- Qt 5.15
- Qt 3D
- C++ Classes
- QMaterial
- Qt 5.15.11 Reference Documentation

# QMaterial Class

class Qt3DRender::QMaterial

Provides an abstract class that should be the base of all material component classes in a scene. More...

Header: | #include <QMaterial>
qmake: | QT += 3drender
Since: | Qt 5.5
Instantiated By: | Material
Inherits: | Qt3DCore::QComponent

Inherited By:

Qt3DExtras::QDiffuseMapMaterial, Qt3DExtras::QDiffuseSpecularMapMaterial, Qt3DExtras::QDiffuseSpecularMaterial, Qt3DExtras::QGoochMaterial, Qt3DExtras::QMetalRoughMaterial, Qt3DExtras::QMorphPhongMaterial, Qt3DExtras::QNormalDiffuseMapMaterial, Qt3DExtras::QNormalDiffuseSpecularMapMaterial, Qt3DExtras::QPerVertexColorMaterial, Qt3DExtras::QPhongAlphaMaterial, Qt3DExtras::QPhongMaterial, and Qt3DExtras::QTextureMaterial

This class was introduced in Qt 5.5.

- List of all members, including inherited members

## Properties

- effect : Qt3DRender::QEffect*

## Public Functions

void | addParameter(QParameter *parameter)
QEffect * | effect() const
QVector<QParameter *> | parameters() const
void | removeParameter(QParameter *parameter)

## Public Slots

void | setEffect(QEffect *effect)

## Signals

void | effectChanged(QEffect *effect)

## Detailed Description

QMaterial provides a way to specify the rendering of an entity. Any aspect can define its own subclass of QMaterial so that a Material can be used to describe a visual element; for example, the way sound should reflect off an element, the temperature of a surface, and so on.

In itself, a QMaterial doesn't do anything. It's only when it references a QEffect node that a QMaterial becomes useful.

In practice, it often happens that a single QEffect is being referenced by several QMaterial components. This allows to only create the effect, techniques, passes and shaders once while allowing to specify the material by adding QParameter instances.

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

     QMaterial *material1 = new QMaterial();
     QMaterial *material2 = new QMaterial();

     // Create effect, technique, render pass and shader
     QEffect *effect = new QEffect();
     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);

     // Set the effect on the materials
     material1->setEffect(effect);
     material2->setEffect(effect);

     // Set different parameters on the materials
     const QString parameterName = QStringLiteral("color");
     material1->addParameter(new QParameter(parameterName, QColor::fromRgbF(0.0f, 1.0f, 0.0f, 1.0f);
     material2->addParameter(new QParameter(parameterName, QColor::fromRgbF(1.0f, 1.0f, 1.0f, 1.0f);

See also QEffect, QTechnique, and QParameter.

## Property Documentation

### effect : Qt3DRender::QEffect*

Specifies the effect to be used with the material.

Access functions:

QEffect * | effect() const
void | setEffect(QEffect *effect)

Notifier signal:

void | effectChanged(QEffect *effect)

## Member Function Documentation

### void QMaterial::addParameter(QParameter *parameter)

Add a parameter to the material's parameters.

### QVector<QParameter *> QMaterial::parameters() const

Returns a vector of the material's current parameters

### void QMaterial::removeParameter(QParameter *parameter)

Remove a parameter from the material's parameters.