WebGL skybox ambient lighting differs from Standalone

Hello,

we change the skybox at runtime and afterward call "DynamicGI.UpdateEnvironment()". In standalone builds, this works flawlessy. In WebGL, at first the Ambient light results darker, but a second call to UpdateEnvironment() for a pinkish hue to the Ambient lighting.
Using a "flat" ambient source gives no such problems.
We're using Unity 5.3.2 P3 but had this problem since 5.1, possibly before that.

This is the Standalone and desired result:


WebGL:


WebGL after a second UpdateEnvironment():


Any help is much appreciated.
Thanks

 

Update: changing the Ambient Source at runtime from Skybox to Flat and back, and calling UpdateEnvironment() gives inconsistent results and different "hues" (but never the correct one).

 

Sorry i should have specified, we don't use GI. We just set skybox (and ambient source and / or reflection source) at runtime. This is our Lighting settings:


I think the problem is the "Ambient Probe" (RenderSettings.ambientProbe) containing incorrect results, but i may be wrong. We thought about manually building the ambient probe but we lack the proper knowledge of spherical harmonics at the moment.

Also, we use a cubemap in Reflection source because using Skybox source seems to not work entirely (also in standalone).

Thanks again

 

Still having this problem, the SphericalHarmonicsL2 values of the ambient probe are slightly wrong (in a random way) in WebGL. Also happens in 5.4_b13.

 

We ran into this and spent half the week trying to figure it out - our solution was not to use any other ambient source than 'Color'. All the other values resulted in ... weirdness.

 

We decided we'll just save the ambient probe values offline and apply them on our own instead of calling UpdateEnvironment().

 

I believe we actually tried that, and it still misbehaved. I may be wrong there though.

 

What we do is set our environment as desired, call UpdateEnvironment (just in case) and only then set the RenderSettings.ambientProbe[i, j] floats.
I believe any subsequent call that changes the GI / ambient settings may cause the probe values to be recalculated by Unity, if the ambient source is set to skybox.