AbstractRayCaster QML Type

用于在 3D 场景中，投射光线的抽象基类。 更多...

import 语句：	import Qt3D.Render 2.5
实例化：	QAbstractRayCaster

• 所有成员列表，包括继承成员

特性

• filterMode : enumeration
• hits : array
• runMode : enumeration

详细描述

AbstractRayCaster is an abstract base class for casting rays into a 3d scene. AbstractRayCaster can not be directly instantiated, but rather through its subclasses. QAbstractRayCaster specifies common properties for all ray casters, such as run mode and layer handling, while leaving the actual ray casting details to the subclasses.

Ray castings differs from picking (using ObjectPicker ) in that it does not require mouse events to trigger.

By default, the instances of AbstractRayCaster are disabled. When enabled, the specified ray will be tested for intersecting objects at every frame. The AbstractRayCaster.hits property will be updated with the results of the ray casting, even if no objects are found.

The Qt3D.Render::PickingSettings can be used to control the ray casting, such as which primitives are tested and how the results are returned.

Furthermore, Qt3D.Render::Layer components can be used to control how entities, or entity sub-graphs, react to ray casting.

Note: components derived from AbstractRayCaster should not be shared amount multiple entities.

另请参阅 Qt3D.Render::RayCaster , Qt3D.Render::ScreenRayCaster , Qt3D.Render::ObjectPicker , Qt3D.Render::PickingSettings ，和 Qt3D.Render::NoPicking .

特性文档编制

filterMode : enumeration

Holds the filter mode specifying the entities to select for ray casting tests.

默认值为 AbstractRayCaster.AcceptMatchingLayers .

常量	描述
AcceptAnyMatchingLayers	Accept entities that reference one or more 层 objects added to this AbstractRayCaster . This is the default
AcceptAllMatchingLayers	Accept entities that reference all the 层 objects added to this AbstractRayCaster
DiscardAnyMatchingLayers	Discard entities that reference one or more 层 objects added to this AbstractRayCaster
DiscardAllMatchingLayers	Discard entities that reference all 层 objects added to this AbstractRayCaster

[read-only] hits : array

Holds the results of last ray casting test as an array of javascript objects. The fields defined on the objects are defined below.

{
    type // enum value of RayCasterHit.HitType
    entity // entity that was intersected
    distance // distance from ray origin to intersection
    localIntersection.x: // coordinate of intersection in the entity's coordinate system
    localIntersection.y
    localIntersection.z
    worldIntersection.x // coordinate of intersection in the model's coordinate system
    worldIntersection.y
    worldIntersection.z
    primitiveIndex // index of the primitive (triangle, line, point) that was intersected;
                   // (undefined if the picking mode is set to bounding volume)
    vertex1Index // index of the first point of the triangle or line that was intersected
                 // (undefined if the picking mode is set to bounding volume or points)
    vertex2Index // index of the second point of the triangle or line that was intersected
                 // (undefined if the picking mode is set to bounding volume or points)
    vertex3Index // index of the second point of the triangle that was intersected
                 // (undefined if the picking mode is set to bounding volume, points or lines)
}
							

Note that even if successive tests return the exact same results (or empty results), a change notification will be emitted at every test.

runMode : enumeration

Holds the run mode controlling how often ray casting tests are performed.

常量	描述
Continuous	Ray casting is performed at every frame as long as the component is enabled.
SingleShot	Ray casting is done once then the component disables itself. This is the default

内容

• 特性

• 详细描述