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Found 76 results

  1. mandlebrot color issue

    i created a mandlebulb/mandlebrot and i want to animate it with colors that change like left 30% green right 70% blue and it changes over time. I do not know how to accomplish this. Please help. mandlebrot_016.hip
  2. A simple question perhaps - I am getting my head around the nodes representing "blend modes" in a shader: One of the most useful blend modes in Photoshop, Mari etc. is Overlay. How do you guys recreate "Overlay" in a node graph where you only have Add, Subtract, Multiply or Divide?
  3. Hello gents, I was pointed to these forums by one of our Houdini TDs. Myself I am a texture artist/3D generalist eagerly diving into Houdini for the first time (while being in a production, as it happens). My question: So I have a piece of terrain generated by the new Height Field nodes (see attached image). Lovely. What I want, is for the mask data (the red in the 3D viewport is an example of one of the masks based on height) to drive the shader live, not through a static exported image file. As I see this problem, how do I cross that divide (from the SOP (I guess) world to the SHOP (or is it VOP) world? One suggestion I have received was to use the Attribute Promote node, to sort of flag the data I want on the geometry side, and using a Bind node on the shader side to bring that data into the shader. In reality I haven't managed to make it work. There are around 18 different attributes on the bottom most nodes - which one to flag? Is it a data conversion type problem perhaps (trying to fit a round peg into a square hole)? Or do I need to bake the HeightField into actual geometry first perhaps? Or am I looking at this the wrong way around? I sincerely hope you can help...
  4. Hi all, I'm getting strange artifacts rendering a flip simulation with the PBR shader set to glass preset. As you can see there are lots of flickering and some features of the mesh even go in and out. If refractions are turned off the problem disappears, however the desired look is no longer achieved. The problem is not present on other presets such as gold, etc. Im guessing this has something to do with how the particlefluidsurface node meshed the sim, being inconsistent with the inner features or something like that. Is this a known issue or something anyone have come across? Can you think of anything to help me resolve it? Thanks in advance, Glass_Test_s.zip
  5. I have a small compositing network which I want to reference as texture in the shader using the op: expression .ie op:/img/trail Even though I've managed to make it work several times, I always find it a bit flaky and many times mantra doesn't manage to load the image, even though it may be visible on the viewport when referencing the same image operator in a uvquickshade node, or just by loading the shader. It works with a principle shader out of the box, but if I put the same shader within a material builder it breaks. Is there a render attribute or something else I need to add to the shader? I understand it's better to use pre-rendered images the normal way, but I want to use dynamic heighfields SOPs for textures and ideally avoid having to write out thousands of frames in advanced.
  6. Edge Dispalcement Shader

    With the new tutorial I am trying to somehow get this to work with default mantra, like the original tutorial, But i have some issues, hoping someone will point me in the right direction. I have attached the hip file here hoping someone will download, and correct it and show me how its to be done correctly for mantra. EdgeDisplacement_01.hiplc
  7. Hello!I am having a few bugs with the houdini toon shader.In some scenes it appears as though there are two objs on top of each other and intersecting, when there is not. Also, some parts of the model are just black under lighting while others are not.Has anyone come across this? If so does anyone know any ways to fix this? Thanks
  8. Hello! I am trying to create a shader with the Arnold VOP network that is comparable to the ocean volume mantra creates when the ocean toolkit is used. I have Arnold experience, but am having a hard time finding resources related to rendering volumes with Arnold (that are free, I'm a student on a budget). Any help would be appreciated, thank you!
  9. Procedural Veins material?

    Hey guys, I don't have a lot of experience in SHOPs yet so I'd like to see if someone could give me some ideas for this. I'm developing a procedural eye and I'm able to do it's veins procedurally on SOPs but I guess it would be much more useful if I could achieve something in the shader, maybe using some kind of noise. I don't know. I'm kinda stucked in the beggining so I just need any kind of ideas here's a good reference (I like the thickness variation)
  10. Flip rendering

