Terrain self-shadow with CascadedShadowGenerator

Questions
1

Hi, I am trying to use a CascadedShadowGenerator with terrain generated from a height map but I am unable to set it up correctly so that the terrain casts shadows on its self.

I always get stripes all over the terrain. I am tweaking the bias and normalBias, but all I can achieve is various sized stripes or no shadow at all. I have tweaked the height map example with CascadedShadowGenerator. I have also replaced the default light with a directional light with a position above the terrain:

I am able to get shadows with just ShadowGenerator and useBlurExponentialShadowMap, but I would like the have cascaded shadowmaps. What is could be the problem and what is generally a good shadow setup for larger terrains with self-shadowing? Should I rather bake the lightmap? And just let other objects cast shadows on the terrain?

2

The shadowGenerator.shadowMaxZ (the default value is 10000) was too high and was causing precision issues,

you can set it to smth like shadowGenerator.shadowMaxZ = 100; to avoid stripes : )

idk how to self cast shadows w/ just a bump map tho : O

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3

though if it’s just bump map it would make it self shadow already right? that’s what bump maps are for

4

There’s a bug with the terrain material when using CSM. This PR will fix it:

Once merged, this PR will work as expected:

3 Likes
5

@Evgeni_Popov Absolutely awesome, thank you! Now it is working as expected in my case too. Small tweak to the normalBias to fix self-shadow artifacts and it is perfect!

@Heaust-ops I mean a lightmap, not a bump/normal map. These have pre-computed lighting, including shadows, GI, etc.

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