Qt 5.11 | Qt 3D | C++ Classes | QEffect

Qt 5.11.3 Reference Documentation

# QEffect Class

(Qt3DRender::QEffect)

The base class for effects in a Qt 3D scene. More...

Header: | #include <QEffect>
qmake: | QT += 3drender
Since: | Qt 5.7
Instantiated By: | Effect
Inherits: | Qt3DCore::QNode

- List of all members, including inherited members

## Public Functions

| QEffect(Qt3DCore::QNode *parent = nullptr)
virtual | ~QEffect()
void | addParameter(Qt3DRender::QParameter *parameter)
void | addTechnique(Qt3DRender::QTechnique *t)
QVector<Qt3DRender::QParameter *> | parameters() const
void | removeParameter(Qt3DRender::QParameter *parameter)
void | removeTechnique(Qt3DRender::QTechnique *t)
QVector<Qt3DRender::QTechnique *> | techniques() const

- 13 public functions inherited from Qt3DCore::QNode

### Additional Inherited Members

- 3 properties inherited from Qt3DCore::QNode
- 3 public slots inherited from Qt3DCore::QNode
- 4 signals inherited from Qt3DCore::QNode
- 2 protected functions inherited from Qt3DCore::QNode

## Detailed Description

The base class for effects in a Qt 3D scene.

The QEffect class combines a set of techniques and parameters used by those techniques to produce a rendering effect for a material.

An QEffect instance should be shared among several QMaterial instances when possible.

      QEffect *effect = new QEffect();

      // Create technique, render pass and shader
      QTechnique *gl3Technique = new QTechnique();
      QRenderPass *gl3Pass = new QRenderPass();
      QShaderProgram *glShader = new QShaderProgram();

      // Set the shader on the render pass
      gl3Pass->setShaderProgram(glShader);

      // Add the pass to the technique
      gl3Technique->addRenderPass(gl3Pass);

      // Set the targeted GL version for the technique
      gl3Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
      gl3Technique->graphicsApiFilter()->setMajorVersion(3);
      gl3Technique->graphicsApiFilter()->setMinorVersion(1);
      gl3Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::CoreProfile);

      // Add the technique to the effect
      effect->addTechnique(gl3Technique);

A QParameter defined on an Effect is overridden by a QParameter (of the same name) defined in a QMaterial, QTechniqueFilter, QRenderPassFilter.

See also QMaterial, QTechnique, and QParameter.

## Member Function Documentation

### QEffect::QEffect(Qt3DCore::QNode *parent = nullptr)

Default constructs an instance of QEffect.

### `[virtual]` QEffect::~QEffect()

Destroys the instance of QEffect. The destructor is virtual.

### void QEffect::addParameter(Qt3DRender::QParameter *parameter)

Adds parameter to the effect. It sends a QPropertyNodeAddedChange to the backend. The parameter will be used to set a corresponding uniform value in the shader used by this effect.

### void QEffect::addTechnique(Qt3DRender::QTechnique *t)

Adds a new technique t to the effect. It sends a QPropertyNodeAddedChange to the backend.

### QVector<Qt3DRender::QParameter *> QEffect::parameters() const

Returns the list of parameters used by the effect.

### void QEffect::removeParameter(Qt3DRender::QParameter *parameter)

Removes a parameter parameter from the effect.

### void QEffect::removeTechnique(Qt3DRender::QTechnique *t)

Removes a technique t from the effect.

### QVector<Qt3DRender::QTechnique *> QEffect::techniques() const

Returns the list of techniques used by the effect.