要导入和使用模块的 QML 类型，使用下列语句：
import Qt3D.Render 2.5
渲染方面带有 2 种渲染后端。
If you are targeting OpenGL exclusively and are using specific OpenGL features, you might be better off using the OpenGL backend. This is the OpenGL backend that Qt 3D exclusively used in the Qt 5 series.
For cases where you are not using specific OpenGL features and want to target different platforms that might have deprecated OpenGL, using the RHI backend is a better alternative.
To select your rendering backend, the environment variable QT3D_RENDERER is to be set to either "opengl" or "rhi". Defaults to the OpenGL backend.
When using the RHI backend, you can further force the internal RHI backend by setting the QSG_RHI_BACKEND to one of the following values:
If not specified, RHI will default to what it deduces to be the best backend for the platform.
Alternatively, if using a QQuickWindow , QQuickWindow::setGraphicsApi () can be used to specify the RHI internal rendering backend.
| AbstractRayCaster | 用于在 3D 场景中，投射光线的抽象基类 |
| AbstractTexture | 用于提供纹理的基类 |
| AbstractTextureImage | Encapsulates the necessary information to create an OpenGL texture image |
| AlphaCoverage | Enable alpha-to-coverage multisampling mode |
| AlphaTest | 指定 Alpha 参考测试 |
| BlendEquation | Specifies the equation used for both the RGB blend equation and the Alpha blend equation |
| BlendEquationArguments | Encapsulates blending information: specifies how the incoming values (what's going to be drawn) are going to affect the existing values (what is already drawn) |
| BlitFramebuffer | FrameGraph node to transfer a rectangle of pixel values from one region of a render target to another |
| BufferCapture | Exchanges buffer data between GPU and CPU |
| Camera | Defines a view point through which the scene will be rendered |
| CameraLens | Provides the projection matrix that is used to define a Camera for 3D scene |
| CameraSelector | Class to allow for selection of camera to be used |
| ClearBuffers | 用于清零缓冲的类 |
| ClipPlane | Enables an additional OpenGL clipping plane that can be in shaders using gl_ClipDistance |
| ColorMask | Allows specifying which color components should be written to the currently bound frame buffer |
| ComputeCommand | Component to issue work for the compute shader on GPU |
| CullFace | Type specifies whether front or back face culling is enabled |
| DebugOverlay | Enables a visual overlay with scene details |
| DepthRange | Enables remapping depth values written into the depth buffer |
| DepthTest | Type tests the fragment shader's depth value against the depth of a sample being written to |
| DirectionalLight | Encapsulate a Directional Light object in a Qt 3D scene |
| DispatchCompute | FrameGraph node to issue work for the compute shader on GPU |
| Dithering | 启用抖动 |
| Effect | Base class for effects in a Qt 3D scene |
| EnvironmentLight | Encapsulate an environment light object in a Qt 3D scene |
| FilterKey | Stores filter keys and their values |
| FrameGraphNode | Base class of all FrameGraph configuration nodes |
| FrontFace | Type defines front and back facing polygons |
| FrustumCulling | Enable frustum culling for the FrameGraph |
| GeometryRenderer | 封装几何体渲染 |
| GraphicsApiFilter | For OpenGL identifies the API required for the attached technique |
| 层 | Way of filtering which entities will be rendered |
| LayerFilter | Controls layers drawn in a frame graph branch |
| LevelOfDetail | Way of controlling the complexity of rendered entities based on their size on the screen |
| LevelOfDetailBoundingSphere | QML type provides a simple spherical volume, defined by its center and radius |
| LevelOfDetailLoader | An entity loader that changes depending on distance to camera or screen size |
| LevelOfDetailSwitch | Provides a way of enabling child entities based on distance or screen size |
| Light | 将 QAbstractLight 对象封装在 Qt 3D 场景中 |
| LineWidth | Specifies the width of rasterized lines |
| Material | Non-creatable abstract base for materials |
| MemoryBarrier | Class to place a memory barrier |
| Mesh | 自定义网格加载器 |
| MultiSampleAntiAliasing | Enable multisample antialiasing |
| NoDepthMask | Disable depth write |
| NoDraw | When a NoDraw node is present in a FrameGraph branch, this prevents the renderer from rendering any primitive |
| NoPicking | When a NoPicking node is present in a FrameGraph branch, this prevents the render aspect from performing picking selection for the given branch |
| ObjectPicker | Instantiates a component that can be used to interact with an Entity by a process known as picking |
