196 lines
8.2 KiB
Groff
196 lines
8.2 KiB
Groff
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<title>directionalLight() | reference | Processing.js</title>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>directionalLight()</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="directionalLight_.jpg" alt="example pic" /><pre class="margin">size(100, 100, P3D);
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background(0);
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noStroke();
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directionalLight(51, 102, 126, -1, 0, 0);
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translate(20, 50, 0);
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sphere(30);</pre></div><div class="example"><img src="directionalLight_2.jpg" alt="example pic" /><pre class="margin">size(100, 100, P3D);
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background(0);
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noStroke();
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directionalLight(51, 102, 126, -1, 0, 0);
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translate(20, 50, 0);
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sphere(30);</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>Adds a directional light. Directional light comes from one direction and is stronger when hitting a surface squarely and weaker if it hits at a a gentle angle.
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After hitting a surface, a directional lights scatters in all directions. Lights need to be included in the <b>draw()</b> to remain persistent in a looping program.
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Placing them in the <b>setup()</b> of a looping program will cause them to only have an effect the first time through the loop.
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The affect of the <b>v1</b>, <b>v2</b>, and <b>v3</b> parameters is determined by the current color mode.
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The <b>nx</b>, <b>ny</b>, and <b>nz</b> parameters specify the direction the light is facing.
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For example, setting <b>ny</b> to -1 will cause the geometry to be lit from below (the light is facing directly upward).</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>directionalLight(<kbd>v1</kbd>,<kbd>v2</kbd>,<kbd>v3</kbd>,<kbd>nx</kbd>,<kbd>ny</kbd>,<kbd>nz</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">v1</th>
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<td>int or float: red or hue value</td>
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</tr>
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<tr class="">
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<th scope="row">v2</th>
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<td>int or float: green or hue value</td>
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</tr>
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<tr class="">
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<th scope="row">v3</th>
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<td> int or float: green or hue value</td>
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</tr>
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<tr class="">
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<th scope="row">nx</th>
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<td>int or float: direction along the x axis</td>
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</tr>
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<tr class="">
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<th scope="row">ny</th>
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<td>int or float: direction along the y axis</td>
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</tr>
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<tr class="">
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<th scope="row">nz</th>
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<td>int or float: direction along the z axis</td>
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</tr>
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</table></td>
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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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</tr>
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<tr class="">
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<th scope="row">Related</th>
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<td><a href="lights_.1">lights()</a><br />
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<a href="ambientLight_.1">ambientLight()</a><br />
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<a href="pointLight_.1">pointLight_()</a><br />
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<a href="spotLight_.1">spotLight()</a><br /></td>
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</tr>
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</table>
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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Processing is an open visualization language developed by
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<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
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and originally ported to Javascript by
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