180 lines
7.7 KiB
HTML
180 lines
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HTML
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>perspective()</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><img src="../perspective_.gif" alt="example pic" /><pre class="margin">// Re-creates the default perspective
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size(100, 100, P3D);
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noFill();
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float fov = PI/3.0;
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float cameraZ = (height/2.0) / tan(fov/2.0);
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perspective(fov, float(width)/float(height),
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cameraZ/10.0, cameraZ*10.0);
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translate(50, 50, 0);
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rotateX(-PI/6);
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rotateY(PI/3);
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box(45);</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Sets a perspective projection applying foreshortening, making distant objects appear smaller than closer ones.
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The parameters define a viewing volume with the shape of truncated pyramid. Objects near to the front of the volume appear their actual size,
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while farther objects appear smaller. This projection simulates the perspective of the world more accurately than orthographic projection.
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The version of perspective without parameters sets the default perspective and the version with four parameters allows the programmer to set the area precisely.
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The default values are: perspective(PI/3.0, width/height, cameraZ/10.0, cameraZ*10.0) where cameraZ is ((height/2.0) / tan(PI*60.0/360.0));.</p></td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre>perspective()</pre>
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<pre>perspective(<kbd>fov</kbd>, <kbd>aspect</kbd>, <kbd>zNear</kbd>,<kbd>zFar</kbd>)</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td><table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">fov</th>
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<td>float: field-of-view angle (in radians) for vertical direction</td>
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</tr>
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<tr class="">
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<th scope="row">aspect</th>
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<td>float: ratio of width to height</td>
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</tr>
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<tr class="">
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<th scope="row">zNear</th>
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<td>float: z-position of nearest clipping plane</td>
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</tr>
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<tr class="">
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<th scope="row">zFar</th>
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<td>float: z-position of nearest farthest plane</td>
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</tr>
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</table></td>
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</tr>
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</tr>
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<tr class="">
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<th scope="row">Returns</th>
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<td>None</td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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