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Found 41 results

  1. Noise difference in H16.5 and H16

    Hi guys. I moved a project from H16 to H16.5 which already had specific looks designed with mountain SOPs in H16. In H16.5, the same settings yield a totally diffrent noise as much as I am not using the new noise types! Any workaround to achieve the old displacement from H16 but in H16.5?
  2. Noise difference in H16.5 and H16

    Hi guys. I moved a project from H16 to H16.5 which already had specific looks designed with mountain SOPs in H16. In H16.5, the same settings yield a totally diffrent noise as much as I am not using the new noise types! Any workaround to achieve the old displacement from H16 but in H16.5?
  3. Noise as Texture?

    Hi, Is there a simple way to use noise as a texture for the principled shader? It's looking for a string file path. In Maya, you can create a noise texture, which creates a texture and placement node. You can connect it to the color of the material. How would you do this in houdini?
  4. apply noise to flip fluid source

    Hey! I'm trying to replicate some sort of noise on my flip fluid emission volume in a volume I can use a volume VOP to multiply the density and create some interesting shapes that change over time, but when I emit flip fluid I have this fluid source and I couldn't find a way of eroding it to get a much nicer and organic shape. I'm introducing some noise on the emission speed and that works well, and also I'm applying a mountain SOP to the original shape to break the surface, but I still miss some noise on it. Any idea? fluid_source_noise.hipnc
  5. Hey guys, I'm new into vop's and wonder why I dont get any result, when distort the nomals through an turbulent noise node? Is there any tutorial which covers the vop basics? Like what the colors mean and what datas need to flow through nodes to get results? Thank you for your help
  6. Hi Everyone, Just had a quick question that someone could maybe help me out with... What is the difference between turbulent noise using the perlin function and using aanoise with the perlin function? aanoise seems to give you values in the negative and the turb noise has different fall off due to the attenuation calculation on the node, but what would be the main reason to use the one over the other ? besides the default starting look ? Are there any speed or render noise differences? Many Thanks R
  7. Noise Control using Colour

    Hi, I am trying to control the frequency of noise using a colour attribute. I have managed to do this on a grid but I cant figure out how to do the same using a volumevop. My goal is to be able to control the amount of detail/scale in specific areas of the model. Im not sure if this is the right way do to this but the example image shows that effect I'm trying to achieve. Thanks Noise control.hipnc
  8. Hi, everyone. I'm new to Houdini. The question that I bring to you is not mine. I found it in the comments in a tutorial about Houdini volumes and would want to know the answer also. The question is: Is there a way to animate character made of volume and keep its volume noise parameter in a right place? As far as I know the volume noise is based on position, so animating it we are moving character, but noise is stable in its position. We could scatter points inside a volume in the base position and write it down using the attribute, then we could create volume out of particles and use our noise attribute to be read out of points. Is it possible, or I'm just making an unnecessary noise ;-) Best Regards, Tom
  9. Hi, everyone. I'm new to Houdini. The question that I bring to you is not mine. I found it in the comments in a tutorial about Houdini volumes and would want to know the answer also. The question is: Is there a way to animate character made of volume and keep its volume noise parameter in a right place? As far as I know the volume noise is based on position, so animating it we are moving character, but noise is stable in its position. We could scatter points inside a volume in the base position and write it down using the attribute, then we could create volume out of particles and use our noise attribute to be read out of points. Is it possible, or I'm just making an unnecessary noise ;-) Best Regards, Tom
  10. Hi, I'm a beginner at Houdini so forgive me if I am not familiar with a lot of things. I have converted some moving geometry (alembic) into a cloud and it is moving quite quickly. I want to be able to alter the animated noise effect on my geometry so that it doesn't use world space noise as it moves too quickly. I understand that this effect works well with slow drifting clouds but my geometry is not moving slowly. If I can't alter the rate at which the noise animates then I would also be interested in removing it entirely. At the moment I am using a cloud node and a cloud noise node. I'm unsure about how to achieve this so any help would be greatly appreciated!
  11. Hey guys, I'm trying to drive a animation with noise and I need the numbers to be intergers from 1-4, tried in vops to fit range and clamp but I can't figure out, I get floats animating but cant make them round numbers. Also, there's any possibility to keep the smooth animation of colors (this will drive polygon subdivisions) with intergers somehow? Hip attached, thanks in advance! Cheers! noiseint.hipnc
  12. Hey,Idont quite know how the noise settings on the uniform volume shader work. I used the volume extrude to create a box and added the shader. I thought the noise settings would affect the density of the shader. There isnt happenning anything when I try.
  13. Seamless Noise VOP asset

