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Eric <Eri### [at] u-clermont1fr> wrote:
> Hello,
>
> is it possible to have an object that we only see when it is reflected ?
> for example i have a mirror sphere and a sky_sphere with a gradient to
> create a nice reflection on the sphere, but i want to keep a black
> background. Any ideas ?
>
Well, it is quite easy when using the no_image patch currently available
in the Mac Unofficial MultiPatch.
For a windows version you will have to wait a little while when Nathan
releases his next update.
smellenbergh
//Here is a demo scene doing exactly what you ask for :-)
camera {
location <0.0, 0.0, -5.5>
angle 60
look_at <0.0, 0.0, 0.0>
}
background { rgb 0 }
sphere {
<0.0, 0.0, 0.0>, 5000
texture {
pigment {
gradient <0.0, 1.0, 0.0>
color_map {
[ 0.000 rgbft <1.0, 0.5, 1.0, 0.0, 0.0> ] //violet 1
[ 0.100 rgbft <1.0, 0.5, 1.0, 0.0, 0.0> ] //violet 2
[ 0.214 rgbft <0.5, 0.5, 1.0, 0.0, 0.0> ] //indigo
[ 0.328 rgbft <0.2, 0.2, 1.0, 0.0, 0.0> ] //blue
[ 0.442 rgbft <0.2, 1.0, 1.0, 0.0, 0.0> ] //cyan
[ 0.556 rgbft <0.2, 1.0, 0.2, 0.0, 0.0> ] //green
[ 0.670 rgbft <1.0, 1.0, 0.2, 0.0, 0.0> ] //yellow
[ 0.784 rgbft <1.0, 0.5, 0.2, 0.0, 0.0> ] //orange
[ 0.900 rgbft <1.0, 0.2, 0.2, 0.0, 0.0> ] //red1
[ 1.000 rgbft <1.0, 0.2, 0.2, 0.0, 0.0> ] //red2
}
scale <5000, 5000, 5000>
}
finish {
ambient rgb <1.0, 1.0, 1.0>
}
}
no_image //comment this to show the reflected sky
hollow
}
sphere {
<0.0, 0.0, 0.0>, 2
texture {
pigment {
rgb <1.0, 1.0, 1.0>
}
finish {
reflection rgb <1.0, 1.0, 1.0>
diffuse 0.0
}
}
}
--
e-mail:sme### [at] skynetbe
http://users.skynet.be/smellenbergh
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