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QEffect Class

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

This class was introduced in Qt 5.7.

Public Functions

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

Detailed Description

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.

Note: QEffect node can not be disabled.

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 a QEffect overrides parameter (of the same name) defined in QTechnique and QRenderPass, but are overridden by parameter in QRenderPassFilter, QTechniqueFilter and QMaterial.

See also QMaterial, QTechnique, and QParameter.

Member Function Documentation

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

Adds parameter to the effect. It sends an update 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 an update 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.

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