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Found 66 results

  1. solved. thx
  2. Hopefully this will be simple, but I'm having a hard time finding a solution. I have a simulated vellum string that's pinned to an animated point at one end, while the other end dangles freely. I want to "ignite" the string by having it disappear progressively starting at the free end (I think I already figured this out; All I have to do is animate the First U in the Carve node). However, I'd also like to have a particle emitter travel along the string at the same rate that it disappears, spitting out sparks to enhance the burning effect. How could one achieve this? In case my explanation wasn't clear enough, I drew this picture: And I included my .hip file. LitFuse.hipnc
  3. I manage to find a realistic way to position a train properly on a track. (see file attached) Wagon cannot simply be copied on an animated point on a curve as the centre is offset-ed in turns realistically. A path deformer is out of the question because of the deforming geometry This is my solution. 1) I created a 2 point line for each wagon 2) I path deformed the result 3) created a single point for each of those deformed line to copy each wagon onto, with proper vector for the wagon alignement I feel it is very complicated and i am curious for a better solution. If anyone interested to give his input. train_realistic_track.hip
  4. How to remove points from render

    I was following a tutorial from @librarian (a nice dude) but i stepped on the following problem: the points render and at sop level appear. I have everything exactly the same on my proyect as the tutorial and still they appear on sop so they end up rendering It should look like this: My proyect grilla3.hip Model solu2od.hipnc Thanks a lot
  5. Straighten Curve Segments?

    Is this possible with the current sop nodes or do i need vex for this? black is the input curve and blue should be the output. i nt to achieve the same result you have with a blast node but keeping the inbetween (orange) points
  6. Hello, I need help trying to bend a bunch of curves into a tapered like shape. The attached image will explain better:
  7. Smooth Curve Bumps

    I have some curves i want to smooth out but not everywhere. i need to keep the peak of every bump at the same height and ease in and out.
  8. Hi, I am a beginner level Houdini user and I am trying to accomplish an effect where I grow curves from source points on an object that are dynamic and respond to collisions/forces. An effect similar to this I found some really helpful things on cgwiki (here http://www.tokeru.com/cgwiki/index.php?title=HoudiniDops#Grow_trees_with_particles ) dealing with grains, but I can't figure out how to have my curves grow from my source points while remaining attached. Anyone know a way to accomplish this effect?
  9. Gradient along a curve

    Short video catering more towards beginners. Let me know what you think.
  10. Hi, I have an issue that I have not been able to figure out. I need particles/fluid to follow a curve, which I know how to do easily, but this particular curve crosses over itself a couple times so using Volume Velocity and Curve Force causes to particles to divert off by grabbing on to a later section of the curve. (ref images attached) Is there a way to restrict them to the current section they are on so that they ignore the areas where the curve crosses over itself? I have not been able to figure out a way to do it so I thought maybe the amazing Houdini brains on here might have an idea? Thank you in advance for any help/suggestions you can offer!
  11. link two points with a curve in vex

    I have a grid or any geo and I need to join two points with a rounded curve is there a way to do this in vex ? Thanks hdni_vex_curve.hipnc
  12. Smoke follow (fast) animated curve

    Hey Everyone, i'm hoping someone could help me with this problem. In a nutshell, i need to move smoke down an animated path, so that it sticks really tightly to the paths animation, but with all the dynamism a smoke sim brings to the table, i.e. nice peeling away around all the edges etc - I have a fairly fast moving alembic curve - cached out with 10 substeps. (may not be needed but there if i do) - I am using pops with curve force to fire particles down the path, so they follow the curve closely. - Then im using the particles to source density, and also adding their velocity into the sim so that it makes the smoke move along the curve. - Im using a high dissipation value so that i can tighten up the expansion so you can really get a sense of where the curve is / maintain the shape. My issues lie generally in 2 places: 1. Where the animated curve is moving the most - the smoke / velocities struggle to catch up and i end up with a hard edge. 2. Where the curve is tangentially facing inwards in relation to the curve, the velocities 'add' the other way, also creating a hard edge. To try and illustrate what im after - if i could animate a regular smoke sim down a straight path and then warp it into an animated spline shape / spline wrap effect, this would be the best way to achieve it, but im really not sure if is possible - hence this approach. I have already tried upping substeps - but it didnt make any difference. My gut feeling is that the problem lies within how i am sourcing the velocity. I will point out that i am very much in my houdini infancy, so my ability to problem solve isn't great (yet!) Has anyone worked on a similar effect before, or does anyone have any tips/tricks/tuts on how to achieve what im after? Any/All help very much appreciated! Cheers, C SmokeAlongCurve.mp4
  13. Brick wall tool works when moving the spline in x and z direction but when moved upwards the rotation of some of the bricks is rotated in a strange way. BrickWall.hipnc
  14. Hi, I'm generating curves... I want with the "Group by range" select say the first point and offset it with $F, I have this done... for all curves doing the same.. But what if I want a random, in a way that offset of selection on every curve is different, I was trying to use primnum, but seems not to work... Do I need some "For Each"? And if so, how. Please and Thanks! Bretislav DontKnow.hip
  15. hello, i have a curve in 3d space with an organic shape and i want to resample it so it becomes jagged but maintaining its features. So i was thinking i should compare the tangent value of each point with its next one and if the difference is big it means the curve is changing direction so i keep that point. If there is no big change in direction i remove points. But i have no idea how to implement this in Vop or Vex, i am new to Houdini. Any ideas?
  16. Hi all, Is it possible to create a curve or a line from an animated object? E.g if I had an animated sphere, would I be able to generate a curve from its trail or path (instead of creating the curve manually) so that the curve follows it?
  17. Change a curve basis in VEX?

