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I am trying to tick on the Sun when using an HDRI from IBL and the sun and shadow does not come on. Any tricks or bugs involved with this?

When using IBL, the sun will only be rendered if the Illumination channel is set to Active Sky (it's a Maxwell thing, not a plugin one).

JDHill wrote:When using IBL, the sun will only be rendered if the Illumination channel is set to Active Sky (it's a Maxwell thing, not a plugin one).

So is there no way of mixing both light from an HDRI and the sky at the same time?

There is no way of simultaneously illuminating the scene with an HDRI and sky (well, aside from doing something like that manually, by constructing geometry and applying an HDRI emitter material), if that is what you mean.