DirectionalLight QML Type

Defines a directional light in the scene. 更多...

import 语句：	import QtQuick3D
继承：	Light

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详细描述

The directional light emits light in one direction from an unidentifiable source located infinitely far away. This is similar to the way sunlight works in real life. A directional light has infinite range and does not diminish.

若 castsShadow is enabled, shadows will be parallel to the light direction.

A directional light effectively have no position, so moving it does not have any effect. The light will always be emitted in the direction of the light's Z axis.

Rotating the light along its X or Y axis will change the direction of the light emission.

Scaling a directional light will only have an effect in the following cases:

• If Z scale is set to a negative number, the light will be emitted in the opposite direction.

• If the scale of any axis is set to 0, the light will be emitted along the world's Z axis.

  注意： Rotating the light will then have no effect.

Let's look at a simple example:

import QtQuick
import QtQuick3D
View3D {
    anchors.fill: parent
    PerspectiveCamera { z: 600 }
    DirectionalLight {
    }
    Model {
        source: "#Sphere"
        scale: Qt.vector3d(4, 4, 4)
        materials: PrincipledMaterial {
            baseColor: "#40c060"
            roughness: 0.1 // make specular highlight visible
        }
    }
}
					

Here the DirectionalLight uses the default white color, emitting in the direction of the DirectionalLight node's Z axis.

Rotating 60 degrees around the X axis would lead to the following. Instead of emitting straight in the direction of the Z axis, the light is now pointing 60 degrees "down":

DirectionalLight {
    eulerRotation.x: 60
}
					

For further usage examples, see Qt Quick 3D - 灯光范例 .

另请参阅 PointLight and SpotLight .

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