Light Attenuation   

Light Attenuation

Light attenuation determines how fast the light intensity decreases with distance from objects. 100% is the default and corresponds to the traditional A:M light attenuation. The traditional A:M light attenuation is quadratic, meaning that the light intensity decreases proportionally to the square of the distance increase. Other useful attenuations are common such as linear where light intensity decreases at the same rate as the distance increases and constant where light intensity never decreases. By setting the attenuation to 50%, the attenuation is linear and at 0% the light attenuation is constant. Values between 0% and 50% will results in attenuations between constants and linear and values between 50% and 100% will result in attenuation faster than linear but slower than quadratic.

100% Attenuation (quadratic)
This is traditional A:M light attenuation

At 100% attenuation, light intensity decreases quadraticly with distance from objects. Double the distance results in 1/4 light intensity.

75% attenuation

50% attenuation (linear)

At 50% attenuation, light intensity decreases linearly with distance from objects. Double the distance results in half the light intensity.

25% attenuation

0% attenuation (constant)

Light intensity is constant. It does not decreases with distance to objects.

Back