Area lights are two-dimensional rectangular light sources. They are useful for simulating the rectangular reflections of windows on surfaces. An area light is initially two units long and one unit wide. Use and to re-size an area light.
The diffuse component of area lights is very small. To increase diffusion, move the light further away and increase its value. Area light shadows are much more costly than point light shadows. The increase in processing cost is proportional to the complexity of the scene and the size of the area light.
The brightness of the light. If the light exerts a force, this value sets its strength. A light with an value of 0 produces no light. A light with negative value removes light from a scene in the area of the light’s influence. The slider range is 0 to 100. The default value is 1.
Controls how quickly light intensity decreases with distance. The setting has no effect at distances less than 1 unit. If is set (that is, not ) under , the value controls how quickly the force intensity decreases with distance.
|no decay; light reaches everything|
|light intensity decreases directly (linearly) with distance (slower than real world light)|
|light intensity decreases proportionally with the square of distance (the same as real world light)|
|light intensity decreases proportionally with the cube of distance (faster than real world light)|