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Found 19 results

1. ## Matching normals movement

Hi guys, I've already posted this on FB group with no answear so you're my last hope. I have a problem with normals demonstrated in the video, basically object animated on a curve and aligned to the curves tangents hits a geo and gets stuck in it but it doesn't rotate along with it. So basically the question is how can i match the movement of normals of the object beign hit and hitting so that it rotates properly? Here is simplified .hip: link
2. ## Ocean surface problem

Hi, I'm creating water simulation via "Guided Ocean Layer". My problem is in surface of the simulation. I need to keep surface the same or close to the first frame all the time of simulation. The pattern of the simulation is from Ocean spectrum and wavetank. The problem is that through the time of simulation the surface loses quality. Pictures listed below. Are there any options how to keep the quality of the surface in DOP of simulation? Thank you for your advices. Vojta
3. ## surface Distance from Surface Field in VOPPOP

Hi everyone. Does anybody know how to use surface field in voppop or some dopvop to find the distance between my particles and surface. I want to make a force wind that depends on distance between surface and particles, so the farther point from the surface, the stronger the force of the wind. And the surface has really big waves for example, thats why i cant use just P.y for power of force for flat surface. Hope I explained it clearly)
4. ## Using Volume Mask in Particle Fluid Surface

Hi all, Does anyone know how to use the mask input option to smooth a part of the mesh inside the particle fluid surface node? I want to specify with a volume (ie. a bounding box) which part of the mesh to smooth or keep (instead of using the velocity or vorticity mask). I created the volume to mask with (just a box turned to vdb) as a separate OBJ, I am then object merging it and connecting it to the third input of the fluid surface node, then in the filtering tab in mask input I check it and put in the name of the volume. I have tried to do several different things on the volume itself (regular VDB, Fog VFB, etc.) and nothing seems to work or make any difference. When I turn visualize mask on all it shows is nothing is applied to it (ie. all of the surface has 0 smoothing applied to it) How do I properly use this feature and get the node to recognize the mask? Am I going about this the right way? Many thanks, CrownSplash Anim C.hiplc
5. ## Ocean Surface H16

Hello! I can't get to work the new ocean surface setup, even with the provided scene files. I the viewport it's seems fine, but it renders flat. (and without the foam) Yes, I baked the spectra node. Can anyone point me in the right direction? There is none learning material about the new ocean surface, not a single tutorial, only the masterclass. Thanks
6. ## [Solved] Exporting .FBX smooth surface geometry

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
7. ## Detailed displacement?

Hello community, I'm trying to figure out how to get this effect, im pretty new to houdini and my thoughts are with some noise and displace along normals, I played a lot with vopsd and solver but I cant get the shapes and amount of detail, could this detail be done in mantra? (just wondering, I would prefer to do it just in sops) Here is the video (min 7:39) Any tip on how to achieve this kind of pattern/displace will be great, thanks!
8. ## relbbox in surface context

hi, I try to work with the relbbox node in a shader just like in sops but it doesnt give me the desired results. The picture below shows my network in the shader which I thought should give me a gradiant from bottom to the top of the box. But it looks like that I´m missing something. I read that P in shading context is P in camera space. But converting it from cam to obj space also didn´t change anything. I would be thankfull for some help here.
9. ## Any idea of how to achieve this effect? (line following a surface)

Hey guys, Anybody knows how can I get this effect? maybe with attribute transfer? I tried doing a plane with 10-1, resample, unroll, then tried to deform the body with ray sop and with attribute transfer with no luck. Maybe with particles that flows until touchs the surface and then continue?, I also tried doing a bunch of planes with a cookie sop but I get a mess. I'm also attaching 2 more samples that are similar, I'm more interested in the girl body one, I dont know why but I have the feeling that an attribute transfer may be the way to control at least the face, but im newbie. Thanks!
10. ## Sample NURBS Surface normal at uv?

