Qt 3D Render C++ Classes

The Qt 3D Render module contains functionality to support 2D and 3D rendering using Qt 3D. More...

Namespaces

Qt3DRender	Contains classes that enable 2D and 3D rendering
Qt3DRender::Render	Namespace used for accessing the classes Renderer and QRenderPlugin

Classes

Qt3DRender::QAbstractLight	Encapsulate a QAbstractLight object in a Qt 3D scene
Qt3DRender::QAbstractRayCaster	An abstract base class for ray casting in 3d scenes
Qt3DRender::QAbstractTexture	A base class to be used to provide textures
Qt3DRender::QAbstractTextureImage	Encapsulates the necessary information to create an OpenGL texture image
Qt3DRender::QAlphaCoverage	Enable alpha-to-coverage multisampling mode
Qt3DRender::QAlphaTest	Specify alpha reference test
Qt3DRender::QBlendEquation	Specifies the equation used for both the RGB blend equation and the Alpha blend equation
Qt3DRender::QBlendEquationArguments	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)
Qt3DRender::QBlitFramebuffer	FrameGraph node to transfer a rectangle of pixel values from one region of a render target to another
Qt3DRender::QBufferCapture	Exchanges buffer data between GPU and CPU
Qt3DRender::QCamera	Defines a view point through which the scene will be rendered
Qt3DRender::QCameraLens	Qt3DRender::QCameraLens specifies the projection matrix that will be used to define a Camera for a 3D scene
Qt3DRender::QCameraSelector	Class to allow for selection of camera to be used
Qt3DRender::QClearBuffers	Class to clear buffers
Qt3DRender::QClipPlane	Enables an additional OpenGL clipping plane that can be in shaders using gl_ClipDistance
Qt3DRender::QColorMask	Allows specifying which color components should be written to the currently bound frame buffer
Qt3DRender::QComputeCommand	QComponent to issue work for the compute shader on GPU
Qt3DRender::QCullFace	Specifies whether front or back face culling is enabled
Qt3DRender::QDebugOverlay	Enables a visual overlay with scene details
Qt3DRender::QDepthRange	Enables remapping depth values written into the depth buffer
Qt3DRender::QDepthTest	Tests the fragment shader's depth value against the depth of a sample being written to
Qt3DRender::QDirectionalLight	Encapsulate a Directional Light object in a Qt 3D scene
Qt3DRender::QDispatchCompute	FrameGraph node to issue work for the compute shader on GPU
Qt3DRender::QDithering	Enable dithering
Qt3DRender::QEffect	Base class for effects in a Qt 3D scene
Qt3DRender::QEnvironmentLight	Encapsulate an environment light object in a Qt 3D scene
Qt3DRender::QFilterKey	Storage for filter keys and their values
Qt3DRender::QFrameGraphNode	Base class of all FrameGraph configuration nodes
Qt3DRender::QFrontFace	Defines front and back facing polygons
Qt3DRender::QFrustumCulling	Enable frustum culling for the FrameGraph
Qt3DRender::QGeometryRenderer	Encapsulates geometry rendering
Qt3DRender::QGraphicsApiFilter	Identifies the API required for the attached QTechnique
Qt3DRender::QLayer	Way of filtering which entities will be rendered
Qt3DRender::QLayerFilter	Controls layers drawn in a frame graph branch
Qt3DRender::QLevelOfDetail	Way of controlling the complexity of rendered entities based on their size on the screen
Qt3DRender::QLevelOfDetailBoundingSphere	Simple spherical volume, defined by its center and radius
Qt3DRender::QLevelOfDetailSwitch	Provides a way of enabling child entities based on distance or screen size
Qt3DRender::QLineWidth	Specifies the width of rasterized lines
Qt3DRender::QMaterial	Provides an abstract class that should be the base of all material component classes in a scene
Qt3DRender::QMemoryBarrier	Class to emplace a memory barrier
Qt3DRender::QMesh	A custom mesh loader
Qt3DRender::QMultiSampleAntiAliasing	Enable multisample antialiasing
Qt3DRender::QNoDepthMask	Disable depth write