| 参数 | Provides storage for a name and value pair. This maps to a shader uniform |
| PickEvent | Holds information when an object is picked. This is received as a parameter in most of the QObjectPicker component signals when picking succeeds |
| PickLineEvent | Holds information when a segment of a line is picked |
| PickPointEvent | Holds information when a segment of a point cloud is picked |
| PickTriangleEvent | Holds information when a triangle is picked |
| PickingProxy | Can be used to provide an alternate GeometryView used only for picking |
| PickingSettings | Specifies how entity picking is handled |
| PointLight | Encapsulate a Point Light object in a Qt 3D scene |
| PointSize | Specifies the size of rasterized points. May either be set statically or by shader programs |
| PolygonOffset | Type sets the scale and steps to calculate depth values for polygon offsets |
| ProximityFilter | Select entities which are within a distance threshold of a target entity |
| RasterMode | Render state allows to control the type of rasterization to be performed |
| RayCaster | Used to perform ray casting tests in 3d world coordinates |
| RenderCapabilities | QRenderCapabilities class holds settings related to available rendering engines |
| RenderCapture | Capture rendering |
| RenderCaptureReply | Receives render capture result |
| RenderPass | Encapsulates a Render Pass |
| RenderPassFilter | Provides storage for vectors of Filter Keys and Parameters |
| RenderSettings | Type holds settings related to rendering process and host the active FrameGraph |
| RenderState | An abstract base type for all render states |
| RenderStateSet | FrameGraph node offers a way of specifying a set of RenderState objects to be applied during the execution of a framegraph branch |
| RenderSurfaceSelector | Provides a way of specifying the render surface |
| RenderTarget | Encapsulates a target (usually a frame buffer object) which the renderer can render into |
| RenderTargetOutput | Type allows the specification of an attachment of a render target (whether it is a color texture, a depth texture, etc... ) |
| RenderTargetSelector | Provides a way of specifying a render target |
| SceneLoader | 提供加载现有场景的设施 |
| ScissorTest | Type discards fragments that fall outside of a certain rectangular portion of the screen |
| ScreenRayCaster | Performe ray casting test based on screen coordinates |
| SeamlessCubemap | Enables seamless cubemap texture filtering |
| ShaderImage | Provides Image access to shader programs |
| ShaderProgram | Encapsulates a Shader Program |
| ShaderProgramBuilder | Generates a Shader Program content from loaded graphs |
| SharedGLTexture | Allows to use a textureId from a separate OpenGL context in a Qt 3D scene |
| SortPolicy | Provides storage for the sort types to be used |
| SpotLight | Encapsulate a Spot Light object in a Qt 3D scene |
| StencilMask | Type controls the front and back writing of individual bits in the stencil planes |
| StencilOperation | Type specifies stencil operation |
| StencilOperationArguments | Type sets the actions to be taken when stencil and depth tests fail |
| StencilTest | Type specifies arguments for the stecil test |
| StencilTestArguments | Type specifies arguments for stencil test |
| SubtreeEnabler | Enables or disables entire subtrees of frame graph nodes |
| Technique | 封装技术 |
| TechniqueFilter | A FrameGraphNode used to select used Techniques |
| Texture1D | An AbstractTexture with a Target1D target format |
| Texture1DArray | An AbstractTexture with a Target1DArray target format |
| Texture2D | An AbstractTexture with a Target2D target format |
| Texture2DArray | An AbstractTexture with a Target2DArray target format |
| Texture2DMultisample | An AbstractTexture with a Target2DMultisample target format |
| Texture2DMultisampleArray | An AbstractTexture with a Target2DMultisampleArray target format |
| Texture3D | An AbstractTexture with a Target3D target format |
| TextureBuffer | An AbstractTexture with a TargetBuffer target format |
| TextureCubeMap | An AbstractTexture with a TargetCubeMap target format |
| TextureCubeMapArray | An AbstractTexture with a TargetCubeMapArray target format |
| TextureImage | Encapsulates the necessary information to create an OpenGL texture image from an image source |
| TextureLoader | Handles the texture loading and setting the texture's properties |
| TextureRectangle | An AbstractTexture with a TargetRectangle target format |
| Viewport | A viewport on the Qt3D Scene |
