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Found 199 results

  1. this has to be simpler than i'm making it. I hear theres an active attribute i can set but dont know how to do it. Currently i'm trying to faff on with an attribute vop and some xyzdist and compare and if-then block but i cant get it working. I got the trick from a search results and a file but houdini doesn't seem to have the if-then block i need so its really confusing me. can anyone help i just need a nice solution for pinning some parts of fractured wall to the floor maybe based on a proximity value or a group or something so i dont have to manually enter all the pieces as active=0 i cant supply a scene sadly as i'm in work and cant upload anything. But its a pretty simple ball hits wall scene really :/ really confused by this ant
  2. Hi Guy, I am working on a project, it is a fractured wooden logo that I need to explode the pieces and then get them back together which turns to another logo. So, the second logo has to be created from the pieces of first logo. What would be the best way to do such a effect?
  3. Hey everyone. Hope you guys are well. I need some help with a shot I am working on. Basic idea is i need to have bits of strawberry to fall into swirling yoghurt,hit the surface,swirl around and slowly get pulled under the surface. I've got the swirling yoghurt working but when I drop my RBDs into the container they plow right through the flip sim. I've tried tinkering with the Feedback scale,Density and so on but nothing works for me. If anyone of you Wizards can have a look and shed some light on what I am doing wrong it would be greatly appreciated I have a scene attached Swirl_03.hip and my swirl force source geo FOR_OD.rar Thanks again Cheers Dimitri Swirl_03.hip
  4. Hi!The question is the following. I have a simulation of the destruction, can I create a "height threshold" not according to the position of any of the coordinates, but for example using a color or something like that. File as an attachment Dest_0.1.hip
  5. I'm gradually trying to learn various of Houdini's solvers (primarily cloth, pyro, and bullet for now) and I'm slowly getting to grips with how they work individually. What I'm struggling to understand, and also struggling to find good learning resources for, are the ways to create interaction between multiple solvers. I'm interested in setups for one-way interaction (eg. pyro affected by bullet/rbd sims) but even more keen to understand two-way (or more) interactions. For example, how to have cloth and bullet (and perhaps pyro as well) all working mutually in a dynamic simulation, all affecting each other. Can someone point me in the right direction towards learning how to combine different solvers together? Are there generic ways for doing this (in other words combining cloth and bullet would involve the same understanding/setup as combining pyro and cloth), or does every solver/combination have its own idiosyncrasies when trying to combine? I found this video about combining pop and bullet solvers: https://www.sidefx.com/tutorials/combining-solvers-with-a-multi-solver/ I assume a good understanding of the multisolver is key here. But the multisolver doesn't accept the cloth solver as an input, so it seems like there must be more to it than that... Any help much appreciated!
  6. i have managed to create a network of masked gravity force to drive the RBD packed objects but I'm a little confused about how to proceed further. i need to control the moving pieces of geometry more effectively with further forces as well as create debris from the cracks or where it fractures. any direct help (i have attached an example file) or pointing me towards resources where i can learn further would be cordially appreciated. thank you and best regards fracture.avi fracturingGeoMaskingForce.hipnc
  7. Hey everyone, I'm trying to blow an object through a wall. I need a lot of control over the art direction. I have been doing my look dev in C4D where I can paint active vs passive objects. I can also have the active objects asleep until there is a collision detected. I have attached my working Houdini file. I haven't been able to figure out to paint active vs passive objects, so my workaround has been to alter the glue strength based on a color attribute that I created in the constraint network. This seems to work okay, but the wall get's knocked over when the collider goes through it. How can I pin this wall down to the ground? The tuts I've found all seem outdated for H16. Any help is most appreciated. Thanks! -Brian
  8. Would anyone know how to pre-fracture geometry in houdini, bring it into unreal engine and have it be dynamic (responsive to real-time collisions)? I know unreal has a way to do it and be dynamic, but Im wanting to be able to art direct from houdini for the area where my collision will happen in the level. I have already tried pre-fracturing with voronoi and exporting as alembic and fbx but no dice. Just wanted to see if anyone had a solution to this. Any ideas?
  9. Hey guys, working on a destruction peice and wanting to take the velocity from my charachter and put it into my bullet sim - So decided to try and use a sop geometry node to bring in the calculated velocity (from a trail and fluid source) - which is working perfect. But my sop force doesnt update each frame, its static - ive tried changing the expression from $T to $F and other things, not sure if its a limitation or if im doing something wrong? i will attatch a file but will be missing the geo but atleast you guys can see the setup Any help would be great! Thanks Destruction_v3_t2.hip
  10. hey, i am piping the results of an rbd sim into a debrissource to generate particles and then smoke. this method has worked for me so far. this time, however, the points are not being scattered on the actual cracks. i am not sure if i got my name attribute screwed up when working with the fractured pieces as packed geo. looking into the debrissource sop tells me that the name attribute is required. any ideas? thank you!
