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Everything posted by Atom

  1. Redshift IOR Glass issue

    I see darkness at the border. Maybe you need to increase max bounces..?
  2. So you exported 200,000 .rs files to the disk? That would be the workflow for proxies, right?
  3. [GIF INCLUDED]How do I achieve this effects?

    Try searching this site, or click on the link in my signature. A lot of these effects have already been explored.
  4. Animatng Hair growth / length?

    You should be able to animate the length using a GuideProcess node with the operation set to SetLength.
  5. Randomization of hair length

    Use a GuideProcess node with the operation mode SetLength. Activate the Randomize check box. What is nice a bout this node is that it works on any lines in Houdini, not just hair.
  6. That's interesting. I was poking around inside of pdb_constraint.h today to try and find out why OpenCL has all of a sudden quit working on the GPU. I got a message that about variables not being defined as double precision. I wonder if some type of compile switch has been janked on these recent Houdini builds? (using H18.5.532)
  7. OpenCL Exception in Vellum

    Under Edit/Preferences/Miscellaneous, try switching from GPU to CPU for OpenCL. I have the same problem, even older vellum projects no longer work. My guess is video driver updates have altered the way Houdini perceives my GPU hardware.
  8. Try promoting the Cd attribute from point or primitive to vertex and export again. Also kick out an alembic from Cinema4D and import it into Houdini. Try sending attributes the other way to see what is expected..?
  9. Animate Bullet substeps

    As mentioned in the master class, changing the bullet substeps from 10 to a larger number does not necessarily produces better results. Your "things" should not fall through the ground even at the default settings. Review your collision meshes first.
  10. Also, if you are just instancing spheres, try leveraging Redshifts render as particles instead. No geometry needed. I don't think Redshift uses a special attribute. I always used @instance and that seemed to work. If you do have a .rs file (which is recommended) then use @instancefile to target it on the disk, but don't specify both attributes. Here some code from one of my instancers. string subnet = chs("../subnet_source"); // Numbered variants inside subnet. int max = chi("../item_max"); // Variant count. float rnd_seed = ch("../rnd_seed"); // Select random item int item_num = int(fit01(rand(@ptnum+rnd_seed),1,max)); s@instance =sprintf("%s%02d",subnet,item_num); // Apply random rotations float randRot_Y = fit01(rand(@ptnum + rnd_seed+3),0,360); @orient = quaternion(maketransform(@N,@up)); vector4 rotate_Y = quaternion(radians(randRot_Y),{0,1,0}); @orient = qmultiply(@orient, rotate_Y); // Apply random size f@pscale = fit01(rand(@ptnum+rnd_seed+10),0.75,3.0)*ch("../size_mult");
  11. Does Houdini support geforce GTX 16 series GPU

    I'm not aware of any drawback for increasing the TDR delay, so you might as well give it a try. What do the logs say? Are you sure it is your graphics card? One simple test is to leave the Materials icon for the 3D viewport OFF (save as viewport default D-KEY). This will prevent additional features from being applied, features your card might not have. Maybe force a chkdsk on the drive where you have installed Houdini?
  12. How to render pyro in RedShift?

    You'd think a light would be unified by now, but it's not. So you have two brightness controls on the same Redshift light. Contribution scale is like intensity for polygons, only contribution scale is used to illuminate volumes.
  13. Reduce collision velocity

    On the FLIPSolver, under Volume Motion, sub tab Collision, try reducing the Velocity scale down to 0.1. Also lower the magnitude of any supplied velocity.
  14. Here is a basic chops driven sample hold. For redshift light instances, you can control the brightness by supplying an additional attribute along with the s@instance. //s@instance = "/ob/rslight_spot_SOURCE"; v@light_color = set (rand(@ptnum),rand(@ptnum+801),rand(@ptnum-311)); ap_chop_hold_lag_drives_light.hiplc ap_rs_colored_instance_light_circle.hiplc
  15. I think you can extend it like this... ($F>30) && ($F<40)
  16. Unreal to Houdini Camera axis Fix

    Here is the resulting HIP using the import settings I posted with Houdini 18.5.408. FBX standard importing directly into the /obj network, not a subnet. The only change I made after import was to the Icon Scale of the camera. ap_camera_import_problem.hiplc
  17. Unreal to Houdini Camera axis Fix

    These import settings seem to work for me.
  18. Wire nodes with keyboard

    Select a node and right-click on the bottom or top connector. Choose a node from the list and press enter. This will "auto-wire" the new node to the selected input. Another auto-wire feature to select a node, choose a new one from the list using SHIFT-ENTER. This will auto connect the new node. You could create a hot-key mapping to a custom shelf tool that will "auto-wire" a selection. The hard part is knowing which nodes to connect first? Is selection set order determined by mouse box lasso? (top to bottom or bottom to top?)
  19. I have a working viscosity simulation. When I replace the tube with a hollow cube, all fluid motion stops on contact with the collision surface? I have set friction to zero, but that does not seem to be the issue. The collision object looks valid. Does anyone know how to make FLIP work in this case? I expected the fluid to continue to ooze out and around the collision object. How are we supposed to make our Cadbury egg simulation? ap_flip_viscosity_by_attribute_inside.hiplc
  20. Thanks for the replies, everyone. I also received help on Discord which provided the simplest solution. Calculate the collision object using Ray Intersect instead of providing a Volume Sample. For some reason this just fixes it..?
  21. FLIP Moves RBD Packed Objects?

    You know what, it does. In this animation the same velocity volume is supplied to both the flipsolver and the rbdsolver. Everything moves in the same direction, but it's not really flip moving rbd. Flip does seem to collide with the rbd, however. I would like to add viscosity to the animation, but whenever I enable it, the entire flip system locks up..? Does anyone have a fix for that? ap_synchronized_vel_rbd_flip_032921.hiplc
  22. I'm trying to move packed objects using flip particles. Is this possible using H18.408? It works with individual RBD Hero objects, but not packed RBDs. Is there a way to accomplish this? ap_flip_moves_RBD_pieces_032921.hiplc
  23. old popstream tutorial PQ

    @FollyxTry activating preserve group on the popgroup center. This will allow particles that leave the group area to remain in the group. Here is an addition to Ultraman's post. I connected a couple more streams. ap_pop_streams_PQ1.hiplc
  24. Vellum hitv hitpos Issue

    Are you expecting two disconnected solvers to collide with one another?
  25. Houdini crowd attract

    The way I handle this is to create a companion @P for each agent called @goal_P. Use a scatter node to scatter the same number of points as your agent count near your final agent goal location. Reference those points inside your CrowdSource setup and assign their position as the goal position. Then you can use a PopSteerSeek node in vex mode to attract each agent to each point using a single line of vex. goal = v@goal_P;