QSGGeometryNode

The QSGGeometryNode class is used for all rendered content in the scene graph. More

Inheritance diagram of PySide6.QtQuick.QSGGeometryNode

Inherited by: QSGSimpleTextureNode, QSGSimpleRectNode, QSGRectangleNode

Synopsis

Functions

Detailed Description

The QSGGeometryNode consists of geometry and material. The geometry defines the mesh, the vertices and their structure, to be drawn. The Material defines how the shape is filled.

The following is a code snippet illustrating how to create a red line using a QSGGeometryNode :

QSGGeometry *geometry = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
geometry->setDrawingMode(GL_LINES);
geometry->setLineWidth(3);
geometry->vertexDataAsPoint2D()[0].set(0, 0);
geometry->vertexDataAsPoint2D()[1].set(width(), height());

QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
material->setColor(QColor(255, 0, 0));

QSGGeometryNode *node = new QSGGeometryNode;
node->setGeometry(geometry);
node->setFlag(QSGNode::OwnsGeometry);
node->setMaterial(material);
node->setFlag(QSGNode::OwnsMaterial);

A geometry node must have both geometry and a normal material before it is added to the scene graph. When the geometry and materials are changed after the node has been added to the scene graph, the user should also mark them as dirty using markDirty() .

The geometry node supports two types of materials, the opaqueMaterial and the normal material. The opaqueMaterial is used when the accumulated scene graph opacity at the time of rendering is 1. The primary use case is to special case opaque rendering to avoid an extra operation in the fragment shader can have significant performance impact on embedded graphics chips. The opaque material is optional.

Note

All classes with QSG prefix should be used solely on the scene graph’s rendering thread. See Scene Graph and Rendering for more information.

class PySide6.QtQuick.QSGGeometryNode

Creates a new geometry node without geometry and material.

PySide6.QtQuick.QSGGeometryNode.activeMaterial()
Return type

PySide6.QtQuick.QSGMaterial

PySide6.QtQuick.QSGGeometryNode.inheritedOpacity()
Return type

float

PySide6.QtQuick.QSGGeometryNode.material()
Return type

PySide6.QtQuick.QSGMaterial

Returns the material of the QSGGeometryNode .

See also

setMaterial()

PySide6.QtQuick.QSGGeometryNode.opaqueMaterial()
Return type

PySide6.QtQuick.QSGMaterial

Returns the opaque material of the QSGGeometryNode .

PySide6.QtQuick.QSGGeometryNode.renderOrder()
Return type

int

PySide6.QtQuick.QSGGeometryNode.setInheritedOpacity(opacity)
Parameters

opacity – float

PySide6.QtQuick.QSGGeometryNode.setMaterial(material)
Parameters

materialPySide6.QtQuick.QSGMaterial

Sets the material of this geometry node to material.

Geometry nodes must have a material before they can be added to the scene graph.

If the material is changed without calling again, the user must also mark the material as dirty using markDirty() .

See also

material()

PySide6.QtQuick.QSGGeometryNode.setOpaqueMaterial(material)
Parameters

materialPySide6.QtQuick.QSGMaterial

Sets the opaque material of this geometry to material.

The opaque material will be preferred by the renderer over the default material, as returned by the material() function, if it is not null and the geometry item has an inherited opacity of 1.

The opaqueness refers to scene graph opacity, the material is still allowed to set Blending to true and draw transparent pixels.

If the material is changed without calling again, the user must also mark the opaque material as dirty using markDirty() .

See also

opaqueMaterial()

PySide6.QtQuick.QSGGeometryNode.setRenderOrder(order)
Parameters

order – int