# glPtexViewer

- SYNOPSIS
- DESCRIPTION
- OPTIONS
- KEYBOARD CONTROLS
- SEE ALSO

### SYNOPSIS

    glPtexViewer [-f] [-yup] [-u] [-a] [-l isolation level] [-c animation loops]
        [-e environment map] [-d HDR diffuse map] [-s HDR specular map]
        [--disp displacement scale] [--bump bump scale]
        ptex color file
        ptex displacement file
        ptex occlusion file
        ptex specular file
        objfile(s)

### DESCRIPTION

`glPtexViewer` is a stand-alone application that showcases advanced HDR shading with color, displacement, occlusion and specular ptex maps. Multiple controls are available to experiment with the algorithms.

### OPTIONS

See the description of the common comand line options for the subset of common options supported here.

-e environment map
  A low dynamic range spherical environment map used as a background. Ideally, a color-normalized version of the HDR light probe.
-d HDR diffuse map
  An HDR file containing a diffuse environment map (typically they are low resolution blurry hemispherical convolutions of the environment light probe).
-s environment map
  An HDR file containing a specular environment map.
--disp displacement scale
  A scalar multiplier for the shader displacement values.
--bump displacement scale
  A scalar multiplier for the shader bump values.
ptex color file
  A ptex file containing RGB channels read as material albedo color.
ptex displacement file
  A single-channel ptex file (preferably float precision) containing the displacement values.
ptex occlusion file
  A single-channel ptex file (preferably 8 bits precision) containing a pre-computed ambient occlusion signal.
ptex specular file
  A single-channel ptex file (preferably 8 bits precision) applied to modulate the specular reflectance of the material

### KEYBOARD CONTROLS

>     q      : quit
>     esc    : hide GUI
>     x      : save screenshot
>     f      : fit frame
>     +/-    : increase / decrease tessellation rate
>     r      : reload and re-compile the shader files
>     e      : draw normals

### SEE ALSO

Other examples : glViewer, glFVarViewer, glEvalLimit, glStencilViewer, glPtexViewer, glPaintTest, glShareTopology, dxViewer, dxPtexViewer,