Ogre light attenuation shortcut

Original article address:

Http://www.ogre3d.org/tikiwiki/tiki-index.php? Page = light + attenuation + shortcut

Common coefficient:

Range constant linear quadratic

3250, 1.0, 0.0014, 0.000007

600, 1.0, 0.007, 0.0002

325, 1.0, 0.014, 0.0007

200, 1.0, 0.022, 0.0019

160, 1.0, 0.027, 0.0028

100, 1.0, 0.045, 0.0075

65, 1.0, 0.07, 0.017

50, 1.0, 0.09, 0.032

32, 1.0, 0.14, 0.07

20, 1.0, 0.22, 0.20

13, 1.0, 0.35, 0.44

7, 1.0, 0.7, 1.8

 

You can determine the linear and quadratic values (or what is always Ally close enough) for any range you wish to use:

• Linear = 4.5/lightrange
• Quadratic = 75.0/lightrange ^ 2

Here is a function to calculate attenuation based on the light range:

void setLightRange( Ogre::Light *L, Ogre::Real Range ) { L->setAttenuation( Range, 1.0f, 4.5/Range, 75.0f/(Range*Range) ); }