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Found 19 results

  1. Hi there, I am trying to project a texture onto an UV unwrapped object through the projection camera and then bake the projected texture on the original object UVs. However, when I do it, the uvtexture node gives me new UVs used for projection than the original object UVs. I would appreciate any tips how can I bake it out on the original object UVs. I attached my setup in a file below. Many thanks for any tips! uvprojectionbake.hip
  2. Box Mapping in Houdini

    I created this box mapping digital asset, because there is no simple box mapping option, like you would find in Max for example. This allows you to just rotate, scale and translate the box, and the mapping changes correspondingly. Hope you like it, Cheers!
  3. 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.
  4. Hi guys, I have encountered a problem while importing alembic files with UVs. They seem to be kinda rotated (right mesh) - on the left is the same mesh but exported as static .obj. Does anyone know how to fix this? I've attached the file if someone is interested Thank you alembic_import_UVs.hip
  5. I have an individual object that I need to copy to get a long shape that I will bend to make it circular. After the bend the external side is stretched and the internal is squeezed. Would you make the UVs at the individual object level? or for the full circle of multiple objects?
  6. First time I do UV mapping for a rock (was used to manual UV flatten for hard surface objects) This is a high (very high) poly rock (obviously not for games) I applied GameDev Auto UV, it has taken a bit more than 10 minutes and I got this: 1- How do I clean the apparently unnecessary seam cuts (in red)? 2- Does it look like a reasonable UV mapping for a rock? are there too many seams? it's meant to go to Substance Painter. 3- should I have applied the UV's when it was low poly? (I have 5 layers of noise, each time I want to add noise I subdivide first) At the end I added a close up on the mesh (822170 polygons)
  7. Long road, long cable, a bridge, a long wall, fence... most environment assets that use the copy sop create a challenge for me when it comes to texturing and therefore UVs. To make sure I get the most of the 0 to 1 UV space, I want to have one UV island representing the original geometry that has been copied, and place the UV islands of the other copies on top of the original and on top of each other. Any idea how I can place the UV island on top of each other?
  8. Hi folks, I was able to do alembic transport from Houdini to Maya for a scene which has a procedural vine/plant growth, how do I go about to maintain the UVs? kind regards, Clarence
  9. How to Transfer UVs to Vellum Grains

    Hey, has anyone tried this yet? In the past when creating FLIPs I would normally carry UVs through DOPs using an attribute promote to carry the UVs from vertices to points, but it seems like this is not working when applying the same methodology with vellum? Please help!
  10. This is a bit fx, a bit modeling, a bit rendering, so I'm throwing it here-- I am running sims on a tree model. The original tree was too hi-res to simulate, so I had to run Clean and Remesh to reduce its poly count a little bit. It still proved too oddly-modeled to run a point deform on the original based on the sim, but the sim'd model is still high-poly enough so we're going to use it as the final. What I need to do is transfer the UVs, in world space, from the original model to the down-res'd sim'd model. I tried using Maya's Transfer Attributes, which does exactly what I need, but choked on the source model's size. How can I do this in Houdini? (I know there will be some changes, but those should be mostly in the little tiny branches that are okay to lose, and this is not a hero tree.) I assume it will be something like storing the original models' point positions and then somehow applying those points to the end result of the sim'd/cached model, at which point I could do a straight attribute transfer (and although I get this theory I don't know the steps required), or is there a better way (and if not, how would I do my suggested way)? Thanks so much!
  11. Hi all I am trying to figure out how to do transfer of uvs (with correct seams) from low poly geometry to hi. Example workflow (works for me in Maya) and to the point I’m stuck in Houdini. Take hi res 3D scan > do poly reduce (gets low poly) > do auto uv > transfer UV to high poly. now this for me works all the way to attribute transfer (vertex uv) but uv edges (seams) are not transferred. I tried transferring uv_seams edge group (and it works to some point) but just can’t get those clean UV islands as in low poly. I must be missing something simple but I can’t figure it out. thanks for help
  12. Hello guys, i think this is a peculiar problem I have to "fuse" 2 meshes and VDB looks just perfect for the job. The 1st mesh is an orange (alembic) and it have some perfect UVs. What I did is a simple vdb setup to combine the 2 meshes + an attribute transfer to get the uvs from the orange but, unfortunatelly, it looks like some of the polygons are still connected in some parts where it shouldn't be. Does anyone knows a solution for this? I can't share the original scene so I've recreated it in a simple way. The original one have a face to mix with the orange. here's the images + scene file (with abc) in case someone can have a look at it Thx again, Alvaro UVs Transfer Problem.rar
  13. Hello dear community, I am just writing a little Python sop that can Unwrap a polycurve like a uvtexture node does on a nurbs curve with [Arc Length Spline] setup. My question is, what is the attribute name of the uv coordinate? I tried uv and uv[1] as its shown on the spreadsheet. Does anybody know the answer? Best wishes, Nicolas
  14. VDB maintain UVs

