little_helpers/tikz/sketch-0.2.161/Doc/sketch/Transparency.html

   1 <html lang="en">
   2 <head>
   3 <title>Transparency - Sketch</title>
   4 <meta http-equiv="Content-Type" content="text/html">
   5 <meta name="description" content="Sketch">
   6 <meta name="generator" content="makeinfo 4.7">
   7 <link title="Top" rel="start" href="index.html#Top">
   8 <link rel="up" href="Options.html#Options" title="Options">
   9 <link rel="prev" href="TikZ_002fPGF-user_002ddefined-styles.html#TikZ_002fPGF-user_002ddefined-styles" title="TikZ/PGF user-defined styles">
  10 <link rel="next" href="Internal-options.html#Internal-options" title="Internal options">
  11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
  12 <!--
  13 Copyright (C) 2005, 2006, 2007, 2008 Eugene K. Ressler.
  14
  15 This manual is for `sketch', version 0.2 (build 161),
  16 Tuesday, September 08, 2009, a program that converts descriptions of simple
  17 three-dimensional scenes into static drawings. This version generates
  18 `PSTricks' or `PGF/TikZ' code suitable for use with the
  19 TeX document processing system.
  20
  21 `Sketch' is free software; you can redistribute it and/or modify
  22 it under the terms of the GNU General Public License as published by
  23 the Free Software Foundation; either version 3, or (at your option)
  24 any later version.
  25
  26 Sketch is distributed in the hope that it will be useful,
  27 but WITHOUT ANY WARRANTY; without even the implied warranty of
  28 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29 GNU General Public License for more details.
  30
  31 You should have received a copy of the GNU General Public License
  32 along with `sketch'; see the file COPYING.txt.  If not, see
  33 http://www.gnu.org/copyleft.-->
  34 <meta http-equiv="Content-Style-Type" content="text/css">
  35 <style type="text/css"><!--
  36   pre.display { font-family:inherit }
  37   pre.format  { font-family:inherit }
  38   pre.smalldisplay { font-family:inherit; font-size:smaller }
  39   pre.smallformat  { font-family:inherit; font-size:smaller }
  40   pre.smallexample { font-size:smaller }
  41   pre.smalllisp    { font-size:smaller }
  42   span.sc { font-variant:small-caps }
  43   span.roman { font-family: serif; font-weight: normal; }
  44 --></style>
  45 </head>
  46 <body>
  47 <div class="node">
  48 <p>
  49 <a name="Transparency"></a>Next:&nbsp;<a rel="next" accesskey="n" href="Internal-options.html#Internal-options">Internal options</a>,
  50 Previous:&nbsp;<a rel="previous" accesskey="p" href="TikZ_002fPGF-user_002ddefined-styles.html#TikZ_002fPGF-user_002ddefined-styles">TikZ/PGF user-defined styles</a>,
  51 Up:&nbsp;<a rel="up" accesskey="u" href="Options.html#Options">Options</a>
  52 <hr><br>
  53 </div>
  54
  55 <!-- node-name,  next,  previous,  up -->
  56 <h5 class="subsubsection">3.1.5.5 Transparency</h5>
  57
  58 <p><a name="index-transparency-252"></a>Both <code>PSTricks</code> and <code>TikZ/PGF</code> support polygon options that
  59 have the effect of making the polygon appear transparent.  For
  60 <code>PSTricks</code>, keyword <code>transpalpha</code> was used during initial
  61 development of transparency features, and <code>opacity</code> was adopted
  62 later. <code>Sketch</code> honors both. <code>TikZ/PGF</code> uses <code>opacity</code> only.
  63 <a name="index-transpalpha-253"></a><a name="index-opacity-254"></a><a name="index-fill-opacity-255"></a>When transparent polygons are in the foreground, objects behind them
  64 (drawn earlier) are visible with color subdued and tinted.  The hidden
  65 surface algorithm of <code>sketch</code> works well with such transparent
  66 polygons.
  67
  68    <p>Note that <tt>cull=false</tt>
  69 <a name="index-cull-256"></a>must be used for rear-facing polygons to be visible when positioned
  70 behind other transparent surfaces.
  71
  72    </body></html>
  73