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Mike Horvath <mik### [at] gmailcom> wrote:
> Can anyone recommend an HDRI starfield texture that works with POV-Ray?
> I haven't used HDRI ever before so I don't know what to look for. Thanks!
You didn't mention the context so I don't know what the starfield would be used
for, but there are some nice HDRIs at https://hdrihaven.com/hdris/ and even a
few with night skies.
If you just need something for a backdrop here's a simple noise-based texture
that might do the trick:
//------------------------------------------------------------------------------
// Stars and Nebula
//------------------------------------------------------------------------------
#declare T_StarField = texture {
pigment {
average
pigment_map {
[2
bumps
color_map {
[0 rgb 0]
[0.925 rgb 0]
[1 srgb 0.6] // white (with emission)
}
scale 1/2
]
[2
bumps
color_map {
[0 rgb 0]
[0.925 rgb 0]
[1 srgb 0.65] // white (with emission)
}
scale 1/3
]
[1.5
bumps
color_map {
[0 rgb 0]
[0.95 rgb 0]
[1 srgb <0.75,0.75,0>] // yellow
}
scale 1/4
]
[0.5
bumps
color_map {
[0 rgb 0]
[0.95 rgb 0]
[1 srgb <0.75, 0, 0>] // red
}
scale 1/8
]
[0.5
bumps
color_map {
[0 rgb 0]
[0.95 rgb 0]
[1 srgb <0, 0, 0.75>] // blue
}
scale 1/8
]
[0.5
bumps
color_map {
[0 rgb 0]
[0.925 rgb 0]
[1 srgb 0.6] // white (with emission)
}
scale 1/16
]
}
}
finish { emission 15 }
}
#declare T_Nebula = texture {
pigment {
bozo
turbulence 0.75
scale 0.125/2
color_map {
[0 rgbt 1]
[0.7 rgbt 1]
[0.8 srgbt <1, 0, 0.5, 0.75>]
[0.9 srgbt <0, 0, 2.5, 0.75>]
[1.0 srgbt <0, 2, 0, 0.75>]
}
omega 0.65
lambda 3
octaves 5
scale 10000*4
}
finish { emission 0.0035 }
}
//------------------------------------------------------------------------------
// Stars and Nebula
//------------------------------------------------------------------------------
sphere { 0, 10000
texture { T_StarField scale 10 }
texture { T_Nebula scale 1 }
texture { T_Nebula scale 1.5 rotate 45 }
rotate 180
}
Cheers,
Rob
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