How do you rotate the spawn position of a particle system?

When I initialize my particle in the VFX Graph, I can freely choose the spawn position and spawn shape, but what about rotation?

Let's say I want to initialize my particles on the surface of a circle. Is there anyway to rotate the whole circle? I don't want my particles to spawn parallel to the ground level, but in specific rotational angles.

Thanks for any help in advance.

 

@VladVNeykov Oh man, I didn't even come on the forum for this but you made my day, I've been looking for this for 2 weeks now ! Thanks !

 

@VladVNeykov sorry for my late response, but thank you so much for your detailed response. It worked!

 

The thing is that you can also rotate the emitter and it will work, unless you are in world space, then you will have no choice but rotating yourself the emitter, which is a bit annoying, specially because the gizmo is then wrong (showing the false orientation). It would be great to have a rotation option (as well as offset and scaling, all non uniform) like in Shuriken.

So right now in vfxgraph, if you want world based particle emission but also want to adapt the rotation of the emitter based on its parent (let's say a exhaust pipe from a car), you can't do it (good luck trying to find the correct rotation).

 

@cAyouMontreal Yes, It would be useful to have a simple way to choose 'Simulate in worldspace' for the whole particle effect.

Shuriken has this option as a dropdown menu item in its 'Simulation Space' attribute. Are there any plans to make this feature available in VFX Graph?

I'm keen to have a worldpsace simulation so that I can take advantage of the performance of VFX Graph when my particle emitter moves and rotates its Transform in the game world.

 

Thanks to all guys. I tried to create a VFX and I used the "Position (Circle)" node, however the "Position (Circle)" node can't be rotated, so I rotated the VFX and used the Transform node to convert the position that I passed from parameters.

 

The solution above worked perfectly for my simple case (I needed a hemisphere emitter flat on the ground, the default arc slices it vertically).
I believe you can use world space rotations by exposing the Transform (Position) as a Property and setting it to match your (e.g.) exhaust pipe.
Apologies if I get this wrong, but I think that what we're doing here is directly applying the transform to every particle as it is created and before it appears in the world, which makes this technique incredibly powerful (you can do anything to your emitters).
My only criticism is that it's entirely obscure, there's no way I would have thought this might work if I hadn't found this thread.

 

Yay! I'm giving this a try. I asked in another part of the forum, but thought I'd stumble across it.

 

Does this rotation method work for point cache particles...?

Edit: Got it working.
Found the solution from a post by one of the Unity Tech moderator Vlad Neykov (@vladimirneykov).

Solution - Right after you set the position of your pcache, you can get the particle position and run it via a Transform Position node.

https://forum.unity.com/threads/feedback-wanted-visual-effect-graph.572110/page-10#post-4461559

 

Have you?

 

In some situations instead of full fledged rotation 90 deg you can just swap y<->z position components.

 

It would be cool, if the shape Gizmo for the attached GameObject would be rotated with the shape block transform then as well.

 

I have been trying to figure this out for several days now.

How do I do the same without the circle. I want to set the local rotation of the particle to x=90 while the particle system is in world space. Using angle (x=90) works as long as the system is in local space but when I switch to world space then it sets the world rotation to 90.

Is there a block like chance space for angles?

 

@VladVNeykov I have been struggling with this for days... consulting help on the official Unity VFX Discord channel and nothing we've tried was able to get my VFX to work the way I'm intending. I'm trying to make action/speed lines for my vehicle-based game... simple speed trails that whiz by you as you drive fast. You would expect these to come from a torus shape in front of the vehicle in a heads/trails system, but I cannot get the torus to rotate. If there was a way to rotate the emitter directly on the Set Position Torus node, that would be extraordinarily helpful in making VFX graph a bit more beginner friendly. I am not the only one who is struggling with this as someone else was having essentially the same issue in that Discord at the same time.

 

So there is no way to rotate the emitters when suing World Space?

 

I am also struggling with this. The fact that emitters do not rotate when the system is in world space mode is very confusing and I don't know how to work around it. Please fix this, Unity. The trick that was suggested only works for systems in local space.

 

@VladVNeykov
Welp, the year is 2022 and the Get Attribute: position + Transform does not do it for me.
Neither is there any sign of Angles in the Set Position (Shape: Circle)
Any ideas?

 

Is there a way to do this with AABox?

 

It's not. AABox (axis aligned box) by defnition is aligned to coordinate system, however I think it sounds like nice feature to add - Set position from shape: oriented box.

 

If your particles are in World Space, you can do this with the AA box by doing this. The WS Transform is fed through a property binder.


If the particles are in local space, do this: