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.vs 12 |
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|
.nr PD .5v |
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|
.ds LF MGF |
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< |
.ds RF Version 1.0 |
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< |
.DA May 1995 |
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> |
.ds RF Version 1.1 |
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> |
.\" !Remember to update date on each modification! |
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> |
.DA February 1996 |
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|
.TL |
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|
The Materials and Geometry Format |
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|
.AU |
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|
"http://radsite.lbl.gov/mgf/HOME.html". |
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|
.RE |
| 45 |
|
.LP |
| 46 |
< |
The standard parser provides both immediate and a long-term |
| 46 |
> |
The standard parser provides both immediate and long-term |
| 47 |
|
benefits, since it presents a programming interface that is more |
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|
stable even than the language itself. |
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|
Unlike AutoCAD DXF and other de facto standards, a change to the |
| 283 |
|
T} |
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|
Material m 2-sided black T{ |
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|
sides, rd, td, |
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< |
ed, rs, ts |
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> |
ed, rs, ts, ir |
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|
T} T{ |
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|
f, sph, cyl, cone, |
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|
ring, torus, prism |
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|
# A 100-watt incandescent bulb (1600 lumens) modeled as a sphere |
| 1676 |
|
m |
| 1677 |
|
c |
| 1678 |
< |
cct 3000 |
| 1678 |
> |
cct 3000 |
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|
ed 87712 |
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|
v cent = |
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|
p 0 0 0 |
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|
.NH |
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|
MGF Translators |
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|
.LP |
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< |
Initially, there are five translators for MGF data, but only |
| 2506 |
< |
two of these are distributed with the MGF parser itself, |
| 2507 |
< |
.I mgfilt |
| 2505 |
> |
Initially, there are six translators for MGF data, and |
| 2506 |
> |
three of these are distributed with the MGF parser itself, |
| 2507 |
> |
.I mgfilt, |
| 2508 |
> |
.I mgf2inv |
| 2509 |
|
and |
| 2510 |
< |
.I mgf2inv. |
| 2510 |
> |
.I 3ds2mgf. |
| 2511 |
|
Two of the other translators, |
| 2512 |
|
.I mgf2rad |
| 2513 |
|
and |
| 2520 |
|
nestor.epfl.ch, or by WWW from |
| 2521 |
|
"http://radsite.lbl.gov/radiance/HOME.html" |
| 2522 |
|
.FE |
| 2523 |
< |
The fifth translator, |
| 2523 |
> |
The sixth translator, |
| 2524 |
|
.I mgf2meta, |
| 2525 |
|
converts to a 2-dimensional line plot, and is also |
| 2526 |
|
distributed with Radiance. |
| 2541 |
|
Mgf2inv converts from MGF to Inventor or VRML format. |
| 2542 |
|
Some information is lost, because these formats do not support |
| 2543 |
|
physical light sources or materials. |
| 2544 |
+ |
.LP |
| 2545 |
+ |
3ds2mgf converts from 3D Studio binary format to MGF. |
| 2546 |
+ |
Care must be taken to correct for errors in the material descriptions, |
| 2547 |
+ |
since 3D Studio is completely non-physical. |
| 2548 |
|
.ds LH Translators |
| 2549 |
|
.ds RH MGFILT |
| 2550 |
|
.bp |
| 2655 |
|
.SH |
| 2656 |
|
SEE ALSO |
| 2657 |
|
.LP |
| 2658 |
< |
mgf2rad, mgfilt, rad2mgf |
| 2658 |
> |
mgf2rad(1), mgfilt(1), 3ds2mgf(1), rad2mgf(1) |
| 2659 |
> |
.ds RH 3DS2MGF |
| 2660 |
> |
.bp |
| 2661 |
> |
.SH |
| 2662 |
> |
NAME |
| 2663 |
> |
.LP |
| 2664 |
> |
3ds2mgf - convert 3D Studio binary file to Materials and Geometry Format |
| 2665 |
> |
.SH |
| 2666 |
> |
SYNOPSIS |
| 2667 |
> |
.LP |
| 2668 |
> |
.B 3ds2mgf |
| 2669 |
> |
.B input |
| 2670 |
> |
[ |
| 2671 |
> |
.B output |
| 2672 |
> |
] |
| 2673 |
> |
[ |
| 2674 |
> |
.B -lMatlib |
| 2675 |
> |
][ |
| 2676 |
> |
.B -xObjname |
| 2677 |
> |
][ |
| 2678 |
> |
.B -sAngle |
| 2679 |
> |
][ |
| 2680 |
> |
.B -aAnimfile |
| 2681 |
> |
][ |
| 2682 |
> |
.B -fN |
| 2683 |
> |
] |
| 2684 |
> |
.SH |
| 2685 |
> |
DESCRIPTION |
| 2686 |
> |
.LP |
| 2687 |
> |
.I 3ds2mgf |
| 2688 |
> |
converts a 3D Studio binary scene description |
| 2689 |
> |
to the Materials and Geometry Format (MGF). |
