Subject:
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Re: Need help with errors and how to make renders look like this?
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Newsgroups:
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lugnet.cad.ray
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Date:
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Mon, 2 Jan 2006 06:51:27 GMT
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Viewed:
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8600 times
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> I've been working on and off on a tutorial on how to render LDraw files
> with radiosity and HDRI for a whole while now, but real life keeps in
> intruding... I promise I'll try to finish it and get it (and all my
> include
> files) online before the end of the year!
>
> BTW, I've done a quick test render of the Enzo. You can find it at
> http://www.brickshelf.com/gallery/Koyan/Temp/Misc/8652.png
>
> Cheers,
> Koyan
Hi Koyan, I have made an attempt to try HDRI lighting and I am not sure if I
am doing things correctly or not. Could you look over what I am doing and
let me know if I am doing anything wrong? Here is what I have done so far:
(1) Installed POV-Ray 3.6
(2) Downloaded Mega-POV 1.2.1. I then extracted it over my POV-Ray 3.6
installation.
(3) Run mpengine.exe from the POV bin folder.
(4) Made sure my .pov file had the following at the top:
#version unofficial MegaPOV 1.21; // version number may be different
(5) After the #declare DIF = 1.0; statement I did menu option
INSERT->SPECIAL EFFECTS->RADIOSITY which inserted the following code:
// radiosity (global illumination) settings
global_settings {
radiosity {
pretrace_start 0.08 // start pretrace at this size
pretrace_end 0.04 // end pretrace at this size
count 35 // higher -> higher quality (1..1600) [35]
nearest_count 5 // higher -> higher quality (1..10) [5]
error_bound 1.8 // higher -> smoother, less accurate [1.8]
recursion_limit 3 // how much interreflections are
calculated (1..5+) [3]
low_error_factor .5 // reduce error_bound during last pretrace
step
gray_threshold 0.0 // increase for weakening colors (0..1)
[0]
minimum_reuse 0.015 // reuse of old radiosity samples [0.015]
brightness 1 // brightness of radiosity effects (0..1)
[1]
adc_bailout 0.01/2
//normal on // take surface normals into account [off]
//media on // take media into account [off]
//save_file "file_name" // save radiosity data
//load_file "file_name" // load saved radiosity data
//always_sample off // turn sampling in final trace off [on]
//max_sample 1.0 // maximum brightness of samples
}
}
(6) I then replaced my lights statement with the following HDRI sphere:
// Create an infinite sphere around scene and allow any pigment on it
sky_sphere {
pigment { image_map { hdr "stpeters_probe.hdr" once interpolate 2
map_type 7 } }
}
I am not super happy with the lighting results. I know it is partly
dependent on the HDRI image used but I am not sure if my poor results are
due to not a great HDRI image, poor radiosity settings (I am using the
default settings inserted), or a combination of both. My images render very
quickly (about 45 seconds) at 640x480 AA 0.3 so I am sure I am doing
something wrong. Most good looking images take a long time to render.
Would it be possible for you to provide a sample .pov file (with associated
include files if you have any) along with a sample HDRI image? I am sure I
could learn a lot by just looking at your settings and the HDRI image you
used.
Best Regards,
John
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