christianl013

sorry, I only had my file from work and I am not able to share it, but I was able to figure this out in the meantime and got something working. I will try and post a file in the future or make one that I can upload. Cheers.

Is there a way, with the bullet solver, to detect when a collision happens? I want to be able to do hit detection but I have not been able to find any attributes on the bullet solver that inform me as to how many hits or any data like that so that I can setup other things to happen when certain objects collide etc. Thanks! Best Christian

Hello, I have a scene where I need boulders to fall and hit the ground with as much impact as possible. I have only been able to get this to look like popcorn where the objects bounce off each other and the ground and it does not seem to matter what density settings or friction I use when I increase these it just starts sticking or going into a slow mo effect etc. Could anyone give me some ideas on how I can achieve this? I am using Bullet solver currently. Thanks. Best, Christian

Thanks guys, I looked at those links, very helpful. Thank you.

Thanks, that's a good idea, what about a detail wrangle? Can I use a detail wrangle for something like this as well?

Hey guys, prob a noob question but I haven't figured it out yet. I want one set of points to become active when they get within the proximity of another set of points. But I don't want the active points to become 'inactive' again once they go outside the active radius. In other words, once they are active they are active forevermore. I am using pcopen and that's the result I am getting right now. How would I achieve this? Thanks. Best, Christian

Ouch. Okay, I guess that could explain it. Thanks. Cheers, Christian

Hi guys, I just upgraded to houdini 18 and for some reason the render to backround button is not working. it keeps telling me that I need to save the file first, but I have saved the file every time and hit the button immediately afterwards but it still gives the same message. However, if I close and reopen the file for the first time it works if all I do is push the button as soon as the program opens. I am using Houdini 18.0.391 on windows 7. Anybody else have this problem or know how to fix it? Thanks. Cheers, Christian

Thanks, that solved it for me. since I was re-sampling the prims I had to put the attrib transfer before the resample, otherwise the point ids were all scrambled. Anyways, thanks for the direction on that. Best, Christian

Hello, I have a setup similar to a plexus effect where I have a point cloud that has lines connected to the points by proximity. The issue here is that after a time the connected points need to animate to a different position and the lines they are connected to start to pop off and on due to the change in the proximity of the points. Is there a way I can lock this down after they are created so that the lines always stay anchored to the points without losing their connection? I only have a production file right now so I can submit a hip right away, but if anyone has any ideas that would help alot. Thanks. Best, Christian

Thanks, I was using vray proxies and I found that I had to promote the UVs to points. that seemed to solve it for that specific case. Best, Christian

Hi Guys, I am making a shot where I have a vellum source emitting thousands of cloth patches into a tube. The source geo has UVs and seems to be textured properly in Houdini, However I have to export this system to another DCC for rendering at my studio. When I did the export (abc) and apply a material to the export the material does not go on like it did in Houdini. I ensured that the UVs were exported when I did the export but it would seem that this does not work the same. Does anyone have any experience with this? Do I need to do something else to get the UVs to transfer properly? Any help on this would be awesome. Thanks. Best, Christian

Yeah, in summary, you have to calculate v by importing the tangent normal of the curve and pcopen allows you to import the normals from the curve so that you can use it for velocity and in turn apply that to your POPs. You can also just try using the pops curve force node, it works with multiple splines as well. I hope that's helpful, the files linked in this thread were helpful for me as well and hopefully could be of some use to you too. Cheers, Christian

Hi Guys, I noticed that TOPS does not seem to recognize the $JOB variable. Is there a workaround for this? Do I have to create an attrib that can be read by TOPs specifically. I am a TOPs noob for sure so I just wanted to ask and see if anyone else has run into this. Thanks! Cheers, Christian

Hi Guys, I have a ball of yarn I made with curves. I need a poly sphere to push through this ball of yarn from the inside moving out and have the ball of yarn return back to it original state (form). I tried the ray sop but the points snap back into place and do not move smoothly across the surface of the sphere. I have only been using Houdini for a year now so I am still a bit of a noob and I am not sure if there is a way to solve this with sops as opposed to wire solvers. I am not that familiar with wire solvers as of yet and I am not afraid to dive in but I am on a bit of a deadline so I am trying to get a jump start here on which direction I should go on this that will get me there the fastest. I have looked at alot of things on the net but I have not been able to find any solutions on how to achieve this effect. Does anyone out there have any ideas on how I should go about doing this? Thanks alot. Cheers, Christian