Light Omni

Light Omni is a point source emitting light in all directions (360 degrees) and realistically reproducing shadow cast. This type of light serves to simulate light sources with bright center and equal roll-off of intensity. An example of such a light is an ordinary household lightbulb, uncovered and hanging from the ceiling. Light Omni proves useful for general lighting purposes in indoor scenes because of its nondirectional qualities.

Please note that as Light Omni uses cubemap modulation, the shadowing by this source requires 6 passes and can be expensive.

Light Omni has a variety of shapes and, therefore, can be used to create area lights, for example, realistic interior or street lights.

Example scene that uses Light Omni

Light Settings#

Mode	The type of texture used to define light's distribution: IES — light distibution is defined by the IES profile, a lighting industry standard of describing how the light is cast based on real-world measured light fixtures. Light Omni sources without and with IES profile Simple — a cubemap texture is projected by Light Omni. Such modulations allow you to re-light the affected scene area in a new way at the same performance cost, create variegated light scattering patterns and, for example, imitate several light sources. Cubemap texture Modulation by texture
Texture	A cubemap or IES texture projected by Light Omni.

Mode

The type of texture used to define light's distribution:

IES — light distibution is defined by the IES profile, a lighting industry standard of describing how the light is cast based on real-world measured light fixtures.

Light Omni sources without and with IES profile
Simple — a cubemap texture is projected by Light Omni. Such modulations allow you to re-light the affected scene area in a new way at the same performance cost, create variegated light scattering patterns and, for example, imitate several light sources.

Cubemap texture

Modulation by texture

Texture

A cubemap or IES texture projected by Light Omni.

Shadow Settings#

Enabled	Toggles rendering of shadows produced by this light source on and off.
Shadow Side Enabled	Light Omni makes shadows to be cast to the six cubemap sides. By default, shadows are cast in all directions: positive and negative X axis, positive and negative Y axis, and positive and negative Z axis. Any direction can be disabled, if necessary.

In This Article:

See Also#

Adding Light Omni#

Setting Light Omni Parameters#

Light Settings#

Shadow Settings#