Bug Particle casts full quad shadow when shader graph is used

Unity 2022.3.3 URP - My custom shader provides alpha based on texture and some calculations. As you can see it works as smoke is correctly rendered, however when "cast shadows" is enabled in the vfx graph, it renders full quads to shadow map. This happens for both lit and unlit.


On sidenote what is the correct way to enable/disable particle 'receive shadows' for unlit shaders? When shader is Lit there is checkbox in output context, but I wanted to use custom lighting and this checkbox is not there for Unlit shaders. Is it hardcoded or there is some keyword to make it work?

 

Not sure about the shadow casting issue, but to receive shadows in unlit you need to use MAIN_LIGHT enums

 

If you mean this one it's already there:


Also the funny part is that actually default Lit Quad without shader graph has no option to disable "receive shadows", but it's there if you plug Lit shader graph...
In addition for some reason some options are sometimes visible and sometimes not - as example if you unplug output from the system half of the options disappear. I am really confused.

 

I used this to receive shadows in my asset (could not read the exact entries).
If that does not work I am not sure what is happening

 

Those 3: https://github.com/Unity-Technologi...r-pipelines.universal/Shaders/Lit.shader#L137

But I bet the quad thingy is a bug, also receive shadows is bug too, most likely as I can't see anything that could hide that option.

 

Maybe a bug report gets a reply :/
Or someone else drops by with a solution

 

Ok, something is really messed up, I made new default graph today using project context menu Create Visual Effect Graph. Sorting mode is missing.
We added new Quad Output in that graph and connected exactly the same things and this is the result:

The first (B) output is the new one and it has sort mode available (and revert sorting checkbox), but "indirect draw" checkbox is missing for some reason xD
On top of that the old (A) has "Cast Shadows" option twice, in two separate sections.

 

Correct, they are not the same, one has only two queue params, while the other has like 15, but in addition the first one has this:


I attached the package with the graph and stripped version of shader [URP 2022.3.3].
To summarize, it should present following bugs:

1. Particle casts quad shadow when shader graph is used
2. Default Lit Quad without shader graph has no option to disable "receive shadows".
3. Unplugged output (from update) loses a lot of options in the inspector (might be by design)
4. Sometimes graph outputs are messed up, possibly caused by creation method - in result various options are missing, and in this specific demo: "indirect draw", "sort mode", "revert sort", or options are displayed twice like "cast shadows".
5. There is no option to enable "receive shadows" when Unlit graph is connected, what make sense for standard unlit shader, but does not allow to implement custom light (even if correct keywords are added), or at least I don't know how to do it properly.

 

No, this project is only URP, the only thing that changed is the unity version, however I am 99% sure this graph was made in current version like 1-2 days ago.

Makes sense, in this case the shadow shape might be simply caused by disabled alpha clip, but the receive shadows thingy is broken I guess. It looks like that unlit with my keywords receives shadows from other objects by default, but I want to disable this. There is keyword:

#pragma shader_feature_local _RECEIVE_SHADOWS_OFF

, I assume this is the proper way to disable shadows, when I add this exposed in the graph it actually works for simple quad with renderer and material - I can turn on and off shadows. However exactly the same shader as particle produces black particles, but on top of that it completely breaks the inspector:


The thing is I suspect that even if inspector was not broken, I would not be able to mark the keyword checkbox to disable them.

 

Should I create bug report about inspector and shadows stuff, or it is already noted?

 

Thank you! Yes, changing blending in fact fixed the inspector. In this case there is only one issue left about the "receive shadows" option. Or actually not only shadows, but probably keywords in general.

Is there way to make that work?

 

Well, it does not matter if this keyword is exposed or not.

Is there any way to make it work, or at least is there any fix for this one on horizon?

 

To not cast shadow just disable the "Allow Material Override" checkbox in shadergraph Graph Setting. This works for me.