Watch out for total internal reflection.  If the angle of incidence is
too shallow (the threshold angle is dependent on IOR), it will be reflected
instead of refracted.

-Nathan

Mick Hazelgrove wrote:
> 
> Hi everybody
> 
> As some of you will know I have been attempting to model rough water.
> 
> I could not understand why I had no control of the textures until I tried
> adding some transparent cones for the spray - they showed...I eventually
> traced the problem to ior, turn the ior off in the water HF and the cones
> became transparent.
> 
> The same applies to stacked hf, the ior in the water makes some of the
> higher hfs (I think the parts above the water surface)visible.
> 
> Unfortunately turning off the ior changes the waves considerably
> 
> Is this a variant of the double illumination bug? is there a fix?
> 
> I can partially fix it by placing other completely transparent Hf in the
> stack but this only partially solves the prob and I hav'nt been able to work
> out the mechanics of it, let alone understand or control it.
> 
> any ideas?
> 
> Mick

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