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authorN.N. <matju@users.sourceforge.net>2008-04-28 18:10:15 +0000
committerN.N. <matju@users.sourceforge.net>2008-04-28 18:10:15 +0000
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treed413a48086819f6a2620cd27d030861d122d4f3f /externals/gridflow/doc/introduction.html
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this is an old gridflow, and there's already a svn repository at http://gridflow.ca/svn/trunk
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-<html>
-<head>
-<title>GridFlow 0.7.7 - Introduction</title>
-<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
-<link rel="stylesheet" href="gridflow.css" type="text/css">
-</head>
-
-<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
-<br>
-<table width="100%" border="0" cellspacing="5">
- <tr><td colspan="4" bgcolor="#082069">
- <img src="images/titre_gridflow.png" width="253" height="23"></td></tr>
-
- <tr><td>&nbsp;</td></tr>
- <tr><td colspan="4" bgcolor="black"><img src="images/black.png" width="1" height="2"></td></tr>
-
- <tr><td colspan="3" height="16">
- <h4>GridFlow 0.7.7 - introduction</h4>
- </td></tr>
-
- <tr>
- <td width="12%" height="4">&nbsp;</td>
- <td width="80%" height="4">&nbsp;</td>
- <td width="12%" height="4">&nbsp;</td>
- </tr>
-
- <tr>
- <td width="13%">&nbsp;</td>
- <td width="82%">
-
- <p> The philosophy that guides PureData is a simple but powerful one:
- the software must first provide the user with generic tools
- rather than imposing pre-cooked effects. In other words the user
- should have total freedom.
-
- <p> GridFlow follows that philosophy: it first defines elementary
- mathematical operations. Those can in turn be used as simple
- visual effects or be combined to produce more complex effects.
-
- <p> The strategy followed by most video plugins for PureData, jMax, and MAX/MSP, is
- to provide the user first with constructs for manipulating video
- streams at a fairly high level. The strategy put forward by GridFlow
- is different.
-
- <p> It can be said that in all those video plugins there are three layers:
- the first, the low level, is not accessible to non-programmers (and fairly
- difficult of access even to programmers); the second, mathematical, where
- one needs not to be a C++ programmer, but still requires a good
- understanding of how numbers and pixels and colours and geometry work; and
- a third level that looks more like the software an artist would like to
- use.
-
- <p> In other video plugins there is a fairly low emphasis on the second
- layer. In GridFlow that layer is very strong and opens many possibilities.
- Even though the third layer in GridFlow is not as developed as it could,
- the second layer may be used to produce third-layer object classes much
- more quickly.
-
- <p> GridFlow provides a unifying view of multimedia information. Several
- kinds of data -- raster graphics in any number of channels, coordinate
- transforms, matrices, vectors -- may all be represented by <b>Grids</b>
- (also known as multi-dimensional arrays). Grids exist in several ways: they
- are usually streamed from object to object, but they can also be stored in
- memory, stored into a file, sent through the network.
-
- <p> The new GridFlow (0.6) also provides scripting, which inserts itself
- between the first and second layer to provide additional functionality. The
- language that has been chosen is Ruby, designed by Yukihiro Matsumoto
- during the 90's. This new layer is used for portability between host
- software (PureData vs jMax), for portability between platforms (Windows/Mac
- versions do not exist but would be farther ahead if it wasn't for Ruby),
- for independency from host software (GridFlow can be tested and used
- independently of PureData/jMax), for quick extensibility (you can create
- PureData/jMax object classes directly in GridFlow's configuration file),
- and so on.
-
- <p> In short, GridFlow is a whole new world of possibilities for
- the multimedia artist and programmer.
-
- <p>- matju</p>
-</td></tr>
-
- <tr><td>&nbsp;</td></tr>
- <tr><td colspan="4" bgcolor="black"><img src="images/black.png" width="1" height="2"></td></tr>
- <tr>
- <td width="13%">&nbsp;</td>
- <td width="82%">
-
- <p> Here is an example of how things work in GridFlow. (if you want more
- information, consult the rest of this manual)
-
- <p> A picture is a three-dimensional Grid:<br>
- <b>0</b> : rows <br>
- <b>1</b> : columns <br>
- <b>2</b> : channels <br>
-
- <p>
- Pictures come in all sorts of heights and widths. The channels, however,
- are more limited in number. Usually it's three: Red, Green, Blue.
-
- <p> A coordinate transform, when specified pixel by pixel, may be a
- three-dimensional Grid in which the two "channels" are Y and X,
- representing row-and-column positions in a separate picture.
-
- <p> Other shapes of grids could be designed to represent various things;
- for example, configuration for blur effects. Grids could be useful for
- things not directly related to raster pictures (e.g. sound recordings).
- Those are all kinds of things you could actually develop <i>within</i> the
- PureData / GridFlow framework. You don't need to wait for me.
-</td>
-
- <tr><td>&nbsp;</td></tr>
- <tr><td colspan="4" bgcolor="black"><img src="images/black.png" width="1" height="2"></td></tr>
-
- <tr><td colspan="4">
- <p><font size="-1">GridFlow 0.7.7 Documentation<br>
- by Mathieu Bouchard <a href="mailto:matju@sympatico.ca">matju@sympatico.ca</a>
- and<br>
- Alexandre Castonguay <a href="mailto:acastonguay@artengine.ca">acastonguay@artengine.ca</a></font></p>
- </td>
- </tr>
-
-</table>
-</body>
-</html>