    Hello All, I am using VDBs to combine geometry and I am interested in a way of maintaining specific attributes from the two input geometries. Currently I have two poly objects which are being converted to VDBs and then combined using VDB combine and then converted back to polys using VDB convert. What I want is to be able to identify which polygons on the resulting combined/converted object comes from which input object and also maintain their respective UVs. I have had some success with using the second input of the convertVDB node to transfer attributes. Using this method however, I am only able to maintain some of the objects attributes, not all. I've attached some images and a file to demonstrate my issue. In the attached file I have three objects; Base, Add Sphere and Sub Sphere. All objects contain UVs and an ID attribute (tmp1), they are all converted to VDBs then combined using VDBcombine nodes. Finally the resulting VDB is converted to polys using convertVDB. When both original sphere are input into the second input, the UVs and ID attributes are transferred correctly however the Base object is not. When all three objects are input into the second input of the convertVDB, only the Base and one sphere's attributes are transferred correctly. I have tried several different combinations and methods of making this work to no avail, but it feels like I'm so close if I can get all three objects to transfer the attributes correctly, just not all at the same time. It is possible to use two convertVDB nodes, one with the two spheres in the second input and the second with all three objects in the second input, then deleting the problem polys from either (using the ID attribute) and then merging the two together, but this is not very ideal. In the image on the left you can see the results of the convertVDB using only the two spheres as the second input, the middle image is when using all three objects (base, add_sphere and sub_sphere), and the right is an image of all three input objects showing their UVs. I am new to VDBs so I was hoping someone might have some alternative methods or could point me in the right direction. Thank you all in advance! Cheers, -Mat VDB_attributes.hip
  15. Hi, I've been trying for a while to render to UVs, but with no success. Rendering the constant shader to UVs works fine, but any other shader just fails (clay, stone, ect). Only the polygons that are seen by the camera get rendered, the rest is just black/shadowed. Any idea on why this is happening? Thanks in advance
  16. Hi everyone, as the title says: I am importing a digital asset into Maya with Houdini Engine and, while everything seems to work kinda ok, the UVs are somehow different (and wrong) in Maya. I can't post the original scene for it is a production scene but basically I just have a bunch of tubes with polycaps and their relative UVs. I've attached a self explenatory image. Does anybody knows why is this happening?If so how can I fix it? Thanks everyone Cheers
  17. Hi guys, Doing with my first steps learning this marvelous software :-) I was under the impression that CARVE SOP will slice/cut our meshes (even imported ones) following the information derived from UVs. But now I see that this assumption was wrong… I understood what Carve does when using on Sweeps, Lofts, Birails… stuff created inside Houdini. On a next step, I decided to do some tests using Alembic geometry imported from Modo. My first results were great, because I imported some basic figures, like a thorus or a tube (and at these stage I will continue thinking that slice operation should be derived from imported UVs). But now, using a more complex imported geometry/UVs, I get unexpected results… Now I suspect that Carve Slice operation is derived from internal point order structure and not UV map. My question: is there some SOP or (relatively simple) procedure to apply a slice operation, like the ones produced by Carve, but derived from UVs information? I would like to get something like this mockup, slicing geometry through green and red lines that would be pairs of U and V coords, like the Carve SOP: Unfortunately, this is what I really get: Thanks for your help! :-)
  18. I import model from maya in *.obj with uv to houdini. Then export model in *.obj from houdini and open in maya. if uv was vertex type, then in maya all uvs are cut separate. If uvs was point type, then all uvs are conected.. uv are broken in all variants How I can export model from houdini and hold original uvs?????
  19. Hello, I am not sure it is a proper subforum, but... I have this situation: I modelled a path using curves and sweep SOP. The curve is resampled with even segments, thus my path have them as well. The polys making my path are more or less rectangular. Next, I assign UVs to the path using UVTexture (Rows and Columns setting). Now, I want to know hot to do several things: 1. Have each rectangular segment of my path take up all UV space. 2. Have each rectangular segment of my path take one UV space, assigned by primitive number. 3. Have a UVs looking like a strip of rectangles, with my path segments falling to one of those strip parts based on a rule (like rand($PR)) Now, how to achieve that? Thank you
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