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Found 61 results

  1. Scatter evenly/orderly/not randomly

    Example - made inside of ae with plugin Trapcode Form. Practically it's just particles evenly scattered on the sphere. Tried to practice that inside of Houdini using Scatter node, but it look noisy/with holes since it is randomly scattered. Seems like needed different approach. Thank you!
  2. Zahia Hadid Architechture

    Hi guys First post Ive been following a few tuts from entagma and would love any input on creating something closer to this. My Houdini experience has mainly been lighting for film but i want to branch out into more of the fun stuff. Any ideas? Damien
  3. Hi How do I save out all geometry information to a python numpy .npy file. I'm dabbling with a neural network that takes in a bunch of objs and spits out its so called interpretation..... But as yet I am working with just the points and not the vertices and prim information. How could I save all this information to an array so I could then reload the array back into houdini for houdini to display prims/vertices etc...... Thanks for your help
  4. Ripple Fade

    Hello, I have a ripple sim created with a sphere moving through a grid and the points deforming based on the velocity transferred to said grid. What I am trying to do is isolate the geometry based on where there are ripples via colour then as the rippled geo begins to settle back into what it was originally have that colour fade back to black. I'm halfway there I think. I was able to isolate the rippling parts of my grid by using a facet to compute its normals and then a point SOP to add colour based on the normal in it's Y (@N.y < 1). I was thinking of trying to use a vop or another point sop to make it so when the normal is between x and y multiply the color by 0.95 to get it to fade over time but was wondering what other ways I could try to do this. Cheers, JP ripple_example_1.hipnc
  5. Hey has anyone noticed how much the new interface for the polyreduce node has changed, below is pic 1: the new polyreduce interface, then pic2: is the old eone, then pic3: is what im trying to acheive but the new polyreduce node just reduces the poly but not the look of the overall objuect? can someone help please?
  6. I've laid out UV's procedurally in Houdini with the sweep or skin sop and using arclen on the input curves, but I'm wondering if there is a solution to straighten/unwrap geometry that is generated in ways other that using a sweep or skin SOP. If anyone is familiar with the Unfold Strip from Loop button in 3dsMax's Unwrap UV modifier it basically takes any edge or loop input and straightens out the geometry into a strip. It's super useful for cylinders and chamfered/extruded edges. I'm wondering if there is a workflow to do something similar in Houdini. I tried messing with the new FlattenUV node and I can get something kind of close with the enable loop straightening, but the UV's are still wobbly and not perfectly straight.
  7. Hi guys, I have imported a very simple obj from 3ds max and I am trying to apply a curl noise effect to the surface of it... I have played around with the amplitude etc but nothing seems to create very long lines and it looks pretty awful.... (I have attached an image...) When really I want to be getting an effect like the image below my image.... does anyone know why this may be? I am wondering if it is a scale issue perhaps? I want it to stick quite close to the geometry which has long trails but does flick off the geometry every now and then like my reference image.... Any help would be great! Thanks Matty
  8. Hey guys, how can I convert every letter of a text into separate geometry at geo level? I want to make a rigid body animation and let the letters should fall on the ground. Thanks
  9. I've unpacked the geo and converted it, When I try to selected and delete or group the polys I get the error "Attempt to access and object that no longer exists in Houdini" is there a way to delete individual polygons or groups? Thanks
  10. Hallo, I have following problem: If I shatter an Object in Houdini, the smaller pieces get an inaccurate guide geometry for the collisions. The Geometry Representation Type is: Convex Hull. Does anyone know a way to make this representation accurate? Would really appreciate it, as the smaller pieces are only spinning around now... Thanks, Zac ShatterGuideGeometryTestproj.hipnc
  11. Is Geometry Selected???