Qt3DRender::QNoDraw	When a Qt3DRender::QNoDraw node is present in a FrameGraph branch, this prevents the renderer from rendering any primitive
Qt3DRender::QNoPicking	When a Qt3DRender::QNoPicking node is present in a FrameGraph branch, this prevents the render aspect from performing picking selection for the given branch
Qt3DRender::QObjectPicker	Instantiates a component that can be used to interact with a QEntity by a process known as picking
Qt3DRender::QPaintedTextureImage	A QAbstractTextureImage that can be written through a QPainter
Qt3DRender::QParameter	Provides storage for a name and value pair. This maps to a shader uniform
Qt3DRender::QPickEvent	Holds information when an object is picked
Qt3DRender::QPickLineEvent	Holds information when a segment of a line is picked
Qt3DRender::QPickPointEvent	Holds information when a segment of a point cloud is picked
Qt3DRender::QPickTriangleEvent	Holds information when a triangle is picked
Qt3DRender::QPickingProxy	Can be used to provide an alternate QGeometryView used only for picking
Qt3DRender::QPickingSettings	Specifies how entity picking is handled
Qt3DRender::QPointLight	Encapsulate a Point Light object in a Qt 3D scene
Qt3DRender::QPointSize	Specifies the size of rasterized points. May either be set statically or by shader programs
Qt3DRender::QPolygonOffset	Sets the scale and steps to calculate depth values for polygon offsets
Qt3DRender::QProximityFilter	Select entities which are within a distance threshold of a target entity
Qt3DRender::QRasterMode	Render state allows to control the type of rasterization to be performed
Qt3DRender::QRayCaster	Qt3DRender::QRayCaster is used to perform ray casting tests in 3d world coordinates
Qt3DRender::QRayCasterHit	Details of a hit when casting a ray through a model
Qt3DRender::QRenderAspect	Class
Qt3DRender::QRenderCapabilities	Holds settings related to available rendering engines
Qt3DRender::QRenderCapture	Frame graph node for render capture
Qt3DRender::QRenderCaptureReply	Receives the result of render capture request
Qt3DRender::QRenderPass	Encapsulates a Render Pass
Qt3DRender::QRenderPassFilter	Provides storage for vectors of Filter Keys and Parameters
Qt3DRender::QRenderSettings	Holds settings related to rendering process and host the active FrameGraph
Qt3DRender::QRenderState	An abstract base class for all render states
Qt3DRender::QRenderStateSet	FrameGraph node offers a way of specifying a set of QRenderState objects to be applied during the execution of a framegraph branch
Qt3DRender::QRenderSurfaceSelector	Provides a way of specifying the render surface
Qt3DRender::QRenderTarget	Encapsulates a target (usually a frame buffer object) which the renderer can render into
Qt3DRender::QRenderTargetOutput	Allows the specification of an attachment of a render target (whether it is a color texture, a depth texture, etc... )
Qt3DRender::QRenderTargetSelector	Provides a way of specifying a render target
Qt3DRender::QSceneLoader	Provides the facility to load an existing Scene
Qt3DRender::QScissorTest	Discards fragments that fall outside of a certain rectangular portion of the screen
Qt3DRender::QScreenRayCaster	Performe ray casting test based on screen coordinates
Qt3DRender::QSeamlessCubemap	Enables seamless cubemap texture filtering
Qt3DRender::QSetFence	FrameGraphNode used to insert a fence in the graphics command stream
Qt3DRender::QShaderData	Provides a way of specifying values of a Uniform Block or a shader structure
Qt3DRender::QShaderImage	Provides Image access to shader programs
Qt3DRender::QShaderProgram	Encapsulates a Shader Program
Qt3DRender::QShaderProgramBuilder	Generates a Shader Program content from loaded graphs
Qt3DRender::QSharedGLTexture	Allows to use a textureId from a separate OpenGL context in a Qt 3D scene
