- Qt 5.15
- Qt 3D
- QML Types
- PointLight QML Type
- Qt 5.15.2 Reference Documentation

# PointLight QML Type

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

Import Statement: | import Qt3D.Render 2.15
Since: | Qt 5.5

- List of all members, including inherited members

## Properties

- constantAttenuation : float
- linearAttenuation : float
- quadraticAttenuation : float

## Detailed Description

A point light is a light source that emits light in all directions, from a single point. Conceptually, this is similar to light given off by a standard light bulb.

A point light 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 point light.

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

linearAttenuation : float

Specifies the linear attenuation of the point light.

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

quadraticAttenuation : float

Specifies the quadratic attenuation of the point light.

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