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<div class="section" id="environment-variables">
<h1>Environment Variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">ΒΆ</a></h1>
<p>Ren'Py accepts a number of environment variables that influence its behavior.
These environment variables may disappear or change between Ren'Py releases.</p>
<p>The following environment variables control the behavior of Ren'Py:</p>
<dl class="docutils">
<dt><tt class="docutils literal"><span class="pre">RENPY_DISABLE_JOYSTICK</span></tt></dt>
<dd>If set, joystick detection is disabled. Use this if a faulty joystick is
causing Ren'Py to advance when not desired.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_DISABLE_FULLSCREEN</span></tt></dt>
<dd>If set, Ren'Py will refuse to go into fullscreen mode.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_DISABLE_SOUND</span></tt></dt>
<dd>This prevents sound playback from occuring. If this variable contains
"pss", sound playback will be disabled.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_EDIT_PY</span></tt></dt>
<dd>The path to an .edit.py file telling Ren'Py how to invoke a text editor.
See <a class="reference internal" href="editor.html#text-editor-integration"><em>Text Editor Integration</em></a> for more information.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_GL_ENVIRON</span></tt></dt>
<dd>Sets the OpenGL texture environment.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_GL_RTT</span></tt></dt>
<dd>Sets the OpenGL render-to-texture method.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_GL_VSYNC</span></tt></dt>
<dd>This determines if Ren'Py will attempt to synchronize with the display's
vertical refresh. (This prevents tearing, at the cost of potentially
lowering framerate.) Set this to "0" to disable synchronization, or
"1" to sync to every vertical refresh.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_LANGUAGE</span></tt></dt>
<dd>If set, gives the translation language Ren'Py will use.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_LESS_MEMORY</span></tt></dt>
<dd>This causes Ren'Py to reduce its memory usage, in exchange for reductions
in speed.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_LESS_UPDATES</span></tt></dt>
<dd>This causes Ren'Py to reduce the number of screen updates that occur.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_LESS_MOUSE</span></tt></dt>
<dd>This causes Ren'Py to disable the mouse at all times.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_SCREENSHOT_PATTERN</span></tt></dt>
<dd>A pattern used to create screenshot filenames. It should contain a single
%d substitution in it. For example, setting this to "screenshot%04d.jpg" will
cause Ren'Py to write out jpeg screenshots rather than the usual pngs.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_SIMPLE_EXCEPTIONS</span></tt></dt>
<dd>When set, this disables Ren'Py's graphical exception handling.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_SKIP_MAIN_MENU</span></tt></dt>
<dd>When set, skips the main menu.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_SKIP_SPLASHSCREEN</span></tt></dt>
<dd>When set, skips the splashscreen.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_SOUND_BUFSIZE</span></tt></dt>
<dd>This controls the sound buffer size. Values larger than the default (2048)
can prevent sound from skipping, at the cost of a larger delay from when a
sound is invoked to when it is played.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_TIMEWARP</span></tt></dt>
<dd>This can be set to make time run faster or slower. For example, setting
a timewarp of 0.5 makes things run at half-speed, while a timewarp of
2.0 makes everything run at twice normal speed.</dd>
<dt><tt class="docutils literal"><span class="pre">RENPY_VARIANT</span></tt></dt>
<dd>This should be set to a space-separated list of screen variants that
Ren'Py is expected to use.</dd>
</dl>
<p>As Ren'Py uses SDL, its behavior can also be controlled by the SDL environment
variables.</p>
<p>At startup, Ren'Py will look in the Ren'Py directory (the one containing
renpy.exe or renpy.py) for the file "environment.txt". If it exists, it will be
evaluated as a python file, and the values defined in that file will be used as
the default values of environment variables.</p>
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