Jump to content

Search the Community

Showing results for tags 'gradient'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • General
    • Lounge/General chat
    • Education
    • Jobs
  • Houdini
    • General Houdini Questions
    • Effects
    • Modeling
    • Animation & Rigging
    • Lighting & Rendering
    • Compositing
    • Games
  • Coders Corner
    • HDK : Houdini Development Kit
    • Scripting
    • Shaders
  • Art and Challenges
    • Finished Work
    • Work in Progress
    • VFX Challenge
    • Effects Challenge Archive
  • Systems and Other Applications
    • Other 3d Packages
    • Operating Systems
    • Hardware
    • Pipeline
  • od|force
    • Feedback, Suggestions, Bugs

Found 9 results

  1. Hello guys, I am trying to build a shader, that in addition to what I have in the image, layers a black and white gradient in along the Y-axis. I am certain it must be very straight forward for anybody with more than a week of Houdini experience. Could anybody please point me in the right direction or outline the steps? Thanks in advance!
  2. Hey everyone! Here's a demo of some point cloud tools I created to calculate concave and convex curvature as well as gradient and curl direction, also sharpening. Forgot to mention in the demo that the curvature calculation is a great way to do differential growth by advection along normal * curve * noise * parm. Also, the curl calculation can be used to make grass patches and groom fur by orienting curves along the direction to add swirly variance. There's a lot of ways these tools can be handy, interested to see what you all come up with! Let me know if you have any questions, enjoy! curveGradientCurlSharpen_v002.hipnc
  3. Hello,I'm attempting to create the slitscan/timeshift effect. I'm creating a vector array in a for loop, each loop has an attrib from map and a wrangle that appends Cd to a vector array. It works when the attrib from map is always reading from the same file. When I change the attrib from map file read expression to anything that has to do with $F or the meta nodes iteration Houdini crashes. I have a test scene that has documentation and even nodes setup to create test frames to work with.If it is a matter of the way that multiple files cannot be read at once please let me know. If someone knows of a better way to read from multiple files at once and/or achieve this effect please let me know. I'm aware that after effects has this effect and uses gradients to determine which frame to look up color from. While that method is great, I'd like to be able to write the gradients/lookups in vex to achieve results. Any help greatly appreciated. -T concept_025_slitScan_v001.hiplc
  4. I am trying to scatter some points on a circle. But I want the points to be scattered more near the center and less towards the outer side. In the old Houdini Scatter I could do it by making my Circle Primitive type to "Polygon" and then uncheck "Divide Non- Convex Polygon" on the scatter node. However, in the new scatter node of Houdini 14 and 15, this option is not available. Here is what I am trying to achieve, this is with the old scatter node. This is what I am getting with the new scatter node. Please help.
  5. Hello, I'm new to houdini (maya user). I have some animated trails that I've turned into a mesh light. I'd like to get the trails to do two things: - emit a ramp from red to yellow - fade off at the end of the trail. I'm using the latest redshift_v2.0.52 - that has the new ramp node. And Houdini 15.5.523. I can get a ramp to work with the incandescent shader. But it would be great to use the mesh light. Thanks! Light_Trail_Mesh_v12_clean.hiplc
  6. I saw this on vimeo https://vimeo.com/124701487 really want do something like this for my painting https://vimeo.com/125311013 I'm new in houdini How can i drive particle flow with a picture Gradient and match the colour in Dop
  7. Lines in the centre of Mesh

    I'm trying to create lines in the centre of an object. So I guess the theory is that I need to calculate the density of the object and then create points at the centre of the object that can be connected with a add sop? Here's what I have so far (no VOPSOP added yet) Any ideas? MeshtoLines.hipnc
  8. How can I find for every point, which one of its 8 surrounding points (not only out of the 4 neighbours)(pic.2) has the maximum value of an attribute ? I want to create a vector at each point that points to the direction that the attribute increases(pic.1) I believe this is called Attibute Gradient. I want to achieve that in VOPS. I have made some progress but something is not right.(pic.3) I know for sure that one of my mistakes, is that when ask from pcopen the 8 closest points, one of them is the lookup point itself.. How do I exclude it? Any help or idea is more than welcome!!! Attribute Gradient 1.hipnc
  9. I am trying to access the data in a VDB sdf volume container that I use as a 3rd input in my node. I managed to install the openvdb headers and everything seems to compile just fine. All I'd like to do is basically access the distance and gradient values in the vdb sdf, given a world space position. I found this beautiful method which seems to address the gradient question... UT_Vector3 GEO_PrimVDB::getGradient ( const UT_Vector3 & pos ) const And this is the code snippet I am using: GU_Detail *sdfInput = new GU_Detail; duplicateSource(2, context,sdfInput); GU_PrimVDB myVDB(sdfInput,0); UT_Vector3 samplepos(1.0,0.0,0.0); UT_Vector3 gradient; gradient=myVDB.getGradient(samplepos); // <--- CRASH [/CODE] ... but when I try to use it , Houdini crashes (it crashes only on the line where I use getGradient method, it doesn't crash when I define *myVDB) I couldn't find the method to access the distance value by the way. I am pretty sure I am doing something terribly wrong cause of my limited c++ knowledge Can someone help me to correct the above code snippet and add the method to access the 'distance' data ?
×