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Found 32 results

  1. Hello everybody, I'm new here, and i hope i'll be clear to explain you my problem. I made a moving flag on houdini. But now, i try to apply some material to it. But what happen is my material is filling the hole between the moving rope/flag and my flagpole. The Flag is made of two parts: - The rope (on the left in houdini screenshot) - The flag (on the right in Houdini screenshot) The two are merge together, and after i applied some vellum constraints, vellum solver and file cache. It worked with houdini/mantra material, but not with octane. I guess i'm doing something wrong. I let you some screenshot, hope it will help you. Thank you! Take Care

    Hello dear Computer grahics friends, I wish you all the best for this year, full of RBD destructions, magicals effects, cloth sims ... I start this year with a very boring subject as rendering octane render images using with PDG and HQUEUE on windows 10 My jobs are running successly even if at the end I don't have any output images. Log erros: *** OCTANE API MSG: Could not load 'Q:\RESSOURCES\TEXTURES\EnvMap\substance\sequence\substanceHDR.001.exr:rgba'. [Octane] 12:46:00 INFOR: [save image] -------- Saving the EXR "Q:/PROJECT/dev/04_3D/assets/Exterior/render_farm/MDL/work/houdini/scenes/Model/render/render_farm_Model_withOctaneNode_v001.Octane_ROP1.0001.exr" file *** OCTANE API MSG: OpenEXR: Cannot open image file "Q:\PROJECT\dev\04_3D\assets\Exterior\render_farm\MDL\work\houdini\scenes\Model\render\render_farm_Model_withOctaneNode_v001.Octane_ROP1.0001.exr". No such file or directory. Work around: If i switch manually all my paths from the server letter to the UNC path, evrything work fine. View with the sideFX support, I had HOUDINI_PATHMAP = {'Q:/': '//***.***.*.*/folder','Q:\\': '//**.***.*.**/folder'}. This additional variable fixed this issue to my "houdini nodes" but not for "octane render nodes" If somebody have any idea to fix this issue ? Best regards, Mathieu Negrel

    I’m looking for someone who can convert some OSL code to VEX code. I have a fractal formula written in OSL that needs to be volume density output VEX. For now the simple mandelbulb fractal conversion is enough but I'm looking for someone that could convert many other complex formulas.(200-300 lines of code). New to Houdini, and can't find a way to get this working...after days of looking around, this forum is my last option. OSL CODE TO CONVERT: shader OslGeometry( int Iterations = 10, float Power = 2.0, float Bailout = 20, output _sdf c = _SDFDEF) { vector pos = P; vector z = P; float dr = 1.0; float r = 0.0; for (int i = 0; i < Iterations ; i++) { r = length(z); if (r>Bailout) break; // convert to polar coordinates float theta = acos(z[2]/r); float phi = atan2(z[1],z[0]); dr = pow( r, Power-1.0)*Power*dr + 1.0; // scale and rotate the point float zr = pow( r,Power); theta = theta*Power; phi = phi*Power; // convert back to cartesian coordinates z = zr*vector(sin(theta)*cos(phi), sin(phi)*sin(theta), cos(theta)); z+=pos; } c.dist = 0.5*log(r)*r/dr; } OSL CODE THAT WORKS BUT NEED IT TO BE LIKE THE OSL: function int Mandel(float x0, y0, z0; int Iterations){ float x, y, z, xnew, ynew, znew, n=ch('n'), r, theta, phi; int i; x = x0; y = y0; z = z0; for(i=0; i < Iterations; i++){ r = sqrt(x*x + y*y + z*z); theta = atan2(sqrt(x*x + y*y) , z); phi = atan2(y,x); xnew = pow(r, n) * sin(theta*n) * cos(phi*n) + x0; ynew = pow(r, n) * sin(theta*n) * sin(phi*n) + y0; znew = pow(r, n) * cos(theta*n) + z0; if(xnew*xnew + ynew*ynew + znew*znew > 8){ return(i); } x = xnew; y = ynew; z = znew; } return(Iterations); } //--- Main --- int maxiter = 8; if(Mandel(@P.x, @P.y, @P.z, maxiter) < maxiter){ @density = 0.0; } else { @density = 1.0; } AAND MY CONVERSION THAT DOES NOT WORK function int Fractal(int Iterations, float Power, float Bailout, vector pos, vector z, float dr, float r){ for (int i = 0; i < Iterations ; i++) { r = length(z); if (r>Bailout) break; // convert to polar coordinates float theta = acos(z.z/r); float phi = atan2(z.y,z.x); dr = pow( r, Power-1.0)*Power*dr + 1.0; // scale and rotate the point float zr = pow( r,Power); theta = theta*Power; phi = phi*Power; // convert back to cartesian coordinates z = zr*vector(sin(theta)*cos(phi), sin(phi)*sin(theta), cos(theta)); z+=pos; } return 0.5*log(r)*r/dr; } int Iterations = 10; float Power = 2.0; float Bailout = 20; vector pos = @P; vector z = @P; float dr = 1.0; float r = 0.0; if(Fractal(Iterations,Power,Bailout,@P,@P,dr,r) < Iterations){ @density = 0.0; } else { @density = 1.0; } Thanks in advance. Cheers, Scappin Matteo www.machina-infinitum.com
  4. Hello, I modeled multiple tubes generated by polywire sop. Although all of the faces' normal is correctly assigned, some portion of the tubes rendered incorrectly (strange looking sss scattering, "broken" appearance, etc.) At first, I thought the problem is caused by overlapping polys because my geo has quite a complex shape. So, I tried removing overlapping polygons using Boolean sop and removing degenerated prims using clean sop. But the result didn't change. I'd like to know what should I do to render the geometry correctly. I attached the hip file. (polywire.hiplc) Thank you.
  5. Houdini fire timing is off

