OpenSubdiv/documentation/glptexviewer.rst

..  
     Copyright 2013 Pixar
  
     Licensed under the Apache License, Version 2.0 (the "Apache License")
     with the following modification; you may not use this file except in
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     Section 6. Trademarks. is deleted and replaced with:
  
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     You may obtain a copy of the Apache License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
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     distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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glPtexViewer
------------

.. contents::
   :local:
   :backlinks: none

SYNOPSIS
========

.. parsed-literal:: 
   :class: codefhead

   **glPtexViewer** 
   [**-e** *environment map*]
   [**-d** *HDR diffuse map*]
   [**-s** *HDR specular map*]
   [**-y**]
   [**--disp** *displacement scale*]
   [**--bump** *bump scale*]
   [**-l** *isolation level*] 
   [**-c** *animation loops*] 
   [**-f**] 
   *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.

.. image:: images/barb_1.jpg
   :width: 400px
   :align: center
   :target: images/barb_1.jpg

OPTIONS
=======

**-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.

**-y**
  Swap Z-up geometry to Y-UP.

**-l** *isolation level*
  Select the desired isolation level of adaptive feature isolation. This can be 
  useful when trying to load large pieces of geometry.

**-c** *animation frequency*
  Number of repetitions of the animation loop (default=0 is infinite)

**-f**
  Launches the application in full-screen mode (if is supported by GLFW on the
  OS)

*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
  
*objfile(s)*
  A sequence of obj files used as an animation loop (the topology has to match
  the data contained in all the ptex files !)


Keyboard Controls
=================

   .. code:: c++
   
      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



.. include:: examples_see_also.rst