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Heraklit

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Everything posted by Heraklit

  1. FLIP collision madness

    Hey, I do have a little problem with flip collisions. I'm simulating a layer of caramel on top of which I want to add a layer of chocolate. The mesh of the first layer I converted to a deforming object. Collision volume and everything looks just fine. Unfortunately flip is going crazy when it touches this surface.
  2. Hey, Got a little question regarding the advecten of large scale volumes like clouds. They won't have much of a directional movement but this typical billowing. I build a setup that takes the surface field and places some cross product swirls right under the surface, adjust the noise frequency depending on the depth and also the amp etc... but it's still not convincing me. Do you have an idea how to realize this in an efficient way? Cheers!
  3. Slowing down fluid dynamically

    Okay, works exactly like I thought. Got it!
  4. Slowing down fluid dynamically

    Hey guys, I have a Little question: what would be the easiest way to retime a fluid dynamically? So there is a timewarp node but I want a fluid to slow down on a certain Frame and then move on in the normal Speed. So probably Need a timrshift too and Switch to the correct retimed Version. Sry, could figure it out by myself but there's quite some stress atm with other parts of the Project : /
  5. Cofe with foam/bubbles on top

    Hey, I have to to some fluid stuff for a cofe. It needs to have some cream/foam/bubbles on top. It shall run in from the top of the glas and generate that stuff on top. Pretty tough deadline. Any ideas on how to approach this in an efficiant way? Maybe using the surface field and change the chading on top depending on the distance? Any tipps are appreciated
  6. Partial collision detection

    hey, little problem here. I have a piece of cloth made out of grains. Its colliding with an object. Here I use a collision detection in combination with a collision behaviour. The collision detection shall only detect a few polygons of the whole object to stop the motion there. Referencint the polys in dops. Its giving me a correct collision guide but during the sim it keeps ignoring it. Insteat it freezes the grains along the whole 'main collision object'. So that are the areas to collide with, just a few squares.
  7. Look inside the exampple files for "spinning flip collision" or so. Its causing an emission in dependency of the velocity
  8. Grains morph target geometry

    Hey, how would you go about transporming the target geo in something different without having the grain solver go crazy? So not just a transform, shuld be a different kind of geo. Also with intact constraints.
  9. Hey, I got a really stupid question but I can't get it to work ATM. I want to put an expression in e.g. a fluid source node in dops. Something like "if($FF)<225, 1, 0)". So when smaller than frame 225 take 1, else 0 (or another expression like a sin curve). What am I missing here?
  10. Activation expression

    Nope, unfortunately still not working if(($FF<225, 1, 0)) if($FF)<225, 1, 0 if $FF<225, 1, 0 if$FF<225, 1, 0 None of them, its only returning 0
  11. Ugly artefacts

    Hey, got a pretty annoying problem. A certain area of my ocean always gets some artefacts. The dark area isn't responding to AA blur, geometry input etc. Rght behind that its okay again. ANY idea whats the problem here?
  12. Ugly artefacts

    omg, I had to adjust the raytracing bias on the rop
  13. Hey there, how would you go about changing the animation/simulation state of e.g. a cloth sim? I tried the pin to animation attribute to release the cloth object from the animation; but bringing it back to follow the animation is harder. it just snaps into place when I put the attribute back to 1 in the sop solver (dops). Also does anyone know a way to mix between animations and simulations? Lets say the cloth object is meant to somehow follow the movement of a master object but also should react to some forces. Or in other words: object is moving fast = animation state; object suddenly moves very slow = simulation state; objects moves out of the frame again = smoothly go back to follow an animation. The pin to animation attribute isn't allowing 0.5 values or so.
  14. Hi, I guess thats a pretty easy question but I couldn't figure it out yet. So I have an obj import that consists out of a big amount of pieces. Importing it to other apps brings in the materials too. So I just can work on those materials insteat of reselecting everything. Importing that obj to Houdini doesn't show any materials. Why is that?
  15. OBJ Import Material Links

    OK, got it
  16. OBJ Import Material Links

    Anyway, I can do it like this. But another problem: I can't merge all resulting material node together for rendering. This is causing shading errors. I can display one material at a time and render the whole thing with proper material assignment on one set of primitives. As soon as I try to merge two material nodes together…shading issues. I need to blast the primitives depending on their group. So how can I blast them based on this selection expression? @shop_materialpath=="/shop/Cruiseship_cleanup_v003_rpr:Glas_Grey_DisplaySG"
  17. OBJ Import Material Links

    ATM I have to use the "@shop_materialpath==..." eypression which is handier than selecting every object but I still have to write out lots of material names and then create them manually. No idea of python
  18. OBJ Import Material Links

    I didn't ask for an OBJ but the fbx seems to be corrupted. Well, I'll see.
  19. OBJ Import Material Links

    That doesn't sound very comfotable when you have to deal with hundrets of materials
  20. RBD active value

    Hey, I'm trying to implement an old trick I used several times with older versions of houdini. Just trying to transfer a color attribute to some points placed in the center of the fractures pieces to use it as an active value in the dop network. Unfortunately nothings happenning. Some idea what could be wrong here?
  21. UV loop

    Hey, I need a bump map to repeat on each primitive of an object. Not I can use an uv flatten in a for each loop and apply a map onto each prim. That works with simpler scenes. But on my scene the loop has to make 600.000 passes + it tends to crash. Does anyone know a way to increase the speed of this process or a better, faster way? Cheers!
  22. Hi I have to work on and animated piece of cloth where the individual square pieces are docking into the animation. How would you go about the rendering? I got an attribute that separates bright pieces from the dark ones. Can call that attribute into the shader but need more variation. Would you use a for each loop to iterate over each piece in order to apply e.g. individual uvs for each piece? The material should be very sparkly on some parts.
  23. Carbon fiber cloth with single peaces

    Thin I got a soltion
  24. Collision Volume

    Hi there, I've got some strange problems with the collision volumes in flip. The static object itself shows a clean, closed volume; the flip object on the other hand shows me a mess. Nothing is closed, the collision volume seems to be made of stripes. How does this discrepancy between static object and flip object happen regarding collisions? Actually the flip particles are floating inside the object. Got a new ship model and obviously some diffuculties making it work I also tried to use for each loops to convert each single object the shi is made of into volumes in order to merge them together insteat of turning the whole thing into a volume at once.
  25. Collision Volume

    After some time worked on that thing again. Could need some lanterns for warm light
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