Jump to content


  • Content count

  • Donations

    10.00 CAD 
  • Joined

  • Last visited

  • Days Won


acey195 last won the day on January 10

acey195 had the most liked content!

Community Reputation

178 Excellent

1 Follower

About acey195

  • Rank
    Houdini Master
  • Birthday 01/10/1991

Contact Methods

  • Website URL

Personal Information

  • Name
  • Location

Recent Profile Visitors

8,088 profile views
  1. What's the problem with n-gons?

    Generally speaking completely flat N-gons are fine (as long as you keep them in houdini for logic manipulation :P) if they get very concave they might get rendering issues though as it will do internal triangulation for the rendering, that in some rare cases will create self-intersecting geometry (only on the render side) So for render performance keeping your geometry as n-gons does not really help.. HOwever, in terms of RAM in your Houdini session it can save a lot of data.
  2. python date

    You probably want to store the time in a previous node, that does not "recook" between your outputs you can use a detail (global) variable for that, if you need code reference for that, look for: hou.node and hou.geometry in the documentation then you can reference this stored value in your rop nodes, that should not change, unless you change the input, above the node that stores the time.
  3. Why is bool type not available in VEX?

    would actually not be opposed to that idea..
  4. Why is bool type not available in VEX?

    It would add a new data type to take into account for the compiler and memory management. Generally speaking, having if checks in shader like languages is not extremely efficient anyway, so optimizing for them might also not really matter that much. I for one looove the fact that you can just add/multiply bools (ints) together, where with most other languages you cannot. I'm happy to pay a tiny bit extra RAM for that. If you have a lot of && checks, you can just multiply them all together, and if one of them was 0, the result is 0, whereas if you have a lot of || checks, you can also just add them all together and check if the sum of that, is larger than 0 and you can still use bitwise operators on ints to cover all the functionality bools have like: |= &= ^
  5. what's the Geometry traversal's application in houdini?

    why not you could do something like (creating a prim attribute from points data): //run this over primitives, to calculate the perimeter using the point data. //note that this is not the most efficient way to do this, but as an example to what options this gives you: int pts[] = primpoints(0, @primnum); float sumOfTheDistances = 0; for(int i=0; i < (@numvtx-1); i++){ vector pos0 = point(0, "P", pts[i]); vector pos1 = point(0, "P", pts[i+1]); sumOfTheDistances += distance(pos0, pos1); } f@perimeter = sumOfTheDistances; // create a primitive attribute or the other way (creating a vertex attribute while processing prims): //run this over primitives to calculate the same thing a polyframe would, but as a vertex attribute, so you do not have to make the points unique: int verts[] = primvertices(0, @primnum); vector forwardDir; for(i = 0; i < (@numvtx-1); i++){ vector pos0 = point(0, "P", vertexpoint(0, verts[i])); //get the point data, from the vertex (just to demo the conversion, vector pos1 = point(0, "P", vertexpoint(0, verts[i])); //the "P" data should also be fetchable here using vertex() instead of point() forwardDir = normalize(pos1 - pos0); setvertexattrib(0, "N", verts[i], -1, forwardDir); } setvertexattrib(0, "N", verts[-1], -1, forwardDir); //put the same data on the last vertex, as the second to last one note that I have coded this "blind" (did not test it) so hopefully the code runs, but there could be a typo somewhere
  6. what's the Geometry traversal's application in houdini?

    Hey, you mean this? : https://www.sidefx.com/docs/houdini/vex/geometry.html it allows you to run your vex code over for example primitives, while retrieving(or changing) data on points or vertices among other things
  7. Average Normal

    Your code does look ok, but it does rely on the N attribute to exist on primitives already (usually they are on points or vertices) so you could also do either vector avgN = 0; for (int i=0; i < npoints(0) ; i++) { avgN = avgN + vector(point(0, "N", i)); } avgN = avgN / npoints(0); or directly fetch the primitive normal with the native function for that: vector avgN = 0; for (int i=0; i < nprimitives(0) ; i++) { avgN = avgN + prim_normal(0, i, {0.5, 0.5, 0.5}); } avgN = avgN / nprimitives(0); but like underscoreus said, the easiest way is probably to use an attributepromote SOP (combined with a facet SOP to generate the N attribute for your points)
  8. (just in case it helps anyone else) Not completely sure, but I think the problem you were having, were the extra spaces in your while condition without brackets, sometimes it does "connect" the operators in unexpected ways. so while(radius < max && count < 20){ might behave differently than: while((radius < max) && (count < 20)){ or while(radius<max && count<20){ (last 2 should behave the same)
  9. I don't think this possible for many people to actually say, since its probably going to be somewhat confidential, but I wouldn't be surprised if its a wide range of versions for larger companies. It would make sense to start with the latest version for a production, especially longer ones. But for ongoing projects, or short projects that rely on things that were created before (on older versions) it make sense to just keep working with what you have.
  10. Maaaybe, I'm not an expert on this topic.. its just what I've heard from colleagues and friends. Perhaps using an intermediary thing, like a webclient would be a work-around for blender. You sacrifice some of the direct access, but you could still make some basic UI to send data (meshes) back and forth https://www.sidefx.com/docs/houdini/hom/hou/webServer/index.html
  11. As a matter of fact, from what I've heard, its actually "legally" tricky to embedd it into open source software.. I believe it would be against Blender's licence agreement if I remember correctly.. but yeah SideEffects made a Houdini engine SDK and documentation for a reason so as long as you are not subverting the licensing system of the plugin, I think you should be fine (This would mean your users would need to get your software as well as a Houdini Engine Licence) and yeah talking about it with SideFX would not be a bad idea either. I think they're always interested in hearing about stuff like this
  12. Switches and loops

    Depending on what you are doing in the loop. if the logic is going to be "compilable", You can also look into the "Invoke" SOP that is a way of reusing a part of network, with a different input (generating a different output) but it only works together with a compiled block as a reference.
  13. Intersect All VEX only works sometimes?

    I think you just need to change the following : float tol = -1; float ttol = -1; then it should find all intersections, even the triangles are at exactly the same height
  14. Random link of interest

    Cool(hot) real-life lava reference
  15. How to practice and get good at Vex?

    I always have the documentation open on my second screen: https://www.sidefx.com/docs/houdini/vex/functions/index.html just to use ctrl+f to find a function related to the task I'm trying to do It also really depends if you are just new to VEX, or scripting in general, in case of the latter (and even in case of the first) we can always recommend looking at Tokeru's guide: https://www.tokeru.com/cgwiki/index.php?title=JoyOfVex