Qt3DRender::QSortPolicy	Provides storage for the sort types to be used
Qt3DRender::QSpotLight	Encapsulate a Spot Light object in a Qt 3D scene
Qt3DRender::QStencilMask	Controls the front and back writing of individual bits in the stencil planes
Qt3DRender::QStencilOperation	Specifies stencil operation
Qt3DRender::QStencilOperationArguments	Sets the actions to be taken when stencil and depth tests fail
Qt3DRender::QStencilTest	Specifies arguments for the stecil test
Qt3DRender::QStencilTestArguments	Specifies arguments for stencil test
Qt3DRender::QSubtreeEnabler	Enables or disables entire subtrees of framegraph nodes
Qt3DRender::QTechnique	Encapsulates a Technique
Qt3DRender::QTechniqueFilter	A QFrameGraphNode used to select QTechniques to use
Qt3DRender::QTexture1D	A QAbstractTexture with a Target1D target format
Qt3DRender::QTexture1DArray	A QAbstractTexture with a Target1DArray target format
Qt3DRender::QTexture2D	A QAbstractTexture with a Target2D target format
Qt3DRender::QTexture2DArray	A QAbstractTexture with a Target2DArray target format
Qt3DRender::QTexture2DMultisample	A QAbstractTexture with a Target2DMultisample target format
Qt3DRender::QTexture2DMultisampleArray	A QAbstractTexture with a Target2DMultisampleArray target format
Qt3DRender::QTexture3D	A QAbstractTexture with a Target3D target format
Qt3DRender::QTextureBuffer	A QAbstractTexture with a TargetBuffer target format
Qt3DRender::QTextureCubeMap	A QAbstractTexture with a TargetCubeMap target format
Qt3DRender::QTextureCubeMapArray	A QAbstractTexture with a TargetCubeMapArray target format
Qt3DRender::QTextureData	Stores texture information such as the target, height, width, depth, layers, wrap, and if mipmaps are enabled
Qt3DRender::QTextureDataUpdate	Holds content and information required to perform partial updates of a texture content
Qt3DRender::QTextureGenerator	Provides the image data for a texture
Qt3DRender::QTextureImage	Encapsulates the necessary information to create an OpenGL texture image from an image source
Qt3DRender::QTextureImageData	Stores data representing a texture
Qt3DRender::QTextureImageDataGenerator	Provides texture image data for QAbstractTextureImage
Qt3DRender::QTextureLoader	Handles the texture loading and setting the texture's properties
Qt3DRender::QTextureRectangle	A QAbstractTexture with a TargetRectangle target format
Qt3DRender::QTextureWrapMode	Defines the wrap mode a Qt3DRender::QAbstractTexture should apply to a texture
Qt3DRender::QViewport	A viewport on the Qt3D Scene
Qt3DRender::QWaitFence	FrameGraphNode used to wait for a fence in the graphics command stream to become signaled

Detailed Description

The Qt 3D Render module provides an aspect, components, and other supporting types necessary to implement 2D and 3D rendering as part of the Qt 3D framework.

To use classes from this module, add this directive into the C++ files:

#include <Qt3DRender>

To link against the corresponding C++ library, add the following to your qmake project file:

QT += 3drender

Classes, types, and functions are declared under the Qt3DRender namespace.

Overview

The Qt 3D Render aspect offers support for data-driven configuration as described in Qt 3D Render Framegraph.

Selecting a Rendering Backend

The Render aspect comes with two rendering backends.

OpenGL backend (ES 2, ES 3.2, GL 2, GL 3, GL 3.2, GL 4.3)
RHI backend (ES 2, GL, DirectX, Vulkan, Metal)

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:

opengl -> RHI OpenGL backend
gl -> RHI OpenGL backend
gles2 -> RHI OpenGL backend
metal -> RHI Metal backend
vulkan -> RHI Vulkan backend
d3d11 -> RHI DirectX 11 backend

If not specified, RHI will default to what it deduces to be the best backend for the platform.

Reference

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