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2011-10-14T23:59:11Z

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Revision as of 23:59, 14 October 2011

Lola at 21:24, 14 October 2011

2011-10-14T21:24:21Z

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Background info: PC running Arch Linux up-to-date; nvidia proprietary drivers (sorry) with TwinView; most knowledge fished from http://www.ldraw.org and http://www.hassings.dk/l3/l3p.html

=DOES NOT WORK=

''ARCH December 2010''

'''l2rib''' native linux doesn't output useable files for renderman, pixie, 3delight

'''pixie''' is just a viewer, and a pale one at that

'''3delight''' installs in /opt, misses everything it needs to work

'''ldview 4 and 4.1''' crash, or fail to display model properly

'''LeoCAD''' segfaults all the time; build is with no issues, but can't indert a piece on the board.

''U10.10''

'''LeoCAD''' doesn't compile on Ubuntu 10.10 with the appropriate requirement for lbpng, zlib, libjpeg + GTK2 and OpenGL/libGL.so

=somehow OK=

''Arch December 2010''

'''ldview 3.1''' is OK after manually linking absolutely all needed libraries by hand

'''l3p''' works if and only if ''export LDRAWDIR=/home/jarch/bin/ld/ldraw'' was done beforehand (need to find a way to get this permanent)

Examples of code are:

./l3p ./models/car.dat

from the ldraw folder

=just works=

'''MLCAD''' under wine, with about any version, on any Linux machine I ever tried. Always works.

''U10.10''

'''LDView''' is ok from .deb, needs just one dep.

=Notes=

* Build aliases in .bashrc rather than putting all that stuff in /usr/bin
* Most nixes do have some povray util

The basic LDraw views can be represented by these Latitude,Longitude pairs:
Front=0,0 Right=0,-90 Left=0,90 Back=0,180 Over=90,0 Under=-90,0.
The 3D view can e.g. be 45,45 or 30,45.

Workin' like this:

[jarch@DC266 ldraw]$ rm 850.png && rm 850.pov && l3p -cg35,-15 -b1 ./models/850.ldr -sw2 && povray 850.pov -H600 -W800 -B -visual DirectColor && display 850.png

==lexicon==

'''CG(xxx),(xxx),(xxx)'''=Orientation '''-b(xx)'''=background '''ca(xxx)'''=focal lens '''-f'''=shadows, ground nocolor, sky follows -b(x) color '''-q(xxx)'''=Level of Details, quality

'''lc(xxx),(xxx),(xxx),(0,xxx),(0,xxx),(0,xxx),'''=lights position and colour in RGB

* -visual DirectColor is to avoid compositing engines to render the background transparent.

'''Background'''
* -b0 is dark grey-ish -- as is -b7 boring Light Grey and -b8 Darker Shade Of Ennui
* -b1 is the atrocious blue at the back -- -b9 is plainer Blue
* -b2 is hideous green
* -b3 being the Bastard child of them both -- as is -b11, only lighter
* -b4 is a red that would make a fireman puke
* -b5 fucking pink.
* -b6 brown. eurgh.
* -b10 freakin' Lime Yellow

'''Bloat'''
* '''-sw'''0 (try -sw45) will deform the pieces. ?WTF? ''See below :)''

'''Orientation''': sample -cg35,-15,-50
* -cg35 is vertical rotation 90 is vertical above the object
* -15 horizontal rotation -try -125
* -50 is distance to object ''must be negative value, of course''

'''Quality'''
* -q100 seems 'normal' -- try q00 for fun.

'''Lights''': -lc30,120,0,0.996,0.675,0.906
* -lc30,120,0, that I guess is same like Cam position
* 0.996,0.675,0.906 this is more fun: colour :)

==render recipes==

Indeed full 90° up, object facing 'south', all straight.
'''l3p -cg90,-00 -sw0 -b0 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor'''

Cool frontal aggression.
'''rm 850.png && rm 850.pov && l3p -cg335,-00 -sw0 -b5 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor && display 850.png'''

Delirious Cam Focale
'''l3p -cg335,-00 -b5 -ca100 ./models/850.ldr && povray 850.pov'''

Shadows, reflexions, sky, delirious camera angle and focal: its too much.
'''l3p -cg340,-225 -ca100 -f -b7 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor && display 850.png'''

Oops, 'set the level of details a bit too low I think...
'''l3p -cg45,-45 -ca10 -f -b0 -q00 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor && display 850.png'''

Adding some colour to light
'''l3p -cg00,45,-50 -lc30,120,0,0.996,0.675,0.906 -f -b7 -q4 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor && display 850.png'''

A quite passable play at colours
'''l3p -cg344,35,-5 -lg25,135,00,0.996,0.675,0.906 -lg60,270,-10,0.400,0.400,0.800 -fg -b7 -q4 ./models/850.ldr && povray 850.pov -H600 -W800 -visual DirectColor && display 850.png'''

