan is that a curve, representing the path of another object's motion, will pass through the fractured object causing it to begin floating away and disintegrating from the point of impact/contact. I am still learning Houdini and have only been working in it consistently for about 6 months or so, but I have the effect mostly working with the disintegration and cloth simulation and such. What I can not seem to figure out is how to activate the pieces as the color envelopes the object. I have found other forums posts that have given some good routes (That's where I got the color transfer route to where it is currently at) but they are for fractured RBD objects and I have not been able to get those to work for a cloth object in DOPs. I have the color working in SOPs but just need help getting that into DOPs and controlling the activation of each piece. I have created an example file and attached it below. Thank you in advance for any help/advice you guys can provide. Thanks, Dustin P.S. As a bonus problem solve: one piece seems to get stuck on nothing, as if it is constrained to an invisible point in space, but it has no constraints. I am not sure why yet. I'm going to keep looking into the issue, but if anyone knows why please let me know. Thanks. ClothFracture_Test.hiplc
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Hey Guys, My deadline is coming up and I have a few small problems that I quickly need to resolve. 1. I have a snow covered car. The snow falls off the car to reveal a new body-paint color. The source is a pre-constructed, scattered and point-replicated point cloud on top of the car geometry, revealed based on input particles from falling snow. (I used attribute transfer with a solver node for that) Everything is working fine, except of course that all my particles are dropping from the car, simultaneously. My question is; how do I start them off "frozen" and have them fall based on my input? I was imagining an animated noise pattern so control the activation, of sorts. But maybe an animated metaball setup? I am just not sure what particle attribute to use. The "active" one doesnt seem to do anything. 2. Ideally I would like this snow to be grains, so that I can have clumping and stacking, but since I am colliding with car geometry, the grains always explode. Is there a way to maintain constraints without everything exploding? I am using a vdb collision volume sample of the car. It looks like Houdini automatically adjusts the particles so that there are no intersections with the collision VDB, but I cant seem to get away from the explosion. 3. How the hell do I get geometries with a shadow matte shader assigned, to not cast shadows on one another?! but only from objects that are NOT a shadow matte? I am basically just trying to render this snow out in two passes, and one is a shadow pass. I only want shadow from the snow, affecting my ground and the car. But no shadows from the car affecting the ground & vice versa. Much like Vray's material wrapper. 4. I have 6 licenses but have not yet set up HQ server. Could anyone briefly explain the process of getting this setup? Thanks so much for any help and input! // Mats www.swedeballs.com
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Hi, I'm trying to set the activation of pieces in an RBD fractured sim by using an attribute created from the density of a volume in SOPS. But when I run the sim, pieces that aren't supposed to fall fall, and pieces that are supposed to don't. When I look at the initial attribute created through the volume, and the activation values in the DOP data, it appears to be correct, but it doesn't sim properly. I have no idea what to do to get this to work properly . I'd really appreciate any input anyone can give me to help fix this!
