Subject:
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Re: HDRI and radiosity
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Newsgroups:
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lugnet.cad.ray
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Date:
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Thu, 25 Mar 2004 13:03:13 GMT
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Viewed:
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1883 times
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In lugnet.cad.ray, Sven Reger wrote:
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Hi again,
I’m still working on a good way to use hdri with MLCad pictures. And I found
out that grey is a “bad” color. Pictures with grey models are always too
dark. I can only fix this if I place additional light sources. I don’t know
the reason yet but I think it has something to do with the color palette that
is normally used in PovRay. I have replaced the colors with those that are
used in the radiosity includes from digitalbricks.nl. And surprise...lights
without any light source. But - no light without shadow. Normal grey now
looks like chrome. Using other colors than grey in my model gives me the
brilliance I want. Here are some examples for the things I found out yet:
LDRAW / LGEO colors, no lightsource:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=697513
LDRAW / LGEO colors, 1 additional lightsource:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=701062
colors from radiosity.inc (digitalbricks), no lightsource:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=699814
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=699864
I’m still looking for a better way to render the train without using
additional lights. But if I use the modified colors there are too many
reflections and I found no parameter yet to reduce this to a more real stile.
Anyone here who can help?
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Sven,
The easiest way is to reduce the reflectivity of the colors. I have a file
around here somewhere that Orion once sent me with lowered reflection (Jeroen’s
colors, for the digitalbricks radiosity). However, if you’re looking to use only
the HDRI and no radiosity, that won’t help you.
If the problem is that you think the train is too dark, try turning up the
ambience on either it or the floor or the HDRI.
I really like that parrot render, by the way. If you could set the HDRI map to
white and make everything else in the picture white, I would think it was a
photo. Really good work!
-Mike
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Message has 2 Replies:
 | | Re: HDRI and radiosity
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| (...) Hi Mike, thank you for your quick answer. Can you send me the modified color-file? Or can you tell me a link for download? Would be great... I set ambience in the critical pictures to a higher level without any good result. Only if I use (...) (20 years ago, 25-Mar-04, to lugnet.cad.ray, FTX)
| | | Re: HDRI and radiosity (part 2)
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| Hi Sven, You are absolutly right about the colour light grey. For some reason light grey has a bigger highlight than other colour. See for example (URL) the colours (in this instance red, light grey and dark grey) have the same finish. This means (...) (20 years ago, 3-Apr-04, to lugnet.cad.ray)
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Message is in Reply To:
| | HDRI and radiosity
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| Hi again, I'm still working on a good way to use hdri with MLCad pictures. And I found out that grey is a "bad" color. Pictures with grey models are always too dark. I can only fix this if I place additional light sources. I don't know the reason (...) (20 years ago, 25-Mar-04, to lugnet.cad.ray, FTX)
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