    Is there any way to verify if some geometry components selected?
  12. When ever I dive into my dop network, this weird piece of geometry shows. I have no idea what it is or why it's there. You can see in the second picture I hid everything but it still shows. The last picture is what happens when I try deleting it. It doesn't show when I exit the dop network. What can cause this? It happens when ever you add a pyro solver to a rdb simulation. In my included file, go into the dop network and you will see the same problem. The last photo is what it should look like. Thanks why.hipnc
  13. Hey!!! I am trying to add smoke to a shattered statue simulation. The falling pieces will emit smoke. I want the geometry to be deleted until the pieces reaches a certain velocity (if (@v.y < ch('threshold'));) , so that the emitter geo wont appear until the geometry is actually moving. That will keep smoke from emitting while the statue isn't falling apart. Finally, I need the geometry to be deleted when it is about to hit the ground, so I guess delete by Y position. I am trying to do this in an attribute wrangle. All the pieces have their own name attribute, piece1, piece2, etc. Here is my logic so far, I just don't know how to right it in vex: if (@v.y < ch('thresholdvelocity')) or (@p.y < ch('thresholdposition') then delete that whole piece. Any help would be appreciated. I am new to vex and I am trying to learn these things on my own, but sometimes I need help : ) Thanks edit: I can't add my original scene, but I made a sample scene. delete_geo.hipnc
  14. Hello everyone,I encounter a problem, I load an object in my scene. I noticed that my shift in the viewer did focus my object, so I searched on the sidefx helpers (I link the url) "http://www.sidefx.com/docs/houdini/basics/view [www.sidefx.com] “The solution I could find was the ”space + G".He walked once.Arrived at a certain level of my work, I had to use the procedure previously done.I come to my big problem.My object disappeared, leaving room for red stripes on my node geometry. I can not find where the error came from … it is not for want of having tried yet. Do you have solutions? I link you my project and the picture of the problem.Thank you in advance Pyro Smoke_v03.hip
  15. Hey guys, I'm just getting into Houdini (have been working in comp for the past 6 years) and I need help with a most likely simple question. I have some geo in my scene that I scattered a lot of points onto. I'd like to only keep the points on the Y axis. Like imagine a camera above the character looking straight down. All the geo it sees should have points scattered on it and nowhere else. Do that make sense? Any help on this would be great! I am hoping to take these points into a particle sim and use them to drive a smoke sim. Thanks!
  16. Hi! I have a strange issue. When I write many files at the same time, some of them breaks. It can be 200-300 files simultaneously size of about 10 Mb, or 70-80 files of 100 Mb - I have the same result: files exists, but 5-10% raise read error in Houdini. They have a normal size or less than normal on the storage. I tried this on the old storage and on the newest storage (with perfect access time, speed, caching etc) - the same result. Houdini 16 behaves just like Houdini 15.5. When I starting write this files, we have write errors on the storage from other software like Nuke or just write files from the OS. Another picture is not observed: when we write hundreds exrs from nuke - there is no file breaks on the storage. This occurs for many months, and I think the reason is in the method of writing files from Houdini. Is there a technology to change the method of writing geometry from Houdini (flags, variables)?
  17. Particles flying of geometry