Cool Warm/Cold light:
'''l3p -o -b7 -fg -q10 -cg30,35,-25 -lg60,0,999,0.3,0.3,1 -lg05,90,80,1,0.3,0.5 -lg05,90,80,0.5,0.15,0.25 -lg80,180,999,0.3,0.3,1 -lg80,270,999,0.3,0.3,1 ./block.ldr'''

==The L3P -h file==

L3P (Linux) v1.3 20021201 (C) 1998-2002 Lars C. Hassing lch@ccieurope.com
Usage: l3p [options] modelpath [povpath] [options]
'''-b'''[<color>] background color, default color is 0, -b gives 0.3,0.8,1
'''-c'''<color> default part color, default color is 7
'''-bu''' bumps
'''-sw'''<w> seam width, default is 0.5
'''-f'''[<type>][<y>] floor at <y>, default y is just below model
'''-cg'''<la>,<lo>[,<r>] camera globe position, default is 30,45,0
'''-cc'''<x>,<y>,<z> camera coordinates (location)
'''-cla'''<x>,<y>,<z> camera look_at coordinates
'''-ca'''<a> camera angle, default is 67.38 degrees
'''-lg'''<la>,<lo>,<r>[,<color>] lightsource globe position, default color is 15
'''-lc''<x>,<y>,<z>[,<color>] lightsource coordinates, default color is 15
'''-ld''' always use default lightsources
'''-l''' use positions and colors of light.dat files as lightsources
'''-lgeo''' use LGEO parts wherever possible
'''-p''' don't substitute any primitives in the P directory with POV equivalents
'''-q'''<n> quality level 0..3, default is 2
'''-w'''<n> set warning level 0..3, default is 0
'''-sc''' StepClock, add "#if (clock > n)" at steps
'''-enp''' exclude non-POV code generation (L3P IFNOTPOV)
'''-o''' overwrite POV file if it already exists
'''-check''' check modelpath for errors, Warning level is default 1.
modelpath may be a directory, which is checked recursively.
If no modelpath given all files in P and PARTS are checked.
'''-dist'''<d> warn about non-coplanar quads with distance greater than <d>
'''-det'''<d> warn about non-coplanar quads with determinant greater than <d>
'''-stdout''' redirect stderr to stdout, must be first argument
'''-pp''' print primitives, prints a list of the primitives having POV equivalents

<la> latitude, 90=N=-y, -90=S=+y. <lo> longitude in xz, 0=-z, 90=E=+x, -90=W=-x
<r> is radius. If not specified for camera it will be as close to model as
possible, if negative then camera will be -<r>% further away. If zero for
lightsource, the camera distance is used. You can specify many -lc/lg options.
<color> is an LDraw color (including extended colors) or <r>,<g>,<b>.
If povpath is not specified or is a directory, it will be modelfilename + .pov
See also l3p.txt and http://www.hassings.dk/l3p
(or http://www.ldraw.org/download/software/l3p)

L3P (Linux) v1.3 20021201 (C) 1998-2002 Lars C. Hassing lch@ccieurope.com

=links=

L3PAO by Jeff Boen (Onyx). L3PAdd-On is a graphical user interface for L3P.
http://l3pao.malagraphixia.com
http://www.ldraw.org/download/win/l3pao

POV-Ray. The Persistence of Vision Raytracer is a high-quality, totally free tool for
creating stunning three-dimensional graphics. It is available in official versions
for Windows 95/98/NT, DOS, the Macintosh, i86 Linux, SunOS, and Amiga.
The source code is available for those wanting to do their own ports.
http://www.povray.org

LGEO PovRay parts by Lutz Uhlmann:
http://www.el-lutzo.de/lego/lgeo.html.

Fixed LGEO parts by Lars C. Hassing:
http://www.hassings.dk/l3/lgeofix.html

LDAO by Steve Bliss:
http://home.earthlink.net/~steve.bliss/ldao/
http://www.ldraw.org/download/win/ldao

LDLite by Paul Gyugyi:
http://www.gyugyi.com/l3g0/ldlite/
http://www.ldraw.org/download/win/ldlite

LdGLite by Don Heyse. Making LDLite portable with OpenGL.
http://ldglite.sourceforge.net
http://www.ldraw.org/download/win/ldglite

MLCad by Michael Lachmann. The Windows CAD program.
http://www.lm-software.com/mlcad/
http://www.ldraw.org/download/win/mlcad

LeoCAD by Leonardo Zide. Windows/Linux CAD program.
http://www.leocad.org
http://www.ldraw.org/download/win/leocad

LDView by Travis Cobbs. Real-time 3D OpenGL viewer.
http://home.san.rr.com/tcobbs/LDView/
http://www.ldraw.org/download/win/ldview

L3Lab by Lars C. Hassing. Viewer/examiner.
http://www.hassings.dk/l3/l3lab.html
http://www.ldraw.org/download/win/l3lab

L3P by Lars C. Hassing
http://www.hassings.dk/l3/l3p.html
Download Area: http://www.hassings.dk/l3/l3p.html#download
http://www.ldraw.org/download/win/l3p
[[Category:Linux]] [[Category:NXT]]

Lego bricks - Revision history

Admin: 1 revision

Lola at 21:24, 14 October 2011