Class: QgsMesh3DDataBlock

A block of 3d stacked mesh data related N faces defined on base mesh frame.

Data are implicitly shared, so the class can be quickly copied std.numeric_limits<double>.quiet_NaN() represents NODATA value

Note

The API is considered EXPERIMENTAL and can be changed without a notice

Note

In QGIS 3.34 this class was renamed from QgsMesh3dDataBlock to QgsMesh3DDataBlock. The old QgsMesh3dDataBlock name remains available in PyQGIS for compatibility.

Added in version 3.12.

Methods

count	Number of 2d faces for which the volume data is stored in the block
faceToVolumeIndex	Returns the indexing between faces and volumes
firstVolumeIndex	Index of the first volume stored in the buffer (absolute)
isValid	Whether the block is valid
isVector	Whether we store vector values
lastVolumeIndex	Index of the last volume stored in the buffer (absolute)
setFaceToVolumeIndex	Sets the indexing between faces and volumes
setValid	Sets block validity
setValues	Sets the values at volume centers
setVerticalLevels	Sets the vertical levels height
setVerticalLevelsCount	Sets the vertical level counts
value	Returns the value at volume centers
values	Returns the values at volume centers
verticalLevels	Returns the vertical levels height
verticalLevelsCount	Returns number of vertical level above 2d faces
volumesCount	Returns number of volumes stored in the buffer

class qgis.core.QgsMesh3DDataBlock

Bases: object

__init__()

Constructs an invalid block

__init__(count: int, isVector: bool)

Constructs a new block for count faces

Parameters:

• count (int)

• isVector (bool)

__init__(a0: QgsMesh3DDataBlock)

Parameters:

a0 (QgsMesh3DDataBlock)

count(self) → int

Number of 2d faces for which the volume data is stored in the block

Return type:

int

faceToVolumeIndex(self) → List[int]

Returns the indexing between faces and volumes

Return type:

List[int]

firstVolumeIndex(self) → int

Index of the first volume stored in the buffer (absolute)

Return type:

int

isValid(self) → bool

Whether the block is valid

Return type:

bool

isVector(self) → bool

Whether we store vector values

Return type:

bool

lastVolumeIndex(self) → int

Index of the last volume stored in the buffer (absolute)

Return type:

int

setFaceToVolumeIndex(self, faceToVolumeIndex: Iterable[int])

Sets the indexing between faces and volumes

Parameters:

faceToVolumeIndex (Iterable[int])

setValid(self, valid: bool)

Sets block validity

Parameters:

valid (bool)

setValues(self, doubleBuffer: Iterable[float])

Sets the values at volume centers

For vector datasets the number of values is doubled (x1, y1, x2, y2, … )

Parameters:

doubleBuffer (Iterable[float])

setVerticalLevels(self, verticalLevels: Iterable[float])

Sets the vertical levels height

Parameters:

verticalLevels (Iterable[float])

setVerticalLevelsCount(self, verticalLevelsCount: Iterable[int])

Sets the vertical level counts

Parameters:

verticalLevelsCount (Iterable[int])

value(self, volumeIndex: int) → QgsMeshDatasetValue

Returns the value at volume centers

Parameters:

volumeIndex (int) – volume index relative to firstVolumeIndex()

Return type:

QgsMeshDatasetValue

Returns:

value (scalar or vector)

values(self) → List[float]

Returns the values at volume centers

For vector datasets the number of values is doubled (x1, y1, x2, y2, … )

Return type:

List[float]

verticalLevels(self) → List[float]

Returns the vertical levels height

Return type:

List[float]

verticalLevelsCount(self) → List[int]

Returns number of vertical level above 2d faces

Return type:

List[int]

volumesCount(self) → int

Returns number of volumes stored in the buffer

Return type:

int