    I'm dealing with curve sampling these days and one thing I would like to is to set curves' basis through vex. But seems such is not possible, if I'm seeing correctly that those prim intrinsics are not editable: I can use indeed the Basis SOP to read the current basis and then edit what I want, I guess I could even pass a detail attribute to this field with a string generated in VEX... But not the most procedural way and doesn't allow specification per primitive. Anyone else been through this? Cheers
  18. Hi, i want to convert a polygonal line (created for test by scatter and add node) into a bezier curve with the freehand method -> all points are connected but the path in between is interpolated. (like if you draw a curve with the curve sop + bezier+freehand option) Is it possible to convert it? - i tried to add it into the curve soptoo but it doesnt change anything. Thank you for help, Phil
  19. Hello, excuse my noobness, but i am looking for a way to translate a bulge along a curve path to deform a tube. I have a tube and my curve, i add a metaball, to which i add a "follow path" constraint. The metaball moves along the path as i advance the timeline. then comes the time i select the tube , then bulge using the metaball as magnet. i now have control on the bulge, but now the bulge stays static and does not follow the metaball's path anymore. How can i achieve this? For my needs, it would be even better if i could just translate the bulge on one of the curve's axis, instead of having it animated over time. Thanks for any help ! Pierre D
  20. I have a feeling this might be a dumb question, but I have been stuck on it for a few days now. Or maybe not so, as I've been looking countless treads here, but none really solved my problem. I've got a really simple setup, pop curve force guiding some rbd objects (I also tried doing it with points and copy stamping after sim to the same result). At a point in the sim the vectors start to point outwards: What I would need is for their direction to be always facing forward as they are at the start: I've had some luck with using pop torque, but still not what I need. I've attached an example file and the curve alembic. RBD_Directional_Vectors_Curve_Force.hip curve01.abc
  21. making primitive from closed curve.

    Hi, I'm Edmund and I'm beginner on Houdini. I'm trying to procedural road and block for city. Is there any way to making primitive by using closed curve or something?(attached)
  22. Hello guys, Is there a way to create to dynamically create curve point custom handles ? I know I can create a simple curve in HDA and export the curve handle to the HDA, but I can't animate the curve position and edit the curve after. The curve node doesn't take account of the transform node, so it's a bit wierd to modify the points of the curve when the result is 100 meters away. Any help would be appreciated !
  23. Create Curve Coordinates from a Line

    Hi, I wonder if it's possible to initialize a curve from a line and be able to modify the curve from the Curve node. I'll explain what I'm doing right now. Of course, it doesn't work, but I'm sure it will help you to understand what is my goal. Fist, I have a Null node called curve_setup. This node contains parameters that controls my line. So, the length of the line and the number of points on the line. Next, I have an Attribute Wrangler node. This node creates the line using the parameters in the curve_setup. At this point, I did some research on the Curve node and the documentation says that I can "use a space-separated list of coordinates in this field to specify points". Then, there's a list of different format to specify different points. There's one format that got my attention. It's the Pn format which "copy the coordinates of point number n in the input geometry". So, I said to myself : "Is there a way to copy the coordinates of all the points of my previously created line in the coordinates of my curve ?". Then I did more research. I learned that the Coordinates parameter is a string, so I have to use expression functions. That said, I learned that there is a expression function called pointlist that returns a "space-separated list of point numbers". Since this function returns something like this : "0 1 2 3 4 5 6 7 8 9", I though that I could format the string and add a "P" in front of every number in the list. Since Pn "copy the coordinates of point number n in the input geometry", It would create a curve based on the line I created earlier and since I can see those points from the Curve node, I would be able to modify those points using the Curve node handle. Now, I just need to learn how to format the string within the Coordinates parameter of the Curve node.
  24. Edit a Curve Outside an HDA

    Hello guys, I have a simple question. It is possible to initialize a curve in an HDA and give the user the possibility to edit that curve without jumping into the HDA, select the curve node and modify it ? If so, how may do this ? Thank you !
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