    I have been banging my head on my keyboard for a bit on this one. I have exported an alembic file consisting of an object that bounces up and down. I then export that object to Houdini where I perform a very basic fire simulation on the object. I then export the fire sequence out as a vdb where I import it into Cinema 4D and display the vdb with Octane render. Everything looks great the only problem is the fire object moves faster than the initial object. This should not be possible considering the fire's position is based on the position of the object. Does anybody have any suggestions on how I can fix this? *Both alembic, Cinema 4D, and Houdini files are all based on 24 frame rate
  6. Hey guys, I made a little interior scene for you to play around with. It's free . Enjoy https://gum.co/zlchF Wout
  7. I've start test Houdini 18 and Arnold 6. the first test was simple splines rendering, 250.000 splines instanced 25 times. it loads a 140MB alembic file. rendered in 6 core Xeon CPU and Nvidia Quadro RTX 5000. (windows 10 pro) the startup for Arnold GPU is slow, it renders faster, so it seems but for clear up the final image it takes for forever or just dropped /crashed, hard to tell on the GPU. the CPU is quite fast but much slower then GPU if it ever would finish. (adaptive sampling was on) As soon as Arnold finishes rendering the scene, it stops and do not refresh any more on parameter changes. so far i am not impressed with the Arnold GPU rendering. here is the same scene Arnold CPU with only direct Lighting. (on my MacBook) some test with Arnold GPU. it performed much better with just direct lighting.
  8. Hi guys, I made this simple sim in Houdini and exported it to C4D to render with Octane V4 as alembic. The problem is that in the first frames, there are those weird polygons on the mesh, maybe normal problems? I didn't manage to fix it so I'm ask if anyone here had this problem before and knows a solution for it. I will attach the render and my hip filie below. Thanks in advance. RnD_Viscous.v0.hip lan_rnd_sorvete.mov Edit: I'm sorry admin I messed up with the replies.
  9. Hello, I can't figure out how can I reference houdini attributes in the octane network material. I see there are two nodes called "Color Vertex Attribute" and "Float Vertex Attribute" but I don't know how to use them or reference the attribute I want. I can't find anything about them in the documentation either. Does anyone know how to do this?
  10. Rocket Bus - houdini training

    Hello everyone, The primary aim of this training is to provide a project that will take the viewer through as much of Houdini as possible. Letting them utilize all the various tools that Houdini provides for modeling and VFX to generate a detailed environment. Currently the training is available for redshift and octane. Next week, I'll be recording the mantra version. There is a 25% introductory discount in the entire training till 18th may 2019 Click on the link given below for more information http://www.rohandalvi.net/rocketbus
  11. UDIM in Octane

    Does anyone know how to do a proper UDIM Setup in Octane with the Texture UDIM Node?
  12. Octane Instances

    Hi everyone, I got an issue with rendering a Lot of Spheres in Octane. I scattered 1 million points on a surface and copied Spheres on it (with the CopyStamp SOP). I packed it but it does not render and crash. Can somebody tell me how i can render Instances in Octane or point out some Informations, i can't figure out how to do it right due im new to Houdini and Octane. Cheers!
  13. Hello everyone, I'm starting with Houdini and Python and I have a doubt which would influence my learning curve significantly. I'd like to know if someone has specific information about reaching the transformation matrix of particles in Houdini - preferably in Python. From the SideFx Python Documentation says it's not yet implemented. I also read somewhere here that it's possible through VOP/VEX. The objective is to make a particle export script from Houdini to Octane's CSV - to adapt Houdini to an existing workflow. This CSV file only has these particle's transform matrix. And it would have to be usable, for example, for 5 million particles. Does anyone has any tips? Or in alternative if someone has this script already, it would be great! I'm not a coder (MaxScript only) and it will take me ages to get it done... Thanks in advance! M
  14. Octane background

