Subject:
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Re: Fix for Trans - light - blue showing as trans-dark-blue in POV-RAY
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Newsgroups:
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lugnet.cad.ray, lugnet.cad
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Date:
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Tue, 28 Nov 2000 03:11:40 GMT
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Viewed:
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642 times
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Here is another sample of conversion to the "correct" color.
Here is the original (with the darker trans-blue windows):
http://members.home.net/hmltn1/ldraw/lorenz.htm
Here is one with the trans-light-blue color corrected:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=21722
In this case, I think that the "incorrect" (i.e. dark blue) original
actually looks better. The second one is definitely more indicative though
of how this would look in real life.
Brad Hamilton <bhamilto1@home.com> wrote in message
news:G4prsv.6oL@lugnet.com...
> I recently posted to lugnet.cad.ray asking for a solution to this problem.
> When you use L3p to convert .dat files to .pov, it seems to convert the
> trans-light-blue parts into trans-dark-blue.
>
> Based on the suggestions, I think I've isolated the problem and have a few
> work arounds.
>
> The problem is that the color definition for color 41 (trans-light-blue) • is
> wrong. I believe that L3p is the culprit.
>
> I used the fact that MLCAD displays the colors properly as a hint.
>
> MLCAD lists color 41 as having the following RGB values:
> R:153, G:192, B:240
> These values are out of a maximum of 255. You can get this dialog by
> clicking on 'more' in the color toolbar and clicking on that color, and • then
> "custom."
>
> POV-RAY uses values from 0-1 to represent colors. So, if I divide the • above
> values by 255, I get (roughly):
> R:.6, G:.75, B:.94
>
> In fact, L3p generated the following (incorrect) value for color 41!
> rgb <0.313726,0.313726,1>
> If you understand RGB colors, you can see that the L3P version has much • less
> intensity in the red and green channels than the (presumably correct) • MLCAD
> values.
>
> So, if I change the values in the resulting POV file, I get the same color
> match as in MLCAD!
>
> Here is a building rendered with the "normal" (incorrect) color:
> http://members.home.net/hmltn1/ldraw/office1.htm
> Here is the building rendered with the "modified" (correct?) color:
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=21719
>
> I think that the second version is far more accurate
>
> There are at least 2 ways of fixing the color:
>
> 1) In your final POV-RAY file, search for "(Color41)" and change the text
> (about 3 lines below) "rgb <0.313726,0.313726,1>" to "rgb(.6,.75,.94>"
>
> 2) Create an include file called legocolors.inc (you can use notepad to
> paste the text from below). Bram just posted this to the lugnet.ray • group.
> I've reposted it below with color41 added.
>
> To use it, you must manually insert the line:
> #include "legocolors.inc"
> in your POV-RAY file.
>
> This file also "corrects" other colors. These corrections do not fix any
> other nasty color issues, but they do modify the colors a bit to make them
> more closely match the LEGO version.
>
> As an example, here is a brickshelf page showing the above model in two
> versions.
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=2129
>
> The left one shows it with the trans-lt-blue corrected, but without any of
> the corrections in the include file. Notice how the tan is a bit too dark
> and appears a bit too orange compared to real LEGO
>
> The second one (on the right) uses the include file (actually, I just
> patched the colors manually, but the effect is the same as using the • include
> file). Notice how the tan is slightly lighter. I think the second • version
> looks more like real LEGO.
>
> I hope that helps!
