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Found 42 results

  1. How to make paint/shell like surface?

    Guys, any idea how to approach this kind of effect ?
  2. Hi; I tried to create a surface out of my imported shape (e.g. a DXF file) using a "Planar_Patch_From_Curves" SOP, but it fills the inside shapes as you can see in the image below. How can I fix it? Thanks for helping. 2D_shape.hip
  3. Virtual Depth Sensors

    Hi - I have a ship that is behaving nicely with pretty realistic buoyancy on a Houdini Ocean. I would like to outfit the ship with sensors that will give me their depth below the ocean surface at any given time. Any ideas how best to do that? Thanks!
  4. I saw this video and wanted to replicate the effect for myself for and up coming project, and I wonder if I could get the effect to wrap around a poly surface or mesh.
  5. Hi guys, I'm using copy to point for architectural plan and I need my copied object always to perpendicular pointing to the inner side. Any help would be greatfull. Nemsi Copy2Point.hip
  6. Hi all, I'm looking for a solution for an RBD Problem. I'm trying to generate cracks on Object with the shortestpath SOP, which than wil be used to animate the growth of the crack and also will be used to cut out the crack deformation on the surface. In the next step I'm trying to create a first fracture along this cracks. If I use the data I get from the shortest path, my Fracture doesn't work because the Geometry is not Fractured completly trough. If I modify my shortestpath to generate my cutting planes, my pieces don't align with the "modeled" cracks at all. I'm sitting on this problem for more than 2 weeks now made no progress and I'm out of ideas. attached is my setup and a file which shows the idea worj´king but on a Flat wall not a round 3D Object. I already check this Form for solutions but I only could find topics where people asked a similar question but got no answer or topics which are old and outdated. I'm trying to create something simular to the Topic below. If someone could find time to help me it would be very much appriciated. cheers Cracks_with_Fracture_help_02.hipnc dm_wallCrack.hip
  7. Hit data in SOPs

    Hi, As the title says, I'm trying to make hit data in sops. To expand on that I have a sequence of points moving through a piece of geometry and I would like to create a point that lasts for one frame at the point of intersection on the geometry. Is this possible? I have a rough setup that uses nearestpoint and fuse, but the points I am getting are not accurate enough for what I am trying to accomplish. Mostly because the moving points are very fast and all have random speed. Any help would be greatly appreciated. Thanks in advance.
  8. Hi; I want to create a surface using two curves like the image below. Both curves are on the same plane (@P.Y = 0). What king of SOP should I use? Thanks for helping. Curve_01.hip
  9. particles on a deforming surface

    How do I get the particles on the moving object's surface to move along the object's surface toward a point on that object?
  10. Hello, I’m new to houdini, so I don’t know much. Is there a way to import particle fluid surface (water fluid displacement) into a displacement texture map? For example, oceanEvaluate node have "export to texture" tab and I can export displacement texture for FFT ocean. Is it possible to do the same for a particle surface mesh?
  11. Procedural Robots