    Hi! I'd like to share a Seamless Noise VOP asset that can generate seamless 2D Perlin, Worley and Voronoi noise. It works in any VOP context, e.g. COPs to generate textures or in SOPs to generate displacement. You can download it here: http://techie.se/?p=gallery&type=houdini_assets&item_nr=2.
  14. Divergent noise

    As the title suggests. Im trying to achieve a diverging noise pattern in a cone shaped volume for a project I am working on. As far as I know, this effect is not possible but I have been proven wrong before. Can the example images I added be accomplished? Points or volumes, it doesnt matter, as long as I am able to have the noise diverge in the direction of the cone width. Any help would be appreciated. Thanks in advance.
  15. Indirect reflection noise

    So this might be a question of mantra settings in general but I am having problems getting rid of indirect reflection noise, it seems like no matter how high my settings this pass is coming out extremely noisy and it is showing up in the final render. I have read through all the docs regarding noise and read through the forums but since mantra changes with every release I don't know what information is still relevant. For instance I read the practical upper limit for pixel samples was 6x6 unless you have heavy DOF or motion blur. I have no idea what extreme settings would be for anything else though like sampling quality on lights or min/max pixel samples. The docs say in some cases you have to increase min ray samples for indirect reflection/refraction noise, but I read elsewhere not to increase that. What is the workflow there, when should this be increased? And how does that affect reflection/refraction quality, which seems to be a global multiplier? Also on the noise removal docs it says as an example 100 max indirect ray samples to achieve a clean image, is that referring to "enable indirect sample limits" rendering parameter on a shader? Is there not a more global way to set that or is that what sampling quality on each light is doing? However increasing that per light doesn't seem to make any difference. I should mention I come from a vray background so that is the workflow I am used to, if anyone can draw any parallels. Also this actual scene doesn't really matter, these are more general questions about newer mantra settings and when to tweak what Quick info about my scene- Still image, no DOF or motion blur, no environment light, just 3 area lights with sampling quality of 9 I do have some fine displacement which might be part of the issue, set shading quality to 3 on that object. Here are my render settings (refl and refr limit at 5, no diffuse bounces, color limit 5). Everything else is default Indirect reflection pass- Here is the comp zoomed in a bit, you can see there is visible noise on the black spheres and the displacement, there is also some square artifacting happening, my guess is the displacement is just too fine for mantra to dice properly resulting in a moire pattern type of effect but that wouldn't explain the square artifacting (that is in the raw exr, is not jpg artifacting) Any help on this would be greatly appreciated
  16. VDB grow

    Looking the way to make this beauty I did some setup, but unfortunately, I'm loosing something important because I can't make the same or close shape, I mean thin and long. My setup is working for shapes like corals - massive, expandable, cone.... Thanks for any advice, the scene is below. grow_v001.hip
  17. Advanced noise workflows