>
> (P.S. Thanks to all the folks who replied to my plea for help. Each reply
> added a bit more information)
>
> //
> // Name: legocolors.inc
> // Description: Contains material declarations
> //
> // Note: These colors are based on those created by Anton Raves
> //
>
> // Pigments:
> #declare black = color rgb <0.05, 0.05, 0.05>;
> #declare _blue = color rgb <0.1, 0.3, 1>;
> #declare _blue2 = color rgb <0.1, 0.2, 0.6>;
> #declare lt_blue = color rgb <0.3, 0.7, 1>;
> #declare t_blue = color rgb <0.2, 0.6, 0.8>;
> #declare t_bluex = color rgb <0.6, 0.75, 0.94>;
> #declare brown = color rgb <0.4, 0.2, 0>;
> #declare brown2 = color rgb <0.7, 0.4, 0.2>;
> #declare chrome = color rgb <0.15, 0.15, 0.15>;
> #declare cyan = color rgb <0.5, 0.825, 1>;
> #declare t_cyan = color rgb <0.6, 0.925, 0.925>;
> #declare dark_grey = color rgb <0.1, 0.1, 0.1>;
> #declare _green = color rgb <0, 0.5, 0>;
> #declare _green2 = color rgb <0, 0.7, 0>;
> #declare t_green = color rgb <0, 1, 0>;
> #declare gold = color rgb <0.95, 0.85, 0>;
> #declare grey = color rgb <0.55, 0.55, 0.55>;
> #declare grey2 = color rgb <0.35, 0.35, 0.35>;
> #declare grey3 = color rgb <0.8, 0.8, 0.8>;
> file://#declare t_grey = color rgb <0.15, 0.15, 0.15>;
> file://#declare t_grey = color rgb <0.1, 0.1 0.095>;
> #declare t_grey = color rgb <0.45, 0.45 0.4>;
> #declare orange = color rgb <1, 0.5, 0.15>;
> #declare orange_bright = color rgb <1, 0.35, 0.15>;
> #declare _red = color rgb <1, 0, 0>;
> #declare _pink = color rgb <1,.6,.65>;
> #declare _tan = color rgb <.8,.7,.4>;
> #declare white = color rgb <1, 1, 1>;
> #declare yellow = color rgb <1, 0.8, 0>;
> #declare t_yellow = color rgb <1, 0.95, 0>;
> #declare yellowgreen = color rgb <0.6, 1, 0.15>;
> #declare t_yellowgreen = color rgb <0.9, 1, 0.45>;
>
> // Finishes:
> #if (QUAL <= 1)
> #declare lego_finish = finish { ambient 0.4 specular 1 roughness 0.005
> reflection 0 }
> #declare t_lego_finish = finish { ambient 0.6 specular 1 roughness 0.005
> reflection 0 }
> #else
> #declare lego_finish = finish { ambient 0.3 specular 1 roughness 0.005
> reflection .1 }
> #declare t_lego_finish = finish { ambient 0.6 specular 1 roughness 0.005
> reflection .1 }
> #end
>
> // Textures:
> #declare black_tex = texture { pigment { color black } finish
> { lego_finish } }
> #declare blue_tex = texture { pigment { color _blue } finish
> { lego_finish } }
> #declare blue2_tex = texture { pigment { color _blue2 } finish
> { lego_finish } }
> #declare brown_tex = texture { pigment { color brown } finish
> { lego_finish } }
> #declare cyan_tex = texture { pigment { color cyan } finish
> { lego_finish } }
> #declare green_tex = texture { pigment { color _green } finish
> { lego_finish } }
> #declare green2_tex = texture { pigment { color _green2 } finish
> lego_finish } }
> #declare grey_tex = texture { pigment { color grey } finish
> { lego_finish } }
> #declare grey2_tex = texture { pigment { color grey2 } finish
> { lego_finish } }
> #declare orange_tex = texture { pigment { color orange } finish
> lego_finish } }
> #declare red_tex = texture { pigment { color _red } finish • { lego_finish } }
> #declare pink_tex = texture { pigment { color _pink } finish
> { lego_finish } }
> #declare tan_tex = texture { pigment { color _tan } finish • { lego_finish } }
> #declare white_tex = texture { pigment { color white } finish
> { lego_finish } }
> #declare yellow_tex = texture { pigment { color yellow } finish
> lego_finish } }
> #declare yellowgreen_tex = texture { pigment { color yellowgreen } finish
> lego_finish } }
> #declare chrome_tex = texture { pigment { color chrome } finish
> lego_finish metallic reflection 0.5 brilliance 6 } }
> #if (QUAL <= 1)
> #declare t_blue_tex = texture { pigment { color t_blue filter 0 } finish
> t_lego_finish } }
> #declare t_bluex_tex = texture { pigment { color t_bluex filter 0 } • finish
