- Qt 6.9
- Qt Data Visualization
- QML Types
- Custom3DItem
- Qt Data Visualization | Commercial or GPLv3

# Custom3DItem QML Type

Adds a custom item to a graph. More...

Import Statement: | `import QtDataVisualization 1.9`
Since: | QtDataVisualization 1.1
Inherited By: | Custom3DLabel and Custom3DVolume

- List of all members, including inherited members

## Properties

- meshFile : string
- position : vector3d
- positionAbsolute : bool
- rotation : quaternion
- scaling : vector3d
- scalingAbsolute : bool `(since QtDataVisualization 1.2)`
- shadowCasting : bool
- textureFile : string
- visible : bool

## Methods

- void setRotationAxisAndAngle(vector3d axis, real angle)

## Detailed Description

A custom item has a custom mesh, position, scaling, rotation, and an optional texture.

## Property Documentation

meshFile : string

The item mesh file name. The item in the file must be in Wavefront OBJ format and include vertices, normals, and UVs. It also needs to be in triangles. If the file is missing either normals or UVs, loading will fail with an error message to the console output and the item will not be rendered.

position : vector3d

The item position as a vector3d type. Defaults to `vector3d(0.0, 0.0, 0.0)`.

Item position is specified either in data coordinates or in absolute coordinates, depending on the value of the positionAbsolute property. When using absolute coordinates, values between `-1.0...1.0` are within axis ranges.

Note: Items positioned outside any axis range are not rendered if positionAbsolute is `false`, unless the item is a Custom3DVolume that would be partially visible and scalingAbsolute is also `false`. In that case, the visible portion of the volume will be rendered.

See also positionAbsolute and scalingAbsolute.

positionAbsolute : bool

Defines whether item position is to be handled in data coordinates or in absolute coordinates. Defaults to `false`. Items with absolute coordinates will always be rendered, whereas items with data coordinates are only rendered if they are within axis ranges.

See also position.

rotation : quaternion

The item rotation as a quaternion. Defaults to `quaternion(0.0, 0.0, 0.0, 0.0)`.

scaling : vector3d

The item scaling as a vector3d type. Defaults to `vector3d(0.1, 0.1, 0.1)`.

Item scaling is specified either in data values or in absolute values, depending on the value of the scalingAbsolute property. The default vector interpreted as absolute values sets the item to 10% of the height of the graph, provided the item mesh is normalized and the graph aspect ratios have not been changed from the defaults.

See also scalingAbsolute.

scalingAbsolute : bool `[since QtDataVisualization 1.2]`

Defines whether item scaling is to be handled in data values or in absolute values. Defaults to `true`. Items with absolute scaling will be rendered at the same size, regardless of axis ranges. Items with data scaling will change their apparent size according to the axis ranges. If positionAbsolute is `true`, this property is ignored and scaling is interpreted as an absolute value. If the item has rotation, the data scaling is calculated on the unrotated item. Similarly, for Custom3DVolume items, the range clipping is calculated on the unrotated item.

Note: Only absolute scaling is supported for Custom3DLabel items or for custom items used in polar graphs.

Note: The custom item's mesh must be normalized to the range `[-1 ,1]`, or the data scaling will not be accurate.

This property was introduced in QtDataVisualization 1.2.

See also scaling and positionAbsolute.

shadowCasting : bool

Defines whether shadow casting for the item is enabled. Defaults to `true`. If `false`, the item does not cast shadows regardless of ShadowQuality.

textureFile : string

The texture file name for the item. If left unset, a solid gray texture will be used.

Note: To conserve memory, the QImage loaded from the file is cleared after a texture is created.

visible : bool

The visibility of the item. Defaults to `true`.

## Method Documentation

void setRotationAxisAndAngle(vector3d axis, real angle)

A convenience function to construct the rotation quaternion from axis and angle.

See also rotation.