SpotLight QML Type
Encapsulate a Spot Light object in a Qt 3D scene. More...
| Import Statement: | import Qt3D.Render 2.12 |
| Since: | Qt 5.5 |
| Instantiates: | QSpotLight |
Properties
- constantAttenuation : float
- cutOffAngle : float
- linearAttenuation : float
- localDirection : vector3d
- quadraticAttenuation : float
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
localDirection : vector3d |
Specifies the local direction of the spot light