[Bf-committers] Transmissivity

[Ed Halley]

On Jun 16, 2006, at 2:59 PM, Alexander Ewering wrote:
> Wasn't Blender recently using an even/odd rule instead of normals  
> to decide
> in/out for RT?

IOR isn't about whether some point is inside or outside a media.  IOR is
about comparing densities on both sides of an interface.

And just to be clear, unless I see a .blend otherwise, the original  
question
had nothing to do with transmissivity, per se, just refraction in  
general.

However, there is another element here to consider:  TIR.  Total  
internal
reflection can cause a ray that's traveling through the water to  
bounce off
the water bubble, and thus remain in the water (and thus make things  
look
denser sometimes).  Previously, this issue was not handled correctly  
by the
tracer, and if we need some artistic control over TIR, I can add it  
in the
2.43 timeframe very easily.

--
[ e d @ h a l l e y . c c ]