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"borix" <nomail@nomail> wrote:
> There isn't much more shadow even with error_bound 0.01. What it does is
> that it changes the pattern on the left side of the cube.
>
> The sun is near the horizon in the hdri.
To add to what Alain said: With a few 'higher quality' radiosity settings, I do
see a shadow. I think each person has his or her own set of 'favorite'
settings-- mine change on a weekly basis, ha.
My own *basic* rule-of-thumb is to use very small settings for
minimum_reuse ...
maximum_reuse ...
This creates smaller light 'patches', which more accurately get into and around
corners, etc. (But then other rad values need to be tuned as well, including a
higher count to get ride of that splotchy 'pattern' you mentioned. All of which
naturally makes for a slower render...)
I was actually surprised that I *do* see a shadow; the particular HDR image that
you used has a somewhat uniform sky color/brightness, with the
Sun below the horizon. Also, the 'dark' result on the plane is probably a
natural result of the relatively dark sky in most of that image.
----- example -----
#version 3.8; // or whatever
global_settings {
assumed_gamma 1
radiosity {
pretrace_end 0.001
count 1100
recursion_limit 1
// [I added these three...]
minimum_reuse .0032
maximum_reuse .0032*5
always_sample on // off by default. I prefer this ON
low_error_factor 0.2
brightness 1
}
}
camera {
perspective
location <10, 11, -20>
look_at <10, 4, 0>
right x*image_width/image_height
angle 67
}
sky_sphere{
pigment{
image_map{ hdr "lilienstein_4k.hdr"
map_type 1 interpolate 2}
}
}
box {
<0,0,0>, <8,8,8>
pigment {rgb <239, 204, 148>/255}
rotate 35*y
}
plane {
y, 0
pigment { rgb 1}
}
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