    Hey guys, Wanted to share a setup I made generate procedural robots, here are some renders: Will post some more tomorrow, drops automatic geo from one shape and obj model as silohuette Cheers!
  12. hey! I'm looking into some techniques to move points along a surface where I define (paint maybe) the direction they should follow. any idea on how to do that? I was thinking on painting in some way some curve guides and then transfer the direction of the curve to the surface, and then maybe sample the closest point on surface to get the velocity I should apply to the points...but I'm not sure that would be the smarter idea...I was trying to stay away from uvs to get complete control over the sim without having to go back to uv layout... cheers!
  13. Hi all, I am currently attempting to create a network of interlocking curves that I can convert to a surface. Id like to effectively use the curves as a guide to create a nurbs surface. The problem I am facing is in areas where more than 2 curves meet any form of skinning seems to fail me. What would be the best method to create a surface between each of these curves? Thanks for your time guys! CurvesProblem.hip
  14. Hello! First time posting. I'm new to Houdini, this is my first project that I decided to do. But I'm a fairly seasoned C4D 3D generalist so I know what I want to do in Houdini, I just don't know how to go about it. I'm in Houdini 17.5. Here is the problem. I have stumbled around in Houdini and made a Viscous Flip Fluid Sim. I made a Sphere an emitter, and emitted my fluid pouring onto a .OBJ mesh that I imported in. I've cached the particle FLIP Particle simin the DOP network, the Particle Fluid Compressed Cached, and Particle Fluid Surface Cached. Now here is my problem. I exported my meshed sim as an alembic from a ROP_Alembic node. Imported into C4D. And then I realized I have a UV problem. This is a Redshift texture and shading pass that I did with my sequence. At the time I forgot to plug in the velocity data tags from the Alembic sequence into the Redshift motion vector blur, so if it looks weird, that is why. Crystal_Goo_Test.mov My texture smudges are on the mesh, but they stay static while the mesh animates. It looks just like the textures from this cartoon it doesn't move with it. So after a bit of digging I realize I don't even have UV's. Because Flip Fluids don't come with UV's, and if I never defined any UV's then how could they just magically appear? lol. So I tried researching how to generate them, and how to export them with the alembic. But for my specific situation I couldn't find anything that was up to date and worked. OR I am too much of a noob to implement what I saw in forum posts. The stuff I saw was for Houdini version 13, 14.5 and 16. I'm on 17.5. Here is a screen shot of how I tried to generate UV's and export them, again I never re-cached my sim yet. I just tried to put uv's on my existing set up. Below is my emitter. And there are no UV's on this sphere primitive, nor anywhere before the output. I took a shot in the dark and tried to see if I could generate them after all my caches (because it took 3 days to cache the fluid surface mesh). So I honestly have no idea where to generate these uv's, how to do it correctly, and how to get them passed onto the fluid mesh for alembic export and texturing in C4D Redshift. I'm including my .hip file with my cache's disconnected. They are over 200 GB's all together so it's too big to include here. Lower the substeps in the Flip Solver or lessen the Fluid Mesher to make it play back faster. I used high settings for my final export (also I tried my best to optimize, but again I'm a noob with Houdini and have probably done things incorrectly in my set up). Crystal_Viscous_Sim.zip The FLIP DOP cache might still need to be disconnected. This is the final step of my personal project. I've done all this on my own but I'm super stuck on this UV generation and export. And once I can export this fluid mesh an an alembic sequence for C4D Redshift I will be set to render. Thank you in advance for any feedback and/or answers. Please write out instructions very clearly for me to replicate if you don't want to provide pictures/ screenshots or .hip files. Again what I'm trying to do is generate UV's for my Fluid Surface, and have then be able to be exported via an Alembic sequence for texturing and rendering in Redshift.
  15. Hi, please see the attached Cinema 4D video of what I am trying to replicate in Houdini. I want to interactively position an object on a surface using handles. I made some progress with the Creep SOP, but it has several limitations: it deforms the source object, which I don't want it doesn't have viewport handles, so I have to edit the node parameters, which is undesirable (I have a lot of objects to manually position, so I want to make it as easy as possible) it doesn't work with polygonal objects I don't mind using VEX or an Attribute VOP to achieve this. Thanks. Slide_on_Surface.mp4
  16. Fluid surface UV question.

    Hi folks, I'm a games artist and am new to Houdini and I'm looking for a bit of workflow advice for an effect I'm trying to achieve. I'm wanting to make a melting head. I've got a UV'd head and I've put a skull mesh underneath that will be revealed. I've added a viscous fluid melt operator and the head melts and drips nicely. I would like to put it into UE4 as a realtime effect. The issue I'm having is that the melt mesh has changing topology and I need stable UV's so that I can apply my head texture to it. Is there a way to do this, either by taking the UV's at the first frame of the sim or by point deforming my undistorted head mesh to the simmed mesh. Or should I consider another way of achieving this effect? Any thoughts would be appreciated. Cheers, Paul
  17. Houdini Liquid Surface

