Peter Popov wrote:
> So you are saying that an area light is identical to a point light for
> scattering media tests? I know this is the case with area lights and light
> falloff, but this media thingy is news to me. I just never had the guts to
> try media *and* area_light in the same scene. Any other cases I don't know
> about?
> 
> Peter

Well, yes and no. An area light _does_ cast soft shadows into the media (look at
the scene I've included, comment out area_light to see the difference). This is
very nice; but an area light's rays still start from one point in space (look at
the tip of the spotlight cone in my scene). I haven't tried out
media_attenuation and area_lights yet, but I guess the same problem persists.

Margus

//Start scene//

#include "colors.inc"
camera {orthographic
        location <0,4,-8>
        up y*15*.75
        right x*15
        look_at y*4}

light_source {0, 5
              spotlight radius 20 falloff 20 point_at y
              area_light x,z,3,3 adaptive 1 jitter
              }

media {scattering {1, .1}}

cylinder {<0,4,-7>,<0,4,7>,.75 pigment {Red}}

polygon {4,<-.5,0,-.5>,<-.5,0,.5>,<.5,0,.5>,<.5,0,-.5>
	pigment {White} finish {ambient 1 diffuse 0} no_shadow}

plane {y, 8 pigment {White} hollow}

Post a reply to this message