Peter Popov <pet### [at] vipbg> wrote in
news:bii78ugisrrqq0labhk54k2b2pl52cacmg@4ax.com: 

> On Mon, 4 Mar 2002 19:15:21 +0100, "JRG" <jrg### [at] hotmailcom> wrote:
> 
>>I don't think it's a good idea to have a flag which implies other
>>flags. Why should the shadowless flag imply media_interaction off? I
>>think each flag should be specific (that's why I'd personally love a
>>no_radiosity and a no_specular flag). 

> Shadowless implies not casting shadows in scattering media. It should
> not imply media_interraction off. If it does, it sounds like a bug.

As far as the Megapov lighting code is concerned, shadowless doesn't set 
media_interaction=off per say but has pretty much the same effect due to 
the way media illumination is calculated.

At first glance, most of the fix is to modify test_shadow() in lighting.c 
such that shadow tests are performed with shadowless lights (remove 
(Light->Projected_Through_Object != NULL) from the shadow test conditional) 
and then to adapt block_point_light() et el so that when handling 
shadowless lights, filter_shadow_ray() is only called when the shadowed 
object contains a media.  Unless I've overlooked something major, both of 
these tasks should be relatively straight forward.

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