Additive + Color Over Time Particle System for URP

Hi!

Which shader should I use to support Particle System Color Over LifeTime and Additive Blending?

I'm trying to use the "Universal Render Pipeline/Particles/Unlit" Shader, but it does not work as expected and I'm getting errors on Console.

Shader error in 'Universal Render Pipeline/Particles/Unlit': redefinition of '_Cutoff' at 2/Library/PackageCache/com.unity.render-pipelines.universal@10.2.2/Shaders/Particles/ParticlesEditorPass.hlsl(8) (on d3d11)

I also try to use the Legacy Shaders, but it works partially, but it stops working out of nowhere. Both in Scene View and Game View it only shows the bounds but no particles
.



Which shader should I use? What am I doing wrong?

 

Any joy? I'm also seeing this exact issue and I cant work out why.

 

Got it! in Library\PackageCache, delete

com.unity.render-pipelines.core@10.2.2

and

com.unity.render-pipelines.universal@10.2.2

Unity will recreate them and you should be sailing again.

 

Sigh, no, I take it back. It broke again when I next restarted the editor. Help!

 

Everything is via packagemanager.

 

Everything is via packagemanager.

I fixed the problem temporarily by creating an empty scene and copying everything from the other scene to the new one.

The particles returned to work for a while. Until suddenly they stopped working again.

 

You can also quite easily create your own Shader Graphs that work with particle systems:
https://forum.unity.com/threads/shader-graph-particle-shader.987075/

 

DO I take it this will also fix the other issue that came up at the same time?

Code (CSharp):

1. Shader error [] invalid subscript 'sh' at Library/PackageCache/com.unity.render-pipelines.universal@10.2.2/Editor/ShaderGraph/Includes/Varyings.hlsl(104) (on d3d11)

 

I noticed something very strange.
I have two cameras stacked in the scene (one for 3D and one for UI). If the particle is in the 3d camera, it works perfectly, is visible, and even changes color. But if you have the particle in the UI camera, the problem occurs, and it disappears sometimes, it doesn't work, it changes the color among other things. (Culling Mask)

Perhaps this is a clue. Is it a URP CameraStacking bug or am I doing something wrong?

 

Changing the UI Camera from Orthographic to Perspective and then Back to Orthographic seems to have fixed the problem.

The problem seems related to Clipping Planes.

Changed the NEAR to -10000 and the particles don't work.
Changed the NEAR back to 0.01 which is the default and it worked again.

Now I have my particles in full color and working! =)

 

This error is recurring for me (Unity 2021.1.26, URP 11.0.0). Any fixes?

 

Sometimes it still happens to me too and it doesn't make any sense.
In some cases, I can solve it by creating a new scene, copying everything from the previous scene to the new one and then saving over the previous scene.

 

Also a problem for me in Unity 2021.1.26, URP 11.0.0
Additive looks like this

 

I somehow fixed it by disabling and enabling the layer mask in a different order....

 

Very good! The bug happens randomly and there are several solutions that solve it randomly too...

It would be interesting to have an official response from Unity about this.... but I know it's complicated, probably if someone sends a bug report with the project where the bug occurs when they open there the bug won't happen.