> { t_lego_finish } }
> #declare t_cyan_tex = texture { pigment { color t_cyan filter 0 } finish
> t_lego_finish } }
> #declare t_green_tex = texture { pigment { color t_green filter 0 } • finish
> { t_lego_finish } }
> #declare t_orange_tex = texture { pigment { color orange filter 0 } • finish
> { t_lego_finish } }
> #declare t_red_tex = texture { pigment { color _red filter 0 } finish
> t_lego_finish } }
> #declare t_yellow_tex = texture { pigment { color t_yellow filter 0 }
> finish { t_lego_finish } }
> #declare t_yelgrn_tex = texture { pigment { color t_yellowgreen filter • 0 }
> finish { t_lego_finish } }
> #declare t_white_tex = texture { pigment { color white filter 0 } finish
> t_lego_finish } }
> #declare t_grey_tex = texture { pigment { color t_grey filter 0 } finish
> t_lego_finish } }
> #else
> #declare t_blue_tex = texture { pigment { color t_blue filter 1 } finish
> t_lego_finish } }
> #declare t_bluex_tex = texture { pigment { color t_bluex filter 1 } • finish
> { t_lego_finish } }
> #declare t_cyan_tex = texture { pigment { color t_cyan filter .9 } • finish
> { t_lego_finish } }
> #declare t_green_tex = texture { pigment { color t_green filter 1 } • finish
> { t_lego_finish } }
> #declare t_orange_tex = texture { pigment { color orange filter 0.85 }
> finish { t_lego_finish } }
> #declare t_red_tex = texture { pigment { color _red filter 1 } finish
> t_lego_finish } }
> #declare t_yellow_tex = texture { pigment { color t_yellow filter .9 }
> finish { t_lego_finish } }
> #declare t_yelgrn_tex = texture { pigment { color t_yellowgreen filter
> 0.9 } finish { t_lego_finish } }
> #declare t_white_tex = texture { pigment { color white filter .95 } • finish
> { t_lego_finish } }
> #declare t_grey_tex = texture { pigment { color t_grey filter 1 } finish
> t_lego_finish } }
> #end
>
> // Materials:
> #declare Color0 = material { texture { black_tex } }
> #declare Color1 = material { texture { blue2_tex } }
> #declare Color2 = material { texture { green_tex } }
> #declare Color4 = material { texture { red_tex } }
> #declare Color6 = material { texture { brown_tex } }
> #declare Color7 = material { texture { grey_tex } }
> #declare Color8 = material { texture { grey2_tex } }
> #declare Color9 = material { texture { blue_tex } }
> #declare Color10 = material { texture { green2_tex } }
> #declare Color12 = material { texture { orange_tex } }
> #declare Color13 = material { texture { pink_tex } }
> #declare Color14 = material { texture { yellow_tex } }
> #declare Color15 = material { texture { white_tex } }
> #declare Color33 = material { texture { t_blue_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color34 = material { texture { t_green_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color36 = material { texture { t_red_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color39 = material { texture { t_white_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color40 = material { texture { t_grey_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color41 = material { texture { t_bluex_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color42 = material { texture { t_yelgrn_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color43 = material { texture { t_cyan_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color44 = material { texture { t_orange_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color46 = material { texture { t_yellow_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color47 = material { texture { t_white_tex } #if (QUAL > 1)
> interior { ior 1.25 } #end }
> #declare Color382 = material { texture { tan_tex } }
> #declare Color462 = material { texture { orange_tex } }
> #declare Color383 = material { texture { chrome_tex } }
> #declare Color503 = material { texture { chrome_tex } }
>
> // EOF
>
>
>
>
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