Hello, is there a VEX function for sampling N at arbitrary location in NURBS surface (based on uv location for example)? One way would be to convert NURBS to polys and get normals from them. But I thought that maybe there is easy way of getting N directly from NURBS? Thanks, Juraj
11. ## Deform Scatter over Surface of Geometry

Hi, I have been trying to deform scatter point over the surface of the geometry, What would be the way to deform or slide scatter or give slide scatter points with offset over time on the surface of the geometry ? I have tried with color texture and it worked, but i am looking forward for the VOP method, can someone guide me over that ? I am still to houdini and trying things out. Thank you,
12. ## fx Growing attr on surface

Guys! Need your help! I stock.... Here is my issue. I have some particles that when impact with the surface (grid for example) create attr (marked as red for example). My task is grow this attribute by the time on surface in differnt directoins. I understand that effect can be achive by using SOP Solver, but can't understand for now how to do this. Explaning about how to make that happen will be highly appreciated! I attach hipnc file with my problem. Thank you advance guys! growing_attr_002.hipnc
13. ## particles on surface transition

Hello, I'm trying to control some particles, I need them to travel on a ground, toward an object, then creep up on that object surface, when they reach it. I've tried a few method (creep, ray, slide on collision ...) but even if I manage to have them slide on an object surface, my problem is how to set up the POP network in order to have them transitioning from one surface to another. I've cheated with a P.y = 0 in order to have them on the ground with ease, but I'm failing at controlling a nice transition from ground to object. here is a basic setup, without much, in order to not restrict the different approaches . Also, I'll replace the particle with a small disk later, so I think I need them (particles) to be oriented properly. Thanks for any advise and help! prtcl_slide_4OD.hipnc
14. ## Ocean Shader test | Need some feedback

Hello guys! I'm some kind of a newbie to Houdini but not really in the 3D field. I would like to have some feedback and your opinion on my ocean shader. It's a simple scene which will be animated with a camera traveling toward the horizon, I use it to learn more about houdini ocean shader. Here's my shot : It's been few days I'm struggling with this one, so any feedback is more than welcome! Thank you guys, have a nice day.
15. ## How can line blend match surface?

Hi,I'm copy bunch of line on a model,how can i use vop blend line to match surface? I'm play with normal and tangent ,still can not work out. Please help me ! thank you very much!
16. ## Texture info from closest surface project on Point's Cd

Hi Guys, I have been trying to get my point's cd from a mesh with texture. I seen alot of method around that are using attribute promotes from vertex UV to points UV. However the UV I promoted are slightly off. I wonder if there's any way that I can use a vop to get closest surface texture's color info and project them to my point cd? Very much thanks and appreciate any help from you guys. I have attrached my file. texPoinntTex002.hip and the obj file (testAlembicCon.hip), just have to change the extension to.obj will do. texPointTex002.hip testAlembicCon.hip
17. ## Water surface tension when fish jumping from under water surface.

Hi, I'm working on water splash for my graduated thesis in school. So far, I couldn't make water surface tension, so I just put emitter on top of fish and spreading water. But it doesn't seem having any surface tension and just looks pouring water. This is my work so far. http://vimeo.com/87121114 I would like to get water tension when fish is jumping from under water surface as following reference. Could you guys give me any advice or suggestion to have natural water tension as the references? Thanks
18. ## Close a curve without "creating" a renderable surface

Is there a simple way of closing an open curve with out creating a renderable/visible surface. After closing the ends I just want to get a simple like the circle on the right. The Ends Sop creates a surface..How can I avoid this? Is placing the first and last points at the same position the only solution? Btw the curve is animated and random pointnum sorting. Can I somehow get for every frame the pointnum of my first and last point so I can push them in the same position?
19. ## flip fluid surface tension

I've been playing with flip fluid for a bit now and the one thing I can't seem to figure out is how to enable surface tension in the simulation. Adjusting the surface tension of a liquid is something I do pretty often or have the need to change (when I'm working in naiad or realflow). In houdini I thought it would be an easy setting to find, either set on the flip object or set on the solver but I doesn't seem to exist? Has anyone ever been able to simulate surface tension with flip?
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