Thank you for the tutorial. It works well. However I stumble upon a problem when I want to instantiate a collection of cars. On some points Blender is spawning two instances although I have the "pick instace" box checked. It doesn't matter how many cars I'm spawning, the two instances just move to a different position on the street and the problem occurs on more points. I've tried different Blender versions, different collections...also using the "Distribute Points on Faces" Node doesn't fix that nor does changing the plane to a curve. Do you maybe have a solution for that?
@@vAmmonite I've found that plugging in a cube mesh (any mesh can be used) rather than a line lets you put it in a Poisson disk Distribute points on faces which can be plugged into the set position. It eliminated the problems almost completely for the cost of having a rather empty road.
If you use integers instead of floats with the random number generation and then multiply the numbers appropriately you should be able to give the cars a minimum spacing. I think that should be a simple solution.
man, thank you so much for this tutorial! this solves a bunch of problems that i had over the years with particle systems on curves interfering with each other, the particles drifting over time and so on. not to mention the looping aspect. and this is such an elegant and efficient setup compared to all those tweaks necessary when working with particles. thx! :)
but at the end, how to make them seperate 100% so they do not intersect at all ? do i need to give some physics ? please i need this, but with no intersecting. thanks sir
Thank you for the tutorial. I have been diving into geo nodes and cars driving on curves. One thing I found was using the set curve normal node and set it to Z up. It helped with the road problem. Since this was 2 years ago you may have already discovered that. I also use the 2 align nodes to the rotation.
He did not explain how he went from the one red car to the multitude of cars at 9:25. Can someone please explain how a collection of cars can be added to the scene? I've tried everything that I know, and nothing. 🙁
Can you upload a .blend file with this project finished? Because when i follow the tutorial step by step, at the and all of the cars are upside down and rotated 90° to the X axis.
Can anyone help me out? My Point is only moving up and down the first road, and doesn't jump over to the 2nd road, unless I add a value of 1 to the Sample Curve node's "curve index". I'm not sure what I did wrong. But my Sample Curve node looks different than his, and I'm using Blender 3.4.1. PS - I think I figured it out. I had to check the "All Curves" box in the Sample Curve window.
in 3.61 the vehicles only spawn on 1 of the edges for some reason, also for more realistic roads, I'd skip the fillet curve node and just add a subdiv modifier before the geometry nodes modifier and use the "how to draw roads with curves" UV tutorial Caramel made for 3.2 to texture the road
having issues at 7:50 with my rotation, my cars arent following my path after adding align euler to vector. my path is a circle thought not a road like in the video
Nice tutorial, I used this on a project to have walking people instead of traffic, and ran into a problem, they spawn in a cluster with lots of empty gap in between.
Would there be a way to adjust the speed on curves so the inner and outer lanes move at the same speed as when they're going straight, instead of going faster/slower?
Tip: you can do calculations directly inside every input field, so you can put #frame/100 in first math node and get rid of value node and second math node.
@@dineshdiabolic5451 When you _Instance on Points_ you can select "Poisson Disk" from the dropdown menu. This will activate an option that lets you set the minimum distance value. Essentially allowing you to set an offset between instances 👍 EDIT: Let me review this video and my nodes and I'll get back to you. What I said up there is wrong 🤣 Refer to my final reply below 👇
When you use the "Distribute Points on Face" node there is a dropdown menu that has an option called "Poisson Disc". Select it and play with the distance value and you can set the minimum distance between your points, and of course whatever you choose to instance on said points 🙌🎉
@@nihrom3210 He uses a _Mesh to Points_ node around @03:00 to distribute points along his mesh line. I would rework this section so that I could either A) distribute points on face - or - B) use some vector math to manually set the minimum distance between the spawned points. But without making my own copycat tutorial, I can't really explain it all. Sorry, my comment was more of a suggestion to the creator rather than a point-blank solution. I hope this helps a bit. ✌️
My guess is that there's no "issue with Blender" when it comes to the slight misalignment between the cars and the road. I think the root of the problem is that we are taking the rotation from a curve, and the curve may have some tilt to it, but in any case it's not taken into account in the calculations. There's also no x component in the "align euler to vector" section, which i suspect is a different issue but I'm not sure what "tilt" in curves really means in Blender. :P But what i thought it might mean is: it's like when you would put skis into a circular stairway - the ski that likes on the stairs near the outer edge of the staircase is not at a very steep angle, but a ski near the inner edge of the stairs is very steeply angled. That results in non-planar quads/surfaces which a car wouldn't like very much, with its suspension system being the only way to tackle uneven grounds.
How do you copy the points? If I use Shift + D, to copy the vertices, I get a copy of the road, but the cars/points are not replicated to the second road.
I'm having the same issue. My points/cars only jump to the 2nd road if I put a value of 1 into the Sample Curve node's Curve Index. : ( PS - I think I figured it out. I had to check the "All Curves" box in the Sample Curve window ( Blender 3.4.1 ).
Great tutorial thanks! I have a question. The cars in the turn/bend (sorry not sure how to call it) seem to be swooping trough faster and then going back to their original speed. Is that some that would be easy to fix?
I often had to face this problem when using curves. The position factor is not strictly linear considering the distance from start to end. It seems to be linear by subdivision section according to their individual length. I can't see the aim of such a behavior. To my opinion, it's a pain in the ###. Is there a good functional reason ? Or is it a technical issue ? The only way so far I've found (but I'm a newbe) to limit this effect is to ensure each section of the curve has approximatively the same length (which seems not possible in this case, subdivisions being created by Fillet Curve Node).
One question: is it posible to make the cars go in straight direction, not a random distance? how? I mean, i know i can delete the random value from the sample curve, but what should i plug to it to make it constant and not random?
Good day. thanks for the lesson. But the display of the pressed buttons is sometimes not enough. You sit and watch this trick. Well, English is not my native language and I perceive it through a translator from Google or Yandex.)) And the second question. how to add a collection of cars. I have them added to one point. and it turned out to be funny on the level. But it doesn't look very good on the screen.(((
