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<title>GAMGI Formats: Light Create</title>
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<h1>Light Create</h1>
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<ul>
<li><a href="create_type.html">Type</a></li>
<li><a href="create_color.html">Color</a></li>
<li><span>Attenuation</span></li>
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<h3>constant, linear, quadratic</h3>
Control the axial attenuation, defined only for positional
and spot lights. The axial attenuation factor is defined as:
<pre>
Axial Attenuation Factor = 1/(<b>constant</b> + <b>linear</b>*distance + <b>quadratic</b>*distance*distance)
Example: <b><light ... constant="1.0" linear="0.0" quadratic="0.0" radial="0.0"/></b> (default)
(defined in <b>GAMGI_MESA_LIGHT_CONSTANT</b>, <b>GAMGI_MESA_LIGHT_LINEAR</b>,
<b>GAMGI_MESA_LIGHT_QUADRATIC</b> and <b>GAMGI_MESA_LIGHT_RADIAL</b>)
Allowed values: positive real (optional)
</pre>
<h3>radial</h3>
Controls the radial attenuation, defined only for spot
lights. The radial attenuation factor is defined as:
<pre>
Radial Attenuation Factor = [max (0, vertex . direction)]**<b>radial</b>
Example: <b><light ... constant="1.0" linear="0.0" quadratic="0.0" radial="0.0"/></b> (default)
(defined in <b>GAMGI_MESA_LIGHT_CONSTANT</b>, <b>GAMGI_MESA_LIGHT_LINEAR</b>,
<b>GAMGI_MESA_LIGHT_QUADRATIC</b> and <b>GAMGI_MESA_LIGHT_RADIAL</b>)
Allowed values: positive real (optional)
</pre>
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