    So this is more of a general inquiry of some good workflows rather than a specific question but I am trying to make detailed grunge maps essentially in houdini and I was wondering what some advanced workflows for generating complex procedural noise and general patterns might be. Basically I am trying to recreate some of the things people have been making in, for instance, substance designer, while staying in Houdini. A couple examples- some of the grunge maps from substance. I'm sure a lot of them are texture based which I would like to try and avoid but not at all costs https://share.allegorithmic.com/libraries?by_category_id=15 making something along the lines of the popcorn noise this from Mari (like the sparse cracking patterns)- https://vimeo.com/103744817 or this where they talk about the multiFBM features, towards the end when they start to get really complex- https://vimeo.com/72116387 Then not necessarily for grunge maps but some of the colorful abstract stuff lee griggs has been doing with those xgen renders. Not necessarily how he did the effect but moreso how he generated the color patterns they were based on http://www.leegriggs.com/xgen-rendered-with-arnold-for-maya Then the gobstopper-like layered noise happening here- https://vimeo.com/163668854 I know you can do things like distort the position coordinates of a noise with another noise, and you can create an FBM type swirly look by pumping noise into the translate of a transform matrix and then piping that into another noise, and then you have things like multi-fractals in a for loop and unified noise with built in fBm but that all still looks very CG to me and still falls shot of mimicking real texture maps, which require UVs and can have noticable tiling and repetition etc. So there is that, and then a lot of stylized procedural patterns interest me so just looking for some good workflows to accomplish some of these interesting effects. Thanks
  18. Hi, any help with this would be awesome. I can randomly emit particles over time with an expression. I can adjust the frequency and offset the values, but is there a way to control or limit how long each random emission lasts? Imagine a sputtering hose, but each stream that shoots out - can only shoot out for 5-10 frames. Much longer than that and it all joins together to form a solid looking stream. I need random blasts, that are limited to 5-10 frames each. Thanks! Andy
  19. H15 Pyro 3 Noise

    I am having trouble getting noise working with my pyro sim in Houdini 15 with the new pyro 3 shader. I might be doing in wrong. I have enabled rest field in both my pyro solver and in my pyro object node. After enabling noise to my Fire Intensity Field, I get no noise even when I have dual rest fields. I have tried this for the Fire Temperature field as well. I have attached my renders with and without noise, my settings, as well as my hip file. M y goal is to get some more small color variations in my explosion post-sim. volumeNoiseHelp.hip
  20. Hello, I'm trying to displace the surface of a VDB along it's Gradient/Normal, to expand the functionality of the Orbolt Rock Generator. I followed the way it is shown at the end of this masterclass "Working with Noise". Any scaling parameters don't seem to have any affect in H15. The setup in this tutorial seems broken to me. I need this to work with a Unified Noise set to Alligator. In all attempts of me trying to recreate the approach from the masterclass, the Unified Noise only seems to displace into a world vector direction set by the "Final Amplitude" and not along the Gradient/Normal. Any help appreciated, Magnus ShapingNoise_Volumes_003_ODFORCE.hipnc
  21. Hey, could someone help me building this curve in chop ? I need a curve, a noisy curve with a positive slope. I managed to do that with a pulse (set up to get a positive slope) and adding a noise to it. But the final curve I need has to be like this : (never going down)
  22. Cloud Noise stick to object

    I've searched the previous threads already, and read on most methods, but is there a solid way to get the noise property of the cloud noise to lock onto deforming geo ?
  23. Hi guys, First time posting in here. I am a beginnner to intermediate Houdini user who is just recently diving into it deeply and just have a simple question about Uniform Noise at the Material level. Currently, I am going through a tutorial that is done in Houdini 13, I believe, on creating textures. They put down a uniform noise node in the Material VOP network and use a slider for "Exponent" to adjust what seems to be the contrast of the noise. I am using Houdini 15 and since things have changed so drastically since then there is no longer an exponent slider. I tried playing with the options that are there and messing with the fit rang (unclamped) node but nothing seems to get the same effect as in the tutorial which is one I would like to use for an idea in the future for padding. Is there something that replaced the exponent slider that I may be missing? Thanks in advance for any replies and help.
  24. Hi, I've been trying to figure out a way to get patterns that look like these for a shader. Anyone have any tips or have achieved this before? Or if you have a way to do it in geometry, that will work too. Thanks
  25. Hi guys. I'm doing some tests using shader light emission based on Niels Prayer SciFi Fractal tutorial. But when I pull the values up and use just shader light emission with no other lights I see a lot of noise. I can increase the pixel samples but it increases a lot the render time. I would like to know if its possible to just increase emission light samples to keep pixel samples moderate. Thanks Myke
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