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Plane#

A plane light simulates a flat quad or disk shaped emissive surface. This light can be either single sided to illuminate forward or double sided to illuminate in both directions. The direction of illumination can be changed with the Direction attribute.

Light Geometry#

It is possible to simulate light coming from a flat disk-shaped surface by changing it with the Shape attribute.

Attribute Description
Shape Define the shape of the plane light which can be either a square or a disk-shaped surface.
Radius Define the radius (or half width) of the plane light.

Square shaped area light

Disk shaped area light

Barn doors#

It is possible to simulate simple barn doors surrounding the light using the Cone Angle attribute and the Cone Softness so that the plane light acts like a spot light.

Attribute Description
Cone Angle Set the angle of the light frustum. This is used to simulate barn doors on a spot light.
Cone Softness Set the softness of the barn door penumbra.

Default Square-shaped Plane

Squareshaped Plane

Square-shaped Plane with a Cone Angle set to 90% and Cone Softness to 10%

Squareshaped Plane with a Cone Angle set to 90% and Softness to 10%

Default Disk-shaped plane

Diskshaped plane

Disk-shaped Plane with a Cone Angle set to 90% and Cone Softness to 10% Diskshaped Plane with a Cone Angle set to 90% and Softness to 10%