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This may be the same issue as reported by Mark Weyer a couple of days ago.
I'm using Pov-ray v3.5 for windows.
The following code produces unexpected results. I'd expect the whole of the
green light beam to be visible, while the red light would illuminate the
floor with no visible light beam. In fact each beam shows up in some places
and not in others. I've experimented with putting different objects into the
scene and come up with the following 'explanation'.
When a ray intersects surfaces in the light_group (i.e.. the ceiling), it
seems the light_source in the light_group is used to illuminate the media .
When the ray intersects a surface not in the light_group (i.e.. the floor),
the global lights are used. The expected behaviour (at least by me) would be
for the media to always be illuminated by the light_source in it's own
light_group.
#include "colors.inc"
camera
{
location<0,10,-30>
look_at<0,10,0>
}
//the floor
plane{y,0 pigment{White}}
light_source
{
<-10,25,10>
colour Red
spotlight
radius 20
tightness 25
point_at <-10,0,10>
}
light_group
{
//the ceiling and media
plane
{
y,30
pigment {White}
hollow
interior
{
media
{
scattering{1,White*0.1 extinction 0.1}
}
}
}
light_source
{
<10,25,10>
colour Green
spotlight
radius 20
tightness 25
point_at <10,0,10>
}
global_lights off
}
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