Keywords: tachyon

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## Command line shading controls

Tachyon supports a number of command line parameters which affect the quality and algorithms used to render scene files. The parameters select one of several quality levels, which implement various compromises between rendering speed and quality. Along with the overall shading quality controls, several specific options provide control over individual rendering algorithms within Tachyon.

- `-lowestshade`: solid colors only
- `-lowshade`: minmalistic shading, using texture colors only
- `-mediumshade`: disables computation of shadows
- `-fullshade`: enables the highest quality rendering mode
- `-aasamples sample_count`: command line override for the number of antialiasing supersamples computed for each pixel. A value of zero disables antialiasing. If this option is not used, the number of antialiasing samples is determined by the contents of the scen file.
- `-shade_phong`: use traditional phong shading for specular highlights.
- `-shade_blinn`: use Blinn's equation for specular highlights.
- `-shade_blinn_fast`: use a fast approximation to Blinn-style specular highlights.
- `-shade_nullphong`: entirely disables computation of specular highlights by registering a no-op function pointer.
- `-trans_orig`: use original Tachyon transparency mode.
- `-trans_vmd`: a special transparency mode designed for use with VMD. The resulting color is multiplied by opacity, giving results similar to what one would see with screen-door transparency in OpenGL.

Next: Command line image format Up: Running Tachyon Previous: General command line options Contents Index