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Found 11 results

  1. Hi, I have rbd object emit from DOP particle, and I scale each rbd over time by @age. But I want them to stop scale at a certain amount because I feel like they are big enough. How do I make them stop at the red marker size? Thanks in advance, Candy_FireWork.hip
  2. Hello everyone! I'm programmer starting in Houdini 17.5 and it's very confusing to me. I'm familiar with hadoop/spark, which is kind of similar to TOP. But boy, is TOP confusing to me! What I want to achieve: I a have geometry node dependent on time (for each frame, it loads Alembic from file sequence, processes it and stores again alembic). I'd like to parallelize this (the frames are independent). Local scheduler is fine (I have many cores on single machine and a lot of memory to spare). My tactics for achieving that: Create a TOP network: Wedge over frames to create work item for each frame Run geometry import with Frame = work item frame Run ROP Alembic Output for each work item The problem starts in step 1, where I do not know how to generate work items with different frames. In other words, I want to wedge across frames but cannot. I've tried to change the attribute to "pdg_frame", but the frame was still 0: Additional questions on TOPs: How do I debug which attributes are on work items? If I wedge across "MyAttribute", I cannot see it anywhere (info, task graph table), but if I export it as CSV Output, I can see it exists. Thank you all for your time!
  3. Hi guys, I have a rigid body sim with constraint network, I want to access the previous frame and current frame data of the constraints (impact, forces etc) inside a sop solver in DOPs. Currently when I call the attribute in a wrangle from the relationship geometry node I don't know if it's current frame data or previous frame. How to get both the current and previous frame data in a wrangle in sop solver in dops?
  4. Hi, I'm pretty sure this is a simple question but i can't seem to solve it. I want some particles to emit between a certain number of frames and again start and stop in different frame number. ie for eg :- Starts from 1 and stops at 10th frame then again start from may be 15 to 20 What would be the expression for this, i'm using "$F >1 && $F<10", it works, but then i don't know how to get them to start again from 15 and stops at 20th frame. in the same . This is for Impulse Activation (in POPnet) Any help would be really great. Thanks
  5. New Houdini Noob here again, question about changing framerate for Alembic output to C4D. Was successfully able to render to disk an .abc sequence, which according to the C4D Alembic dialog box imports at 24fps. There's an option to change this frame rate in the C4D import, but going frame by frame shows it just repeats frames in the typical pulldown pattern for 60fps, for example. Is there a way to change the framerate output of the fluid sim in Houdini? Either that or perhaps a Time scale property in the fluid sim node that lets the simulation run at half speed without changing its physics?
  6. Hi all! Posting this challenge here means i've spent a lot of time searching for a solution at this problem, no succed. It's quite simple: You have a set of points, a randomly event occurs for each one of them and once that happens I want to set the frame of the incident into a point attribute. I think is simple but i've been stucked for a few days, hope you guys can find a solution and bright me one more time. Thanks! I attach an example (failed) file. setFrameIntoAtribute.hipnc
  7. Hey guys, I'm doing a pyro sim and had to interrupt the simulation before finishing due to needing the computer for other work. Now I wanted to continue the simulation from a certain frame but I've run into trouble. I duplicated on of my .sc files and made it a .sim (maybe this doesn't work?) And tried to continue but it restarts the pyro (from that frame) and just resumes with the current source being fed into it. What is it that I need to do here? Thanks in advance! Cheers, Jack
  8. Hello! I'm kind of new to Houdini and when I save a frame in mantra ( file > save fram as... ) it doesn't keep the real color which are displayed in my mantra render. I tried TIFF, TGA, JPEG 100% and nothing worked, colors are still different from the one coming out of my mantra render.. Any idea how to keep the exact same color ? Need help, have a nice day guys! Fay
  9. Hi there! I've been scripting in Maya for some years now and I decided to give Houdini a try but I still have some issues understanding how cooking works. I'm trying to implement my own cellular automata (a classical 3D Game of Life). The algorythm is pretty simple: my class first generates a virtual 3D grid which is made of livings cells (1) and dead cells (0). Then, at each iteration of a custom user input parameter, it analyses the current grid and does some work to modify it. But I have a hard time figuring how to do this. How can I have my script memorize its current state at each frame? For now the node just cooks entirely at each iteration, which is obviously pointless. Is there a way to execute only one method of my class? I thought about using a callback on the iteration parameter but I can't understand how it works in Houdini (I just made a "New Operator Type" and wrote my script inside the "Code" tab). Sorry if this sounds stupid, I'm still learning! And I couldn't find anything useful on Google.. Thanks in advance for your help!
  10. Hey guys I have a curiosity about render, its possible to render just a small rectangle area for a frame which contains the object that is moving and make that way to render all frames? like a per frame crop, to optimize the black render processing for mantra Thanks
  11. Hi, I've seen a few topics on this subject, but none actually solved the issue in the end. So here's the problem: I'm writing out a flip mesh (vdb) to disk (using the rop output driver), and the first 1-2 frames go just fine (takes +- 3 min per frame). Of course Houdini uses a lot of RAM for this, but the problem is that it doesnt flush it after its finished writing out a frame. The cache stays, and houdini doesnt free up the memory, causing the whole computer to slow down (it then takes like 3 hours to write out 1 frame!). Is there a way to clear the node cache/memory after cooking a frame?flushing the cache from the cache manager isn't really possible (since I'd need to stop the writing after every frame). After i stop the writing, the memory only frees up again after I actually close houdini. p.s. I have an AMD FX8320, with 12GB RAM and a weta digital 3TB green HDD. Using houdini 13, on windows 7.
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