Re: [Plib-devel] directional lights

[Steve B. <sjb...@ai...>]

"Curtis L. Olson" wrote:

> Does plib provide any facilities for drawing or not drawing an object
> based on relative view angle?

Nope.  You could add it as a new ssgSelector node type I suppose.

> I'm pondering how I might impliment
> directional lights such as VASI for runways ... lights that change
> color depending on your relative angle to them.

I could get *shot* for revealing a trade secret here - so get your
brain nice and comfortable - and I'll just say two words...

   "Environment Maps"

...'nuff said?  No?  Well think harder!

VASI lights have to change colour gently BTW - they go through
a definite 'pink' phase between the red and white light colours.
A sudden 'blink' between the two colours is VERY distracting at
*just* the time when distraction would be "A Bad Thing"  :-)

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