  11. Hi again, I got a simple piece of geo here which I'm trieing to convert to an animation. I tried a wire sim with a wire capture, some constraints, a rbd collision method but This chain isn't willing to behave like a chain. More so if the chain is meant to follow an animated object while swi9nging around. Could anyone show me an example on how to make this thing work? Chain chain.bgeo
  12. I am having a couple issues. One i am unable to get mantra to render a single frame. It tells me i have to delete all of my nodes to render. my second issue is that my shattering glass that i cached out is not showing up when i source it into the file node. Also when i link all 6 furniture files, the debris, bricks and pyro explosions that are pre-cached, Houdini crashes. Please have a look at the scene files and advise. RBD_Destruction_Help_File.hipnc Shattering_Glass_cash_File_Help.hipnc
  13. Hey people, I heard this forum has a lot of really talented and technical oriented people who can help me out of my problem. At work I have to do some research and create a little scene where a car SLOWLY falls down a cliff. Imagine someone would push a car down a hill without a driver and it falls down to hell. So as a Houdini-Newbie I imported an OBJ of a car and declared it as an RBD-Object. My simple-geometry-plane is a static object. Through the gravity tag my car "rolls" down that hill and jumps over the cliff. But there is one problem. The center of mass should be more in the front of the car. Is there any easy way to move the CoM-point to the position where the engine sits? I tried different things like pushing the pivot aso. but nothing worked. It seems like Houdini tries to calculate the center of mass in the Object-Level with a bounding box and ignoring my custom moved pivot. Is there an easy way to define an exact point, where my center of mass is? Or is there any way to show it at least? My goal is, like you will see in the screenshot, that my car falls down a little bit faster in the front. Like it would behave in real world. Now it is pushing itself over the cliff until it gets over the center point of the OBJ. Thanks, Bastian
  14. am having two issues. One i am unable to get mantra to render a single frame. It tells me i have to delete all of my nodes to render. my second issue is that my shattering glass that i cached out is not showing up when i source it into the file node. Please have a look at the scene files and advise. Shattering_Glass_cash_File_Help.hipnc RBD_Destruction_Help_File.hipnc
  15. I have three individual components to this briefcase, the body, the handle rings and the handle, the body is a static objects and the other two are RBD packed objects, all concave. I am trying to get the handle to hang from the suitcase naturally but they are falling through each other, there is a slight reaction but i cant get them to completely react to each other. I have attached a zip of the three .obj files and the .hip file if anybody could have a look. Any help would be really appreciated ! Thanks! Assets.zip
  16. I am having two issues. One i am unable to get mantra to render a single frame. It tells me i have to delete all of my nodes to render. my second issue is that my shattering glass that i cached out is not showing up when i source it into the file node. Please have a look at the scene files and advise. Shattering_Glass_cash_File_Help.hipnc RBD_Destruction_Help_File.hipnc
  17. I have a load of RBD packed objects smashing on a Ground Plane, they're all intersecting by a consistent distance through the Ground Plane, the RBD packed objects are all convex hull rather than concave although changing between the two doesn't seem to make a difference. I've tried replacing the Ground Plane with a static box and trying different geo representations on it but that doesn't seem to work either. Any suggestions on how to fix this would be really appreciated! Thanks
  18. Hey everyone, I'm trying to blow an object through a wall. I need a lot of control over the art direction. I have been doing my look dev in C4D where I can paint active vs passive objects. I can also have the active objects asleep until there is a collision detected. I have attached my working Houdini file. I haven't been able to figure out to paint active vs passive objects, so my workaround has been to alter the glue strength based on a color attribute that I created in the constraint network. This seems to work okay, but the wall get's knocked over when the collider goes through it. How can I pin this wall down to the ground? The tuts I've found all seem outdated for H16. Any help is most appreciated. Thanks! -Brian WallExplo_Help.hiplc
  19. Hello OF, I have a small issue which I hope you can help with... I am creating attributes at SOP level to control the breaking of constraints in a SOP Solver in DOP's using the following VEX code in an attribute wrangle connected to 'relationship geometry' of the SOP solver. if (s@constraint_name == "pin_between"){ if ((f@torque>@break_torque||@angle>@break_angle||f@force>@break_force)){ s@constraint_name = "pin_broken"; i@breakframe = @Frame; } } My issue is that when I disable one of these attributes at the SOP level, the sop solver seems to interpret it at a value of 0, and the objects constraint will be completely removed on collision. Is there a better function to use than 'or' in this situation? An 'if else' seems more appropriate, but I am unsure of the syntax of that in this situation within VEX. Any help would be greatly appreciated. Many thanks in advance.
