SceneWidget: 3D data viewer widget

This module provides a widget to view data sets in 3D.

For sample code using SceneWidget, see plot3dSceneWindow.py in silx.gui.plot3d sample code.

SceneWidget

class SceneWidget(parent=None)

Bases: silx.gui.plot3d.Plot3DWidget.Plot3DWidget

Widget displaying data sets in 3D

model()

Returns the model corresponding the scene of this widget

Return type:SceneModel

selection()

Returns the object managing selection in the scene

Return type:SceneSelection

getSceneGroup()

Returns the root group of the scene

Return type:GroupItem

pickItems(x, y, condition=None)

Iterator over picked items in the scene at given position.

Each picked item yield a PickingResult object holding the picking information.

It traverses the scene tree in a left-to-right top-down way.

Parameters:

• x (int) – X widget coordinate
• y (int) – Y widget coordinate
• condition (callable) – Optional test called for each item checking whether to process it or not.

setInteractiveMode(mode)

Set the interactive mode.

‘panSelectedPlane’ mode set plane panning if a plane is selected, otherwise it fall backs to ‘rotate’.

Parameters:mode (str) – The interactive mode: ‘rotate’, ‘pan’, ‘panSelectedPlane’ or None

getInteractiveMode()

Returns the interactive mode in use.

Return type:str

add3DScalarField(data, copy=True, index=None)

Add 3D scalar data volume to SceneWidget content.

Dataset order is zyx (i.e., first dimension is z).

Parameters:

• data (3D numpy.ndarray of float32 with shape at least (2, 2, 2)) – 3D array
• copy (bool) – True (default) to make a copy, False to avoid copy (DO NOT MODIFY data afterwards)
• index (int) – The index at which to place the item. By default it is appended to the end of the list.

Returns:

The newly created scalar volume item

Return type:

ScalarField3D

add3DScatter(x, y, z, value, copy=True, index=None)

Add 3D scatter data to SceneWidget content.

Parameters:

• x (numpy.ndarray) – Array of X coordinates (single value not accepted)
• y – Points Y coordinate (array-like or single value)
• z – Points Z coordinate (array-like or single value)
• value – Points values (array-like or single value)
• copy (bool) – True (default) to copy the data, False to use provided data (do not modify!)
• index (int) – The index at which to place the item. By default it is appended to the end of the list.

Returns:

The newly created 3D scatter item

Return type:

Scatter3D

add2DScatter(x, y, value, copy=True, index=None)

Add 2D scatter data to SceneWidget content.

Provided arrays must have the same length.

Parameters:

• x (numpy.ndarray) – X coordinates (array-like)
• y (numpy.ndarray) – Y coordinates (array-like)
• value – Points value: array-like or single scalar
• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).
• index (int) – The index at which to place the item. By default it is appended to the end of the list.

Returns:

The newly created 2D scatter item

Return type:

Scatter2D

addImage(data, copy=True, index=None)

Add a 2D data or RGB(A) image to SceneWidget content.

2D data is casted to float32. RGBA supported formats are: float32 in [0, 1] and uint8.

Parameters:

• data (numpy.ndarray) – Image as a 2D data array or RGBA image as a 3D array (height, width, channels)
• copy (bool) – True (default) to copy the data, False to use as is (do not modify!).
• index (int) – The index at which to place the item. By default it is appended to the end of the list.

Returns:

The newly created image item

Return type:

ImageData or ImageRgba

Raises:

ValueError – For arrays of unsupported dimensions

addItem(item, index=None)

Add an item to SceneWidget content

Parameters:

• item (Item3D) – The item to add
• index (int) – The index at which to place the item. By default it is appended to the end of the list.

Raises:

ValueError – If the item is already in the SceneWidget.

removeItem(item)

Remove an item from SceneWidget content.

Parameters:item (Item3D) – The item to remove from the scene Raises:ValueError – If the item does not belong to the group

getItems()

Returns the list of SceneWidget items.

Only items in the top-level group are returned.

Return type:tuple

clearItems()

Remove all item from SceneWidget.

getTextColor()

Return color used for text

Return type:QColor

setTextColor(color)

Set the text color.

Parameters:color (QColor, str or array-like of 3 or 4 float in [0., 1.] or uint8) – RGB color: name, #RRGGBB or RGB values

getForegroundColor()

Return color used for bounding box

Return type:QColor

setForegroundColor(color)

Set the foreground color.

Parameters:color (QColor, str or array-like of 3 or 4 float in [0., 1.] or uint8) – RGB color: name, #RRGGBB or RGB values

getHighlightColor()

Return color used for highlighted item bounding box

Return type:QColor

setHighlightColor(color)

Set highlighted item color.

Parameters:color (QColor, str or array-like of 3 or 4 float in [0., 1.] or uint8) – RGB color: name, #RRGGBB or RGB values

SceneWidget items

• items: SceneWidget items
  • 2D images
  • 2D/3D scatter data
  • 3D volume
  • Clipping plane
  • 3D mesh
  • Item base classes

PickingResult

class PickingResult(item, positions, indices=None, fetchdata=None)

Class to access picking information in a 3D scene.

getItem()

Returns the item this results corresponds to.

Return type:Item3D

getIndices(copy=True)

Returns indices of picked data.

If data is 1D, it returns a numpy.ndarray, otherwise it returns a tuple with as many numpy.ndarray as there are dimensions in the data.

Parameters:copy (bool) – True (default) to get a copy, False to return internal arrays Return type:Union[None,numpy.ndarray,List[numpy.ndarray]]

getData(copy=True)

Returns picked data values

Parameters:copy (bool) – True (default) to get a copy, False to return internal arrays Return type:Union[None,numpy.ndarray]

getPositions(frame='scene', copy=True)

Returns picking positions in item coordinates.

Parameters:

• frame (str) – The frame in which the positions are returned Either ‘scene’ for world space, ‘ndc’ for normalized device coordinates or ‘object’ for item frame.
• copy (bool) – True (default) to get a copy, False to return internal arrays

Returns:

Nx3 array of (x, y, z) coordinates

Return type:

numpy.ndarray