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> |
If no output file name is given, the input root name |
| 2691 |
> |
will be taken as the output root, and an "mgf" extension |
| 2692 |
> |
will be added. |
| 2693 |
> |
This file will contain any light sources and materials, and an include |
| 2694 |
> |
statement for a similarly named file ending in "inc", which will contain |
| 2695 |
> |
the MGF geometry of all the translated 3DS meshes. |
| 2696 |
> |
.LP |
| 2697 |
> |
The MGF material names and properties |
| 2698 |
> |
for the surfaces will be those assigned in 3D Studio, |
| 2699 |
> |
unless they are named in one or more MGF material libraries given in a |
| 2700 |
> |
.I -l |
| 2701 |
> |
option. |
| 2702 |
> |
.LP |
| 2703 |
> |
The |
| 2704 |
> |
.I -x |
| 2705 |
> |
option may be used to exclude a named object from the output. |
| 2706 |
> |
.LP |
| 2707 |
> |
The |
| 2708 |
> |
.I -s |
| 2709 |
> |
option may be used to adjust automatic mesh smoothing such that adjacent |
| 2710 |
> |
triangle faces with less than the given angle between them (in degrees) |
| 2711 |
> |
will be smoothed. |
| 2712 |
> |
A value of zero turns smoothing off. |
| 2713 |
> |
The default value is 60 degrees. |
| 2714 |
> |
.LP |
| 2715 |
> |
The |
| 2716 |
> |
.I -a |
| 2717 |
> |
option may be used to specify a 3D Studio animation file, and together with the |
| 2718 |
> |
.I -f |
| 2719 |
> |
option, |
| 2720 |
> |
.I 3ds2mgf |
| 2721 |
> |
will generate a scene description for the specified frame. |
| 2722 |
> |
.LP |
| 2723 |
> |
Note that there are no spaces between the options and their arguments. |
| 2724 |
> |
.SH |
| 2725 |
> |
LIMITATIONS |
| 2726 |
> |
.LP |
| 2727 |
> |
Obviously, since 3D Studio has no notion of physical materials, the |
| 2728 |
> |
translation to MGF material descriptions is very ad hoc, and it will |
| 2729 |
> |
usually be necessary to edit the materials and light sources in |
| 2730 |
> |
the output file or replace materials with proper entries from a material |
| 2731 |
> |
library using the |
| 2732 |
> |
.I -l |
| 2733 |
> |
option. |
| 2734 |
> |
.LP |
| 2735 |
> |
With smoothing turned on (i.e., a non-zero value for the |
| 2736 |
> |
.I -s |
| 2737 |
> |
option), vertices in the MGF output will not be linked in a proper |
| 2738 |
> |
mesh for each object. |
| 2739 |
> |
This is due to the way the automatic smoothing code was originally |
| 2740 |
> |
written, and is too difficult to repair. |
| 2741 |
> |
If a good mesh is needed, then smoothing must be turned off. |
| 2742 |
> |
.SH |
| 2743 |
> |
EXAMPLES |
| 2744 |
> |
.LP |
| 2745 |
> |
To convert a 3D Studio robot model to MGF without smoothing. |
| 2746 |
> |
(Output will be put into "robot.mgf" and "robot.inc".) |
| 2747 |
> |
.IP |
| 2748 |
> |
3ds2mgf robot.3ds -s0 |
| 2749 |
> |
.LP |
| 2750 |
> |
To convert a DC10 jet model to MGF using a hand-created material library: |
| 2751 |
> |
.IP |
| 2752 |
> |
3ds2mgf dc10.3ds -ldc10mat.mgf |
| 2753 |
> |
.SH |
| 2754 |
> |
AUTHORS |
| 2755 |
> |
.LP |
| 2756 |
> |
Steve Anger, Jeff Bowermaster and Greg Ward |
| 2757 |
> |
.br |
| 2758 |
> |
Extended from 3ds2pov 1.8. |
| 2759 |
> |
.SH |
| 2760 |
> |
SEE ALSO |
| 2761 |
> |
.LP |
| 2762 |
> |
mgf2inv(1), mgf2meta(1), mgf2rad(1) |
| 2763 |
|
.ds RH MGF2RAD |
| 2764 |
|
.bp |
| 2765 |
|
.SH |
| 3434 |
|
#define MG_EUNK 1 /* unknown entity */ |
| 3435 |
|
#define MG_EARGC 2 /* wrong number of arguments */ |
| 3436 |
|
#define MG_ETYPE 3 /* argument type error */ |
| 3437 |
< |
#define MG_EILL 4 /* illegal argument value */ |
| 3437 |
> |
#define MG_EILL 4 /* illegal argument value */ |
| 3438 |
|
#define MG_EUNDEF 5 /* undefined reference */ |
| 3439 |
|
#define MG_ENOFILE 6 /* cannot open input file */ |
| 3440 |
|
#define MG_EINCL 7 /* error in included file */ |
| 3444 |
|
#define MG_ELINE 11 /* input line too long */ |
| 3445 |
|
#define MG_ECNTXT 12 /* unmatched context close */ |
| 3446 |
|
|
| 3447 |
< |
#define MG_NERRS 13 |
| 3447 |
> |
#define MG_NERRS 13 |
| 3448 |
|
.DE |
| 3449 |
|
If it is inappropriate to send output to standard error, the calling |
| 3450 |
|
program should use the routines listed under |
| 3867 |
|
transform has not changed, which is uniquely identified by the |
| 3868 |
|
global |
| 3869 |
|
.I xf_context->xid |
| 3870 |
< |
variable, but only if one is using the parser libraries transform |
| 3870 |
> |
variable, but only if one is using the parser library's transform |
| 3871 |
|
handler. |
| 3872 |
|
(See the |
| 3873 |
|
.I xf_handler |
| 4598 |
|
The hardest part is translating the specular power to a roughness value. |
| 4599 |
|
For this, we recommend the following approximation: |
| 4600 |
|
.IP |
| 4601 |
< |
roughness = 0.6/sqrt(specular_power) |
| 4601 |
> |
roughness = sqrt(2/specular_power) |
| 4602 |
|
.LP |
| 4603 |
|
It is not a perfect correlation, but it is about as close as one can get. |
| 4604 |
|
.NH 3 |
