---
name: "tachyon-nox"
section: "1"
platform: "linux"
package: "tachyon-bin-nox"
version: "0.99~b6+dsx-14"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/tachyon-nox"
---

# tachyon-nox(1)

parallel/multiprocessor ray tracer with no X support

## NAME

tachyon-nox - parallel/multiprocessor ray tracer with no X support

## SYNOPSIS

**tachyon-nox** *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