  20. Sorry if this question has been asked before (I've been searching the forums and still can't find an answer) but I have a question about setting up constraints for RBD Packed Objects. In a nutshell, what I'm looking to do is allow my main piece of geometry to "stay in place" while gravity only affects the pieces that are being collided with. I should mention I'm still relatively new to Houdini so I don't really have any idea of how this process has changed over serval versions—I'm on 15—nor do I have an extensive knowlegde of Houdini at this point (unfortunately, but that's why I'm learning). So far the issue I seem to be having is that my gravity is pulling down all of my fractured pieces (which are being held together by a glue constraint) but this geometry is part of a larger building which means I have to make sure it looks as if it is attached to the larger structure. Example image below. Hopefully this all makes sense and is enough to go on because I brought in all of my assets from Maya (alembic). I feel like I'm just missing something really simple here... tried adding a Pin Constraint earlier but realized there is a difference between using constraints with RBD Packed Objects and a regular RBD Object node... now I'm at a loss. Thanks in advance for any advice! -B
  21. I have two separate stacks of geo made using copySOP's, i am trying to get them to interact with each other. They do interact with each other but the constrains only effect one model, i can switch them in the merge but its only ever one that holds together, the other falls apart instantly no matter what the glue strength is. Ive put photos below and attached the scene file with the model that needs referencing in. New to Houdini so any help or advise would be greatly appreciated! Thanks PlateSimulationTest001.hipnc plate.obj
  22. Hello! Do some of you sometimes use Fluid Force node? I want to have my fluid having influence on meshes, and I cannot manage to set the node properly. If you use another method for this, I would be happy to learn it. Thank you! leafNdrop.hip
  23. I Have stacks of plates and bowls that i made with a copy node on one original model of each type of plate or bowl rather than importing each model multiple times. I want each object to be able to fall and smash independently which i am struggling to work out. When i make the stack a RBD Glued Object it either all moves and smashes the exact same way like they are being read as one whole piece rather than individual plates/bowls or they move individually but the glue errors saying "making objects from different solvers mutual affectors" so they cant smash. Sorry if this is a basic question i am new to Houdini, any help would be greatly appreciated!
  24. Hi guys, so I'm doing a scene where berries falling into a bowl but I use a sphere and a simple cup modeled to visualize then I realized when I use rbd object on the sphere and static object on the cup, the sphere doesn't drop into the cup but instead it drop just before the cup. I've been trying to figure out but I have no idea why it turns out like that. Any clue what happened? testyog.avi
  25. Hi guys, I'm started on a H16 sim where I have a cup of ice and fluid and another piece of ice that will dive in and float back up (animated). I've almost always dealt with larger water sims and don't have much Houdini experience with small scale sims I figured some people here have experience with such simulations and would like to ask if there are any best practices and tips here? I have some questions myself 1. How important is it to try to simulate and keep everything to scale for rbd and flip sims of this sort? I have found in my initial bullet tests that just trying to fill the glass with ice at scale tends to give me exploding rbd sims. In this case, I had the ice cubes and glass modeled in maya. When I brought it into Houdini I scaled it down by 100x to match the meter scale in Houdini. I tried adjusting the collision padding to stabilize the sim but to no avail. I had no issues when I worked at 100x scale. I'm curious if anyone else has experienced this? However, not working to scale meant that my flip sims feel larger in scale, like a swimming pool and not a cup. Increasing gravity 3x has helped the sim look more to scale. But that seems very arbitrary to me. I'm more inclined to work at a bigger scale as adjusting to smaller scales have given me all kinds of problems from unstable rbd sims to leaking water particles and decreasing water levels. 2. Is flip the the recommended approach for these fluid sims? I've seen sph being recommended. But honestly, I don't even know where the sph tools are 'hidden' these days in Houdini. And I know these days SideFX recommends flip for everything. 3. What is the best way to get some of the ice to interact with the water sim? Via density and flip solver feedback or the bouyancy force dop node? 4. Any tips on dealing with collisions and keeping things water tight in a thin lip glass that still needs water to splash out of the glass? When testing, I often found that it was very easy to leak fluid from the container even though my flip collision guide shows that there isn't any holes in glass collision. 5. Any tips in meshing the fluid with regards to lighting and rendering? I've seen it recommended that the water geometry be slightly larger then the glass. How are folks doing that with flip sims? I'll try posting an example file whenever I get to a good point. I really would like to benefit from the experience of folks who have done this sort of sim. Thanks in advance.