Defines a Perspective Camera for viewing the content of a 3D scene. 更多...
| import 语句： | import QtQuick3D |
| 继承： | Camera |
| 继承者： | FrustumCamera |
A Camera defines how the content of the 3D scene is projected onto a 2D surface, such as a View3D . A scene needs at least one Camera in order to visualize its contents.
It is possible to position and rotate the Camera like any other spatial Node in the scene. The Node 's location and orientation determines where the Camera is in the scene, and what direction it is facing. The default orientation of the Camera has its forward vector pointing along the negative Z axis and its up vector along the positive Y axis.
PerspectiveCamera is the standard Camera type. It gives a realistic projection of the scene, where distant objects are perceived as smaller. The frustum is defined by the fieldOfView property as well as near and far clip planes.
The following example creates a PerspectiveCamera at position [0, 200, 300] in the scene, a field of view of 90 degrees and with a 30 degree downward pitch.
PerspectiveCamera {
position: Qt.vector3d(0, 200, 300)
eulerRotation.x: -30
fieldOfView: 90
}
另请参阅 Qt Quick 3D - View3D 范例 , OrthographicCamera , FrustumCamera ，和 CustomCamera .
| FieldOfViewOrientation : enumeration |
This enum type specifies the orientation in which camera field of view is given.
| 常量 | 描述 |
|---|---|
PerspectiveCamera.Vertical
|
The provided field of view is vertical, meaning the field of view is the angle between the line traced from the camera to the center top of the viewport and the line from the camera to the center bottom of the viewport. The horizontal aspect ratio will be adjusted to maintain aspect ratio. This is the default orientation. |
PerspectiveCamera.Horizontal
|
The provided field of view is horizontal, meaning the field of view is the angle between the line traced from the camera to the center left side of the viewport and the line from the camera to the center right side of the viewport. The vertical aspect ratio will be adjusted to maintain aspect ratio. |
| clipFar : real |
This property defines the far clip plane of the PerspectiveCamera 's frustum. Geometry which is further away from the Camera than the far clip plane will not be visible.
The default value is 10000.0.
| clipNear : real |
This property defines the near clip plane of the PerspectiveCamera 's frustum. Geometry which is closer to the Camera than the near clip plane will not be visible.
The default value is 10.0.
| fieldOfView : real |
This property holds the field of view of the camera in degrees. This can be either the vertical or horizontal field of view depending on whether the
fieldOfViewOrientation
property is set to
PerspectiveCamera.Vertical
or
PerspectiveCamera.Horizontal
.
The default value is 60.0.
| fieldOfViewOrientation : enumeration |
This property determines if the field of view property reflects the vertical or the horizontal field of view.
It can be either of the following two values:
默认值为
PerspectiveCamera.Vertical
.