    Hi, I am trying to make particles fly off a moving figure. so for example if he throws his arms in the air i want particles to fly of like sand. What is the best appraoch to this? I have tried using the trail node and attract pop but every time at some point no more particles emmit and just the ones that should fall to the ground are moved by the figure. I put a link to a flipbook render below. thanks test_Two_grain.mov
  18. Hi everyone. I've got a little problem, I'm trying to render my work in mantra, but the problem is that houdini reload the geometry for each frame and it's a bit long. When i render it in the render view everything works well, Houdini loads the geometry once and render each frame very quickly, but when i render it on the disk , he loads the geometry for each frame, and i don't know why. what i render is just a simple sphere instance on a lot of point , arround 10 million. Is there a way to cache the geometry for the render ? Thanks.
  19. Hi people! I'm learning some things in Houdini to create HDA's for cinema 4d or export vdb's simulations to render in c4d. In this case, I want to make a smoke simulation but I have one basic issue that I'm sure it solves with a simple way. I have one torus emitter inside of a tube but the smoke doesn't respect the tube geometry, It moves through it. How can I fix it? Thanks!!
  20. Hi all I have a question about exporting geometry using .fbx - Basically I want to export certain model that has been created in Houdini and render it in Keyshot, while in Houdini the model looks smoothed as shown in the pic attached sc_from_houdini.png but when i import it in Keyshot it comes totally black opaque and unable to receive new materials. I can overcome this situation by entering dummy (zero) changes to the geometry in Keyshot, which renders it able to receive materials and be rendered properly. Now, the problem I find is that once this first issue is fixed, the result of the render is showing the raw polygons and not a smooth surface as it appeared in the Houdini renders, as we can see on sc_from_keyshot.png attached. Anyone have idea what this happens? Perhaps I am missing some step before exporting the geometry, or exporting it wrongly? Sorry is not the same exact camera, but is the exact same geometry, I also attach here the houdini .fbx exported file ) Thanks in advance ) s.fbx
  21. Hey, I am trying to do some stuff in python with viewport selections. I want to query whether or not the user has anything selected, not necessarily get what is already selected. As far as I can tell the only way to do anything with the viewport is through toolutils. If I use "toolutils.sceneViewer().selectGeometry()" and nothing is selected, it waits until the user hits enter over the viewport before continuing. Is there any way to simply return whether or not any geometry has been selected without having to wait for the user to hit enter? import toolutils sv = toolutils.sceneViewer() geo = sv.selectGeometry() if geo: print "There is a selection" else: print "No geo selected" Thanks! James C
  22. Hi all! First post, sorry is not to contribute much but to ask for help, hopefully someone else with the same problem can read about this and find the solution here. I have a problem loading geometry in Houdini 16 running on W7x64, no matter what kind of file the behavior is always the same, to hang for a few seconds, then display the Cooking message for a (longer than it feels right) moment and then returning an error in the node. The dreaded message in the ! Error field of the node is: Unable to read file "C:/Users/userName/Documents/fileName.obj". This happens either via FILE > IMPORT > GEOMETRY and also popping the TAB menu, typing GEOMETRY and creating a new node, double clicking on it and trying to browse to the file via the floating file chooser input. I have already tried with many different files and file types, creating a simple cube OBJ and trying to import it, to make sure the file name does not have any spaces or numbers, I have even dropped the file in the $HOME folder (/Documents in my case) to ensure was not a path issue. I also have tried to check my houdini.env file to see if something weird was overwriting the program defaults (all is commented out, no actual environment variables there), even to add a PATH | path-to-the-houdini-bin-folder; to the system variables to no avail. The default.bgeo that Houdini uses as placeholder is loading without any issue, so not sure if this involve a path problem, my guess is more a geometry interpreter related issue of sorts. Additionally, Houdini gets all weird after the geometry is unsuccessfully loaded with constant freezes and even if I can get to select the node and eliminate it, the behavior of pressing space/alt to cam-navigate the 3D viewport results in a constant spinning around (!?). I have added an image displaying the error if its of any help, would be great to know how to get a workaround to this issue if someone can give a hand, thanks in advance! Eth.
  23. 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
  24. Replace fur by other geometry

    Hi, I just started learning houdini for my graduation work. Is there any way I can replace fur by other geometry? I am trying to make something like in the picture. What would be the best way to approach this?
  25. Hi all, I am trying to create an effect where I can take any high rez model and smoothly reduce the number of polygons so that it is high rez and smooth on one side, and very low rez and faceted on the other. This is purely for aesthetic purposes, as I think that look would be quite cool. The area where the transition happens should be arbitrary (ie. a group of points) but to keep it simple initially let's just say the transition happens over the entire model on the Y axis, so at the top it has the highest density of triangles and at the bottom the lowest. My initial idea for accomplishing this was simple - put down the model, create an attribute called 'weight' and assign it to points according to their position in Y, then use a Polyreduce with the Attrib Weight set to 1. Alas, this did not work. It reduces the mesh alright, but instead of a smooth transition I get a very sharp transition from smooth to completely faceted. Worse, the keep% parameter doesnt really have much effect on how faceted it is after enabling the weight attribute. Can anyone think of a better way to do this? im sure there is.. Ideally looking for something that could almost be a digital asset and would allow the most flexibility in defining where and how the transition occurs (ie. painting the model, groups, point attributes, etc.) Attached is hip file and screenshot for reference. (p.s. it takes a few min to cook at the current model resolution). Thanks! Smooth to Facet_2.hiplc
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