Unlit Billboard Shader (Universal RP)

Unity Engine
1

Hi. I wonder if anyone can advise me how to fix this Unlit Billboard shader for UniversalRP. Sometimes it looks correct but other times it behaves very erratic (displaced, flickers, disappears) when rotating around.

The shader is used in a material together with a Sprite Renderer on a quad. The material holds the spritesheet and the Sprite Renderer .sprite property holds a single sprite from the spritesheet.

The effect I’m after is a billboard that is always facing camera but clamped at 90 degree angles, but at this point I’m happy with a traditional billboard shader.

Screenshot from ShaderGraph: Imgur: The magic of the Internet

See the erratic behavior here:

2

Billboard shader and sprite renderer together seems a dangerous combination. Any billboard shader requires the meshes not be batched, and sprite renderers batch by default even if batching is disabled in the project. If you want to use sprites, control the rotation with a script. Otherwise you’ll need to use normal mesh renderers.

3

Ah, that would explain the behavior. I started out with using a script, and for the enemies/NPC it’s not really a problem, but the grass and foliage would mean there’s a huge number of times the script is run. The reason I tried to do it using a shader and sprite is to reduce batching - by having only one material for all billboards.

Perhaps a shader which takes a spritesheet.png as maintexture and use UV manipulation (based on exposed x,y,width,height properties) to draw parts of the spritesheet. That would (in my head) mean only one draw call for all billboards, or am I wrong?

Thanks for the reply.

4

Not any, it’s can be avoided by pretty simple hack: collapse vertices positions to a single point, then use this point as origin instead of a zero point from (object to view) transformation, and use UV coords as displace vector.

5034773--493616--2019-10-06_04-15-01.png
5034773--493616--2019-10-06_04-15-01.png1459×697 55.1 KB

But it’s seems inapplicable for sprites anyway, do a lack of way to setup uv or any other vertex attribute from api.

1 Like
5

Here’s a text that anyone can copy/paste in a Shader Graph window to get the nodes set (from @mouurusai reply):

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