Encapsulate a Spot Light object in a Qt 3D scene. 更多...
| import 语句： | import Qt3D.Render 2.7 |
| 实例化： | QSpotLight |
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.
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constantAttenuation : float |
Specifies the constant attenuation of the spot light.
注意： The exact meaning and use of this property is up to the material implementation.
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cutOffAngle : float |
Specifies the cut off angle of the spot light.
注意： The exact meaning and use of this property is up to the material implementation.
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linearAttenuation : float |
Specifies the linear attenuation of the spot light.
注意： The exact meaning and use of this property is up to the material implementation.
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localDirection : vector3d |
Specifies the local direction of the spot light.
注意： The exact meaning and use of this property is up to the material implementation.
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quadraticAttenuation : float |
Specifies the quadratic attenuation of the spot light.
注意： The exact meaning and use of this property is up to the material implementation.
