SpotLight QML Type

Encapsulate a Spot Light object in a Qt 3D scene. More...

Import Statement: import Qt3D.Render 2.14
Since: Qt 5.5
Instantiates: QSpotLight

Properties

Detailed Description

A spotlight is a light source that emits a cone of light in a particular direction.

A spotlight uses three attenuation factors to describe how the intensity of the light decreases over distance. These factors are designed to be used together in calcuating total attenuation. For the materials in Qt3D Extras the following formula is used, where distance is the distance from the light to the surface being rendered:

totalAttenuation = 1.0 / (constantAttenuation + (linearAttenuation * distance) + (quadraticAttenuation * distance * distance));

Custom materials may choose to interpret these factors differently.

Property Documentation

constantAttenuation : float

Specifies the constant attenuation of the spot light.

Note: The exact meaning and use of this property is up to the material implementation.


cutOffAngle : float

Specifies the cut off angle of the spot light.

Note: The exact meaning and use of this property is up to the material implementation.


linearAttenuation : float

Specifies the linear attenuation of the spot light.

Note: The exact meaning and use of this property is up to the material implementation.


localDirection : vector3d

Specifies the local direction of the spot light.

Note: The exact meaning and use of this property is up to the material implementation.


quadraticAttenuation : float

Specifies the quadratic attenuation of the spot light.

Note: The exact meaning and use of this property is up to the material implementation.


© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.