tagosaku

There is a bug in my version of speedtree. It sounds that I need to update software, and it should be fix, according to Speedtree admin!

Hi, I try to import speedtree alembic file. So far I get spines and tree wood meshes, but cannot get leaves at all in Houdini and Maya. Do I mistake exporting, or have to choose specific tree types? Or I have to modify to do something unhide in imported alembic file? Speedtree v8.3 houdini 17 maya 2017

Davpe, thanks for reply. Your method also does not work for me. I took many tests and it seem like problems are that I use packed instacing(copy node) and shaders are applied on material SOP. These combination breaks displacement switch.

hi, I am testing vellum, and have a question. When testGeo is coming up from ground, all vellum particles are influenced and pushed away. Also, when he hit ground with hummer and lift it up, particles looks being sucked into holes made by hummer. However, these particle reaction should not reach such far away distance. I'd like to know how to control the influence distance. So far, I am thinking of solutions: 1 - reduce constraint iteration, 2 - make a space between particles at emission/creation times. 3 - add more friction, increase particle separate / highres- sim, etc. This result could be ok for sand FX, but when making snow ground, this won't work. Particles should be very rigid, and particle only moves around testGeo's feet and hummer. If anyone knows how to control it properly, let me know thanks!!

Hi, I try to make a enable/disable switch for displacement, instead of cutting node's connections . So far, I tried to connect 'switch node' between collect node and displaceOutputVariables and Parameters. but it does not work. Next, I tried' Properties > add Disable displace Shader rendering'. However, it still renders displacement. Thus how should I properly create displacement switch? I am using copy instance after material is assigned with a "share displacement with instances" in properties. That's why disable button possibly won't work correctly...

uh, that's good to know there are step limitation! Then, I tried VDB advect. It's working well. but calculation gets heavier and heavier when setting time step more and/or faster vel. I wanted to try this method because I heard one of VFX companies have a VEX/VOP based fog animation, instead of using sop-solver or dopnetwork The system is not for replacement with regular fog sim, but it works for a simple Background-quality fog. And I assume that should create unique fog shape and unique motion, unlike filling out an entire box boundary volume, unlike simple linear straight offset animation.

Hi, I am trying to understand advectByVolumes node. Basically I create custom vel field and animate density by advection. When increasing timestep, density moves more, but there looks a certain distance limitation, and density does not move further anymore. I wonder what's a logic and a solution for that, instead of using sop-solver, in order to continue to proceed density animation. advectTest.hip

thank you so much for all our tips. Legal agreement and violation things are tricky. And using python with date and switch is a great idea!! In general, most houdini artists simply bring own tools to use for own shots, and other artists and production won't pay attention so much about how great a tool would be. HR says Houdini artists almost never sign up for own pre-invention uses, but sometimes pipeline artists do that.

hi, I am wondering if we can set an expire-date for HDA or blackbox? Let's say a freelancer works a project at a company for one year with bring his own HDA of a custom solver. Then that HDA will be expired and won't work any more after 1 year.

yes, that's true. Question would be how to attach leaves/fruits on tips of branches. If anyone find tutorials shows how to create/construct real tree, instead of using the speed-tree, it would be great!! Or if you can just tell me how to detect the end of wires or tips of branches, it would be very helpful, too. I think I have to use VEX like a primvertexcount in order to find points that share only one vertex, which should be tips or beginning of root.

To AtomicPerception Thanks for your reply. I took a look at your file, too. So far, important parameters to keep not-bending are: resample node > max segments 1 or 2 (more than 3 are bending a lot) GroupExpression node > @P.y<0.25 0r 0.5 (How many particles to pins also effects a lot. In other words, Pinning only a root particle is not enough) vellumconstraints(hair) > stiffness 1e+10 and dampingRatio=0.1 is pretty good. (1.0 makes bend a lot. 0.01 makes to keep moving/shaking.) VellumSolver node > set constraintIte and substeps larger numbers make less bending After that, I added subdivide node, instead of resample. Then wire gets smooth&curvy.

To Vusta Thanks for you reply. Yeah, I tried your hip file. Motion is very unstable and animation never stop. I think we need something new ideas to make a wire simulation. Otherwise I need to cheat to set gravity zero. Of course, the stretch prevention is so much better than a traditional wire sim. I was thinking vellum could replace the wire sim but maybe not...

hi, I try to use vellum in order to create TreeFX. Then I took two tests with Lsystem, and vellumsolver with wind and standard gravity: 1 - apply polywire and vellumCloth. 2 - apply just vellumHair I set bend stiffness a very large number for the both tests, but branch still bend so much, cannot make stiff well. Setting more substep helps not to bend, but not enough. Does anyone succeed to control bend parameter very well? vellum_v0002.hipnc

hi, I am looking for a way to change a node name automatically by parameter change. For instance, there is a fetch node. When connecting file cache node into source parameter, I want to change fetch's name to the file node's name. To do it, at first, I am trying to use python events. However, any events don't trigger setName code. Thus, I'd like to know how to use these python events, and know how to change node name by parameter change/update. Thanks!

hi, I am a python script beginner and have a quick qustion. I have a null node in rop which connects fetch nodes. The fetch nodes have linked fileCache pathes toward SOP. I'd like to know how to write python script, in order to change a float value in those cache nodes' UI value. I attached a captured picture and example hip file. If anyone knows how to write it, I would it. TST_000_000_fx_tsunami.v001.99.hip