Shadow Catcher Script

[marklundin]

Consolidates the various Shadow Catcher implementations into a single version that can be used across editor/react/web components.

See demo and editor

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[LeXXik]

The first link is not correct me thinks.

[marklundin]

The first link is not correct me thinks.

Ah yep. Needs V2 engine. updating comment

[willeastcott]

Great that we will add a shadow catcher to the engine's esm script library. It's a little different from the Web Components copy though:

https://github.com/playcanvas/web-components/blob/main/examples/assets/scripts/shadow-catcher.mjs

How come this version doesn't require a custom layer? cc @slimbuck

[mvaligursky]

few/most of the light properties should be exposed as attributes, allowing user control. Lets say I want soft shadows.

[marklundin]

Yep valid point

[mvaligursky]

also please expose soft shadow properties now that the shadow type is exposed, see public in description here: #7258

[willeastcott]

Instead of just proxying lots of light properties, why not just stipulate that the script has to be applied to an entity with a light component? Better yet, the script could collect all lights below the entity and bake them all into the shadow catcher.

[marklundin]

Instead of just proxying lots of light properties, why not just stipulate that the script has to be applied to an entity with a light component? Better yet, the script could collect all lights below the entity and bake them all into the shadow catcher.

Yep I like this, although we have a custom shader at the moment that just picks the internal light

litArgs_opacity = mix(light0_shadowIntensity, 0.0, shadow0);
gl_FragColor.rgb = vec3(0.0);

We'd need that for each shadow and dynamically generate that shader, or could introduce some getShadow() to the lit shader which returns it