    Hello everyone, I'm beginner in water simulation and I would like some tips if it's possible. For the simulation part, I'm not in trouble for the moment, but the rendering it's another thing. I'm trying to make an ocean flip simulation of a submarine going out of water, for the ocean shader, I have something pretty good now with ocean spectra and the ocean shader of houdini 16. The problem is the whitewater, for the ocean surface (the flip mesh) I don't know how to do the white part like in the sreenshot, is it particles, or tweaking the shader with velocity or vorticity, but which parameter in the shader (refraction?) ? And for the foam, spray, bubbles , I have to render simple particles or do another thing? Thank's for your help, I want to learn water, it's very fun to do! I let the breakdown of the screenshot here
  11. 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
  12. I almost never rendered with Houdini but thought of giving it a try... Essentially I created an Octane material and applied it to my geometry but I want the diffuse colour of the shader to be the colour of my points geometry (and not the colour selected in the shader node). Im assuming it's a pretty basic thing but couldnt find a way to do it (played with material override etc.) ... maybe Mantra gets it automatically (seems a sensible thing) but not Octane. In layman's terms I coloured a series of geometries using some gradients and random values (my points have @Cd attributes). Then I created a standard Glossy Octane material. I want my objects to have the properties of the Octane shader (reflection, roughness, opacity, ...) but use the @Cd attributes in the geometry to drive the diffuse colour. Thanks!
  13. Hey guys, I'm new to mantra, made a material and I'm trying to animate, for example changing te offset on the noise or the displacement amount, but seems not having effect (i'm renering in mplay), also tried promoting parameters with no luck. Displacement says: cannot have channels wich depend on time Also Im trying to get the artifacts out, added some dicing to geo node as well as in rop, should I increase more? Thanks! mantratestanim.hipnc
  14. Guys, I guess it might be a veeery silly question but I just can't do it. How do I display textures on viewport? In this case I have this ramp applied (not an image texture) Thx! Alvaro
  15. Hello all, I am trying to figure out how to create a procedural shader that looks like sand (Applied to geometry, not particles) Are there any posts that you guys can point me to that would help me know where to start? Thank you Sand shader for dunes_v01.hip
  16. Hi guys I recently created a free asset to test shaders in a consistent environment regardless of the scene I am. I am kind of old school and feel a consistent shading testing area is very comfortable to create different shaders. The idea is that no matter what complex scene you are in, you can just bring this asset and then test render shaders on a tri light set up with background and env. light. The asset itself is very flexible. multiple shapes test, and grid or plain background. You can even bring your own object or shader ball into the scene. You can find the asset here: https://www.orbolt.com/asset/Butachan::nh_shadertest::1.0 Please read the instruction as I made the asset object, light camera, and actually everything invisible in the scene so it doesn't really clutter the scene you are working. I also made it open because as it is a render related asset I feel it will need some tweeking here and there to adapt to your needs. Bests, Nico.
  17. Hello guys, I'm working on a Bifrost liquid mesh that I imported into Houdini to render it with mantra since Maya couldnt manage my huge alembic file ( +300Gb ). There is no foam yet since it's in the process of meshing but I wanted to know what do you think about the liquid mesh shader ? I used the Ocean material from Houdini with some adjustment. Thank you guys!
  18. I want to make a shader using attribvop or, simillar shader thing in SHOP. I made simple hip file and attached. If you guys have time to answer, thank you all shopTest.hip
  19. Similar to the H14 workflow of hitting X on the currently selected node in any vop context to create a visualizer node, I want to do the same but connect the currently selected node to the compute lighting Ce output (or a bind export node set ot Ce but that can throw errors) to quickly visualize the color data of the map I am working on without having to do expensive shader calculations. The visualize node is great when working with Cd in SOPS but does not return the same functionality in shaders This is a default hotkey in arnold for C4D, its like alt+w+v or something. I'm sure there is a way to do this with a python script attached to a hotkey. Any ideas?
  20. Hello! I am making a geometry deformer to simulate large waves for a student film (we don't have the resources or time to sim out a large tidal wave), and I'm having difficulties with the shader. I'm starting with the default ocean shader to get a feel for it, but the displacement and creation of the white caps and foam are being stretched and look wrong due to the deformer. My thought process is, is there some way to include my deformer in the displacement process so it is factored in when white caps/foam are made? If not, is there some other way to effectively use the ocean shader on a deformed grid (without losing the white caps/foam)? I'm really hoping to be able to have the white caps/foam on the crest of the large wave the same way it appears on the small waves created by the ocean displacement. My files are attached, I apologize for the messy VEX in the hda, I've been hopping between VOPs and VEX in its development. Also note: the displacement maps are set to .picnc instead of .pic because I am working in Houdini apprentice currently. Thank you! displacementworkaround_v01.zip
  21. Compile VEX code to VOP network

    Hello guys, I have a question about how to compile my VEX code to a VOP network by VCC complier? I know there is a mode "-m" before, but it isn't work now, How can I do this in Houdini 15.5? yuqing
  22. Flipsurface and ocean shader foam

    I made flip sim with splash container and ocean spectrum. I transferred uv from ocean grid to flip surface and made custom foam mask. But when i use oceansurface shader foam looks not the same as on the ocean. It strobing and fast change structure. I made simpl scene to check, if someone can help me to understand what is wrong ir would be great. Thanks! test.hipc.hipnc
  23. Hello! I am currently working on a project that has the majority of the image is refracted through a ocean spectrum surface. The problem being that I am unable to get AOVs such as point position, depth, and diffuse for the objects that are under the surface. I currently have a work around, where I have created utility shaders to enable control of the elements under the water surface. However, this has resulted in having a different render for each AOV needed! Does anyone have good approach to accessing the refracted objects AOVs? The current approach is a bit cumbersome and time consuming. Any advice would be much appreciated!!
  24. Here is a simplification of my problem: I have two side-by-side volumes, and one of them has voxels that are twice the size of the other's. Or, another way of wording it – I have two volumes that are the same size, with resolutions e.g. 10x10x10 and 20x20x20. When I render the image, there is a seam between the two volumes. This seam is not there if the two volumes were have the same voxel size. How do I remove this seam? Is there something I can do in the shader? seam.hipnc
  25. Mantra shader emission issue

    Hi, It seems i cannot get the emission to work anymore when using a mantra shader or a material shader builder. The object doesn't light up nor illuminate other object. It works fine with principled shader tho. The project i am working on needs object to evolve thru attributes from emitive to refractive If anyone has a tip or a work around it would be apreciated Thank