    Hello! I would like to recreate the following effect: LiquidSurface.mp4.mp4 I want to apply an image texture (with normal, bump, roughness, ... maps) to a plane that deforms in the certain way that it does in the .mp4 that i attached as a file. Do you guys know the technique behind this?
  18. Attract/Morph particles to texture

    I have quite a simple question but haven't been able to figure it out yet. Using attribfrommap I have particles getting generated from a texture (e.g. circle). How can I attract/morph these particles to another texture (e.g. rectangle)? Thanks
  19. Hello! I'm working on a custom toon shader. As a basis I want to use the lambert lighting model as described in the tutorial embedded below. To test this I created a very simple scene with a sphere placed at the origin, a point light and a material with the material builder applied to the sphere (see image below). Now, here's the problem: The shading of the sphere is incorrect as soon as the point light has negative coordinates. It seems as if the surface_global's P and N are expressed in a different space compared to the point light's position. This happend with Mantra as well as Redshift (where I used the same setup as in the video below, apart from getting the light's position through a constant and channel references). Am I wrong to assume that P is the world position of the current point being shaded and N is it's normalised normal? Is this the wrong way to get the light position into the shader? I spent some time testing and searching on the internet but I couldn't find anything that clarified these quesitons sufficiently for me. custom_lambert.hipnc
  20. FLIP unstable border particles

    I am trying to get a calm puddle, and I have managed to achieve that in most of the fluid. Still, I can't get rid of this moving particles at the boundaries.... I've tried deleting them, but new ones will start moving until they get there... puddle_02.mov
  21. Hey! Could someone help me understand this? I have noise going into the vector displacement of a principled shader. Why do I have change the amplitude of the noise in z-axis to affect the y (up/down) position? If I do the same at sop level I can just adjust the amplitude in the y value. I tried messing around with the transform vop, but I didn't get anything working. Thanks displace.hiplc
  22. Hello, The title may be not that clear so rather then tell, I will show what I need to achieve first and then I will describe my approach (or better say approacheS, because I have been banging my head against the wall for quite some time with this). So basically here is what I need (did this quick and dirty animation in C4D): https://www.dropbox.com/home?preview=test.mp4 Now the tricky part is that this animation has to loop. Initially I started in C4D. Made some particles crawling along the surface of the statue, cloned some primitives on those particles and applied dynamics. It all works great but how do I loop it. Simulations are are very tricky to loop (especially in C4D) so I decided to go the Houdini way and try to build procedural setup that would give me similar result. My initial thoughts of the setup are the following: - scatter points on statue - make them move with the noise and use (minpos() function to stick them to the surface), and use periodic noise so the movement can be easily looped. - every frame attribute transfer normals of the statue to the moving points, so that when I copy objects they will be aligned to the surface - copy objects onto points and make sure there transformation axis is at the bottom so that when copied they appear on the surface of the statue - check for intersections with the statue (still not sure how to approach it but as far as I remember there is a way to see if two meshes intersect or not - if they intersect, move the object away from the statue along the normal of the point it is copied onto (I think this will have to be done in solver so that I move it slightly and then check for intersections again, because the distance the object has to be moved may differ) - I still do not know how to avoid intersection between all the objects on the statue themselves ( do not have any ideas so far) For now I am stuck on trying to loop the movement of the points. I can loop them easily in 3D space but when I minpos() them on to the surface they jump from time to time. I understand why this happens but can't figure out how to avoid it. I tried attrib transfering the normals of the statue to the points every frame (in solver) and then calculating the cross product between normal of the point and vector generated bu the noise. This gives pretty smooth movement but the loop breaks of course as you may have guessed. Anyway, thanks for reading this far. If you have any ideas on how to make it work, please let me know, I appreciate any input. I have posted same question on the SideFx Forums on friday but it is still been reviewed (takes so long). Maybe I am overthinking things and there is easier way to do it say in C4D, in case you know it, please let me know. And do you think my thinking process is somewhat right? Looking forward to any help. Have a great day everyone!
  23. Is it possible to control the "surface stiffness" of a granular sheet, so it will act like a sheet of paper or another stiff material?
  24. 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
  25. 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