    Hi guys, Does anyone know how to do an HDRI render in octane with transparent or HDRI-less background? Forgive me, as I searched for this answer and could not find it anywhere... Cheers and thanks! T
  15. Terrain Building in Houdini

    Hello Everyone, This training is will cover the new height field tools introduced in Houdini 16. The training comprises of 5 projects that will cover techniques to create a variety of terrains. Over the course of the projects the videos will cover a majority of the heightfield tools such as noise, pattern, mask by feature, heightfield layer, erode, heightfield wrangle etc. The training is available for Redshift, Arnold, Octane and Mantra. For more information kindly click on the link given below http://www.rohandalvi.net/terrains
  16. Neon Dreams - Overwatch fanart

    Hi, This would technically be my first fan art in Houdini. Usually I make all of my fan arts in Daz and use Houdini to do some additional modelling since you can't model in Daz. This time I went the other way around primarily because I wanted to try the new Hair tool in Houdini 16. Which, by the way, are fantastic. The character and clothing were posed in Daz and exported as obj to Houdini. Hair and the rest of the scene is Houdini. Skin and hair shader is custom because octane doesn't have a skin or a hair shader. For my next one I'll try the new auto rigging tools on Houdini.
  17. 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!
  18. Making Dessert in Houdini - Training

    Hello Everyone, This training is an update to the Tea and Cookies training. The training covers fairly similar topics such as modeling, shading, lighting and rendering. The primary difference is that instead of Mantra the training focuses on using the third party render engines namely, Redshift, Octane and Arnold. The modeling part of the training covers a variety of techniques ranging from basic poly modeling, VDB, fluid simulations and even POP grains to build the scene. This shading and lighting part primarily focuses is on building all the various shaders required for the scene using a variety of procedural textures and bitmaps. The training will also cover SSS, displacement and building fluid shaders using absorption. We will also build relatively detailed metal and plastic shaders. Trailer for further details kindly click on the link given below http://www.rohandalvi.net/dessert/
  19. Sup guys, anybody knows how to read houdini color attributes in octane for c4d? I tried exporting as alembic, that gave me a vertex color tag wich I plug into a vertex map on a material, but isn't working, the native c4d render seems to load it, any tips on this? Thanks!
  20. Hello everyone, This training is a series of small projects that will cover the process of creating a variety of volumetric effects in Houdini and rendering them using Octane. This training is primarily focused on modeling and rendering custom volume effects. Over the course of this training I'll cover a variety of effects which include building and rendering clouds, making a pyro shader and using the blackbody emission to control the pyro shader. We'll also build custom volume effects such as a gas flame and a nebula. Finally we'll take a look at building controllable volume lights and volume fog. NOTE: Additional lessons for Redshift and Mantra will be added to this training towards the end of October. (They will be available separately for download depending upon your renderer of choice. These parts will be charged separately.) For further details click on the link given below http://www.rohandalvi.net/volumetrics
  21. Hello Everyone, A couple of renders done using Houdini and Octane. Rendered using a single GTX 1080. The render time is relatively high but I love the look. The nebula render has very little post production. The cloud render was tweaked a little in photoshop using Color Efex pro. These are part of a new training series on volumetric rendering. Nebula - Render time - 1 hr 50 min at 4K resolution Clouds - Render time 45 min for Full HD
  22. As much as I am sold on the improved performance of Octane and Redshift (assuming you have a decent gpu) I am highly doubtful they can match the 'high realism' of renders like this one by Maxwell http://www.tonifresnedo.com/maxwell-render/rendl-rossy-lamp/#/gallery_2663/2 Any experienced Redshift or Octane users care to chime in?
  23. I would post in the Otoy forum but I feel this question is more Houdini-centric. So i've setup my Octane plugin properly AFAIK and I can see the Octane shelf. There are at least 3 ways to preview 1> Click on IPR 2>Render>Preview in MPlay>Octane_ROP 3>Render>Preview in MPlay>render_PBR At the moment the IPR option only gives me a black window, nothing is rendered. Does this mean I have something configured incorrectly? And I'm confused by the MPlay preview options. How are they different from IPR?
  24. Hi My understanding is that Indie v 15.5.528 supports Octane but NOT Redshift. Is this correct? If so, anyone have an ETA for Redshift support?
  25. Houdini and octane - lessons

    Hello everyone, This is the first in a series of videos on how to use Octane in Houdini. regards Rohan Dalvi