Houdini Tutorial - Under 10 Minutes - How to move points, objects and geometry along a curve or path
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- เผยแพร่เมื่อ 21 ก.ค. 2024
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In this fast and quick tutorial, I explain how to move points along a give curve or path and then instance objects or geometry onto the points to create cool transformations. It helps solve a variety of problems you may come in contact with, all under 10 minutes inside Houdini. - ภาพยนตร์และแอนิเมชัน
Thanks. If u want to do it just on the curve itself:
Just one wrangle.. (after the Resample SOP which gives you f@curveu)
float updated_curveu = (f@curveu+chf("o"))%1;
@P = primuv(0, 'P', 0, updated_curveu);
Never thought of using modding for looping in a specific range of values. Also the visualizer creation tip was priceless. Many thanks!
Yeah man, glad it helped!
Good to know, thanx gor taking the time to explain and demonstrate the process.
Cool ! Thanks for this tuto ! 👍
Excellent! Thank you
great content! thanks!
Great tutorials :)
great tut. helps a lot! thanks dude
Yeah man no problem! Glad it could help.
Great tutorial, thanks.
Is there a way to have the points move correctly even with uneven segment lengths? The example in this video is spaced evenly, but it doesn't work well in uneven cases
love your channel and your format of fast, short, useful techniques. keep it up!
I use a version of the technique you explained here. Instead of getting the parametric u by xyzdist() if the curve is evenly subdivided (like resampled) you can use ptnum/numpt-1 to get parametric u. In a setup with a bunch of intersecting curves, this is less error prone (as xyzdist could with a rounding error return another curve).
edit: with a bunch of curves I do the above with prim vertex numbers and primpts, but same principle applies.
Stephan Walsch thanks man, will do. Thanks for the alternate solution, always great to have several ways to do something. Very cool.
Additionally resample sop generates curveu attribute if you specify it in parameters.
excellent and thanks for sharing :)
Thanks for the video, I literally just did this whole setup in vops on my own, but I put the modulo node in the wrong spot so I thought this method didn't work. then I happened upon your video then I found out my modulo was just literally one node over in the wrong spot. Good to know I at least had the right idea and was so close to getting it working
nice! glad it was somewhat helpful.
Very useful trick!
You are legend!
Nice!
Looking throught the comments, and its seems like i am the only one but i have to ask for steps before this, or file so i can see what did you do.
searching the internet for 2 hours and i finally found thing i was looking for but need some steps before also
for example i dont know to draw simetrical true curve/line.
I wanted to draw a curve and add point to that curve traveling along and to pin surface to the curve to create some animation
why not just use a chain?
I need some help. I have a placeholder geometry for the tracks, and I wish to convert just one edgeloop to a curve.
After that, I need to scatter points like you did. So how did you do that ? Complete beginner here.
You can create curve with the technique described here th-cam.com/video/RyA7JboNTT0/w-d-xo.html
To make points even on curve you may want to use resample sop.
very useful
I'd love to see this, but with an open curve. Maybe I'm doing something wrong, but I can only get this method to work with a close curve.
bump
Couldnt this be done with some sop that simply offsets the points order (or is it vertex order?). Cant rememeber the name of the sop but thats what it does.
Probably. I'm sure there are several ways to do this. My intention with this and any of my tutorials is just to provide "a" solution, not "the" solution. That's what's great about Houdini in general. There is a lot of power in it to do the same thing multiple ways. Some more efficient than others. But yeah hopefully you find a better way to do it, that'd be awesome, and let me know!
Could the shape be saved in a dds texture format of 32 bit R11g11b10? I know it's possible somehow, just not sure how it's done. It's used in the game Farming Simulator to do just what you do, make the shape of a track, and rotate each piece correctly.
But all the info is saved in a texture image only one pixel tall, and width depending on the number of joints I presume. It's typically ranging in colors of black to blue.
All of my points are ending up in the center and not starting over. Anyone know why?
Looks Like a great tut, but I can't get my dense curve to have given normals like yours. Did you use an attribute wrangle?
I had a piece of geo in the shape of the curve, and just attribute transferred the normals from the geo onto the curve. There are probably several ways to get normals how you want on your curve, that's just how I did it for this example.
@@mrbennelson Oh okay, I understand. I just took a curve and resampled it to give it a ton of points.
@@MarvelousMediaEngine Good, glad to hear it
Does speeding up the video fractionally to artificially deflate it to under 10 minutes really count though?
perfect
hi somehow putting updated_u (float) inside the primuv vector doesnt work for me.
So i made another variable with set(updated_u, 0, 0). It only works after i did that. I wonder why it works for you but nor for me?
It could be because technically it's expecting a vector as input, but for this example it only really needs the first index of that vector. Not sure why it's not working on your end, but the fact that you got it working another way is great and what I love to see, because there is definitely more than one way to do this.
@@mrbennelson awesome :) thanks for the awesome tutorial
this was also the case for me, glad I found this comment
great tutos plz dont sptop!
I no understand, i think is one Basich Path :(
that was great, although I'm not hoping vex...
you could definitely do the same thing using vops if you're not into vex.
@@mrbennelson Yaah, I will. Although I also have to learn vex and I'm trying to because it's fast as compared to vops. But haven't found much tutorial about that, I will be great if you make some or suggest some.
@@karanmirajkar51 do you have a coding background? That helps to determine where to start.
@@mrbennelson That's my problem, I don't have much coding background but I know some basics of C++ or python
@@karanmirajkar51 vex is very similar to C++ syntax. So basic things that apply in C++ most likely apply in Vex. If I were you I'd check out "www.cgcircuit.com/tutorial/applied-houdini---particles-vi" that tutorial. It cost $50 but man that guy that teaches is one of the best you'll find when it comes to houdini. I haven't take this course from him, but since I know he's a great teacher I'm sure you'll learn the basics of what you'd need to get started in Vex, and then from there you can always google your way through problems. That's what I do when I am stuck. Also check out "www.sidefx.com/docs/houdini/vex/functions/index.html" < that's a link to all the vex functions that houdini has already predefined. So you can search those if you have something you are trying to solve.
what's wrong with your voice (upspeed?) and in 18.5 you can do this even simpler with one node
bad mic and I sped it up for ease. But I won't be doing that in the future, and I got a new mic.
Lol did you speed up to make it under 10 minutes??? great work tho!
Junzhe Shen haha yeah, but there’s something about 10 minutes that people will commit to. Sometimes tutorials can be just too long.
@@mrbennelson True! I have really learned a lot from you! And I saw you changed the name to about 10 minutes, hah. Looking forward to more of your tutorials.
@@junzheshen3343 glad to hear it!
haha is that at 1.5x speed
J So you’re right it is! Haha, I did that so people wouldn’t have to switch it on their own. Makes it easy to watch it fast and get to the point. I hate tutorials that are 2 hours long that could have been 30 mins.
@@mrbennelson yea true that, this is a great tutorial btw
@@jacksullivan8726 thanks man