SYNOPSIS

tachyon-ogl ,modelfile /[,options/]

DESCRIPTION

Valid options and accepted formats are as follows (** denotes default behaviour).

Model file formats supported:

filename.dat

the model files originated with this package

filaname.ac

AC3D model files

filename.nff

the NFF scene format used by Eric Haines' SPD

Message Options:

+V

verbose messages on

-V

verbose messages off **

Speed Tuning Options:

-raydepth xxx

maximum ray recursion depth

-numthreads xxx

(** default is auto-determined)

-nobounding

-boundthresh xxx

(** default threshold is 16)

Shading Options:

-fullshade

best quality rendering (and slowest) **

-mediumshade

good quality rendering, but no shadows

-lowshade

low quality rendering, preview (and fast)

-lowestshade

worst quality rendering, preview (and fastest)

Lighting Options:

-rescale_lights xxx rescale light intensity values by

specified factor (performed before other lighting overrides take effect)

-auto_skylight xxx

force use of ambient occlusion lighting, auto-rescaling direct light sources to compensate for ambient occlusion factor (use value 0.7 as a good starting point)

-add_skylight xxx

force use of ambient occlusion lighting, manually-rescaling direct light sources to compensate for ambient occlusion factor

-skylight_samples xxx number of sample rays to shoot

Specular Highlight Shading Options:

-shade_phong

Phong specular highlights

-shade_blinn

Blinn's specular highlights **

-shade_blinn_fast

fast approximation to Blinn's highlights

-shade_nullphong

disable specular highlights

Transparency Shading Options:

-trans_max_surfaces xxx

limit the number of transparent surfaces shown to the number specified

-trans_orig

original implementation **

-trans_raster3d

Raster3D angle-based opacity modulation

-trans_vmd

opacity post-multiply used by VMD

Transparent Surface Shadowing Options:

-shadow_filter_on

transparent objects cast shadows **

-shadow_filter_off

transparent objects do not cast shadows

Fog Shading Options:

-fog_radial

radial fog implementation **

-fog_vmd

planar OpenGL-like fog used by VMD

Surface Normal/Winding Order Fixup Mode:

-normalfixup [off|flip|guess] (** off is default)

Antialiasing Options:

-aasamples xxx

maximum supersamples taken per pixel (** default is 0, or scene file determined)

Output Options:

-res Xres Yres

override scene-defined output image size

-o outfile.tga

set output file name

-clamp

clamp pixel values to [0 to 1) **

-normalize

normalize pixel values to [0 to 1)

-gamma val

normalize apply gamma correction

-format BMP

24-bit Windows BMP (uncompressed)

-format JPEG

24-bit JPEG (compressed, but lossy)

-format PNG

24-bit PNG (compressed, lossless)

-format PPM

24-bit PPM (uncompressed)

-format PPM48

48-bit PPM (uncompressed)

-format PSD48

48-bit PSD (uncompressed)

-format RGB

24-bit SGI RGB (uncompressed)

-format TARGA

24-bit Targa (uncompressed) **

Animation Related Options:

-camfile filename.cam

animate using file of camera positions

-nosave

disable writing of output frames to disk (only used for doing real-time rendering)

Interactive Spaceball/SpaceNavigator Control:

-spaceball

enable Spaceball/SpaceNavigator camera flight

-spaceballport serialportdevicename (only for serial devices)

Getting Help:

-help

display help message and exit

-version

display version string and exit

-banner

display banner and exit