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haggi last won the day on January 19

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  1. Fluids - help!

    Not sure why it worked for him, but if you set the velocity in the sop node vdbfrompolygons1 to point.v instead of point.P it work very much better. In the video you can see your scene with the modified v. tub.mp4
  2. junior reel advice

    Indeed that can be a problem. There are a lot of Houdini TD's with technical skills. If you want to do VFX the most important thing is that the shots should look good and that you can find good references and try to recreate it and go a step further and make look it great. Your helicopter explosion is a good example. It simply does not look like an explosion, it looks like a toy catching some sort of fire. There are a lot of references on youtube or other platforms or in movies. Have a look how an explosion looks like, what happens with the object and how incredible fast it is in the first few frames. The idea of handling a complex shot is good, but I'd concentrate on one shot, e.g. the exlosion or the crash with explosion. One good shot is worth more than a hundred not so good ones. Experiments are nice, but that's something every TD will do and can replicate. If you want to show the experiments, then make a short sequence of 10 secs and make it look nice. If I look for some VFX TD, I need someone who is able to make an fx good looking, not techically correct. It helps nothing if you are technically perfect but the shots needs a lot of iterations because it does not feel correctly. Another example can be fire. CG fire in most cases looks quite wrong because it is too slow, so if you can do it right, you will have a better chance to get a job.
  3. Render a simulation

    To change the resolution go to the camera and set the resolution there, or you override it in the mantra render node. And the colors are defined in an attribute on the geometry. To change the colors you try to find the node where it is done in the fluid source sop or do it in Houdin after rendering.
  4. Render a simulation

    In my file everything is already setup for rendering. Sorry if I did not make it clear. In your scene you can set the display flag to the GUIDE null. And then you can render the geometry, or you simply open my file and render it.
  5. Render a simulation

    Click on the fluidsource node with the right mousebutton and then a popupmenu should appear which looks like the one in the image. There is a menupoint "Allow editing of Contents" at least in my Houdini. BTW. did you have a look at the attached hipfile?
  6. Render a simulation

    I think in this case the easiest way is to click on the fluidsource sop with the right mouse button and select "Allow editing of contents". Then dive into the network and set the display/render flag to the "GUIDE" null sop. fluid_.hipnc
  7. Render a simulation

    Very first result if I search for "render velocity trail houdini" on google: https://entagma.com/colored-trails-point-advection-rendering/
  8. Render a simulation

    What you see in the lower image is only a visualisation of the velocity field, not the final geometry. A fluidsource node is usually used to create volumes for fluid sims. If you want to render the trails, you can scatter points in the volume and use a volumetrail sop to create trails which can be rendered.
  9. Render a simulation

    If I undertand it correctly you want to render the velocity visualisation in the lower image, not the volume is that correct?
  10. Thanks, indeed using only the houdini.env file seems to work. But I hoped to solve it with json package files. The main problem seems to be that the Renderman paths somehow modify the Arnold paths and adding "prepend" or "append" methods to the path variables seems not to work. Well it seems that Houdini is reading the package files in an alphabetical order and so I renamed Arnold.json to ZArnold.json and now it seems to work .
  11. Hi, I try to install Renderman and Arnold at the same time in my Houdini Indie 18.5.351 using package json files. Unfortunately I cannot use both together. I attached the json files if anyone want to have a look. If I only use Renderman, it works fine, if I only use Arnold it works fine, as soon as I try to use both, I get errors like this if I create a new geometry: And the render rop node is missing a lot of necessary settings. Maybe anyone has some experience with this and can give me a hint what I can do? Arnold.json Renderman.json
  12. My resample follows exactly the nurbs curve with default settings. How did you manage to get the difference?
  13. FLIP FLUID Mesh penetrates surface

    As much as I know, this problem cannot be solved by simulation setting. Your surface field is not the accurate representation of the final flip surface. So what I usually do is meshing the fluid and then substract the collision surface from the liquid surface. There is even an option for this in the particleSurface SOP.
  14. Cross Product not returning perpendicular axis

    Instead of using @tan, you should use v@tan. Houdini only recognizes default attributes correctly. So if you use @tan, it is interpreted as one single float for all three axis. Ah.... juse a few minutes too late
  15. Motion vector not working

    I suppose that's because the optransform() returns identity matrices only in your case. What about using a trail sop to calculate the velocity automatically? Or use a timeshift to calculate the previous point position.