Blur exponential Shadowmaps generating a self-shadow that can't be fixed with bias

Questions
1

Hi, I have this simple scene with spotlight pointing down and a ShadowGenerator
Every mesh casts shadows

https://www.babylonjs-playground.com/#JPVT2W#1

The shadows are being generated all over the meshes.
I can’t find a bias value that fixes the problem.
For bias=0.01, it still shows a lighter shadow, but on all surfaces.
For bias=0.1 no shadow is shown

It seems that the shadow is been generated before the surfaces

selfshadow
selfshadow.JPG736×751 15.5 KB

Any idea o what’s wrong?

2

Exponential shadow map might get really tricky to get self shadow, I would recommend to use percentage CloserFiltering: https://www.babylonjs-playground.com/#JPVT2W#2

or PCSS in this case.

In case you really want to use ESM, you can try the close ESM instead : https://www.babylonjs-playground.com/#JPVT2W#3

3

Thanks.
But they require webgl2 right?
Is there any alternative that uses webgl1 and generates soft edges?

4

yup the second playground I linked above using closeESM which was initially develop to workaround self shadowing in ESM

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