WEMLevelSetBoolean¶

MLModule¶

author	`MeVis Medical Solutions AG`
package	`MeVisLab/Standard`
dll	`MLOpenVDB`
definition	MLOpenVDB.def
inherits from	`WEMLevelSetFilterBase`
keywords	`difference`, `intersection`, `union`

Purpose¶

The WEMLevelSetBoolean module allows for performing boolean operations on WEM meshes using a discrete level set representation.

It utilizes the OpenVDB library.

Note: For optimal results, it is important to select an adequate Grid Cell Size; otherwise, the resolution of the grid can be either too high or too low to generate satisfactory results. If the meshes have been generated by, for example, WEMIsoSurface, the grid size should be close to the smallest voxel size of the dataset.

Typically, you should disable auto-update, as the module will calculate the output too frequently when both meshes change, which is a common scenario.

Windows¶

Default Panel¶

../../../Projects/MLOpenVDB/MLOpenVDB/Modules/mhelp/Images/Screenshots/WEMLevelSetBoolean._default.png

Parameter Fields¶

Field Index¶

`Adaptivity`: `Double`	`Grid Cell Size`: `Double`	`Mode`: `Enum`
`Apply`: `Trigger`	`id`: `Integer`	`Overwrite label and description`: `Bool`
`Auto Apply`: `Bool`	`Interpolate per node PVLs`: `Bool`	`progress`: `Float`
`Build Edges`: `Bool`	`isProcessing`: `Bool`	`shouldComputeNormals`: `Bool`
`Clear`: `Trigger`	`Label`: `String`	`triangulationMode`: `Enum`
`Description`: `String`	`listenToFinishNotifications`: `Bool`	`Update Mode`: `Enum`
`elapsedTime`: `Float`	`listenToRepaintNotifications`: `Bool`	`workDirectlyOnInputWEMs`: `Bool`
`Enable PVL support`: `Bool`	`listenToSelectionChangedNotifications`: `Bool`

Visible Fields¶

Auto Apply¶

name: autoApply, type: Bool, default: TRUE¶

see WEMGenerator.autoApply

Update Mode¶

name: updateMode, type: Enum, default: AutoUpdate, deprecated name: autoUpdate¶

see WEMGenerator.updateMode

Apply¶

name: apply, type: Trigger¶

see WEMGenerator.apply

Clear¶

name: clear, type: Trigger¶: Clears the output WEM.

Overwrite label and description¶

name: overwriteLabelDescription, type: Bool, default: FALSE¶

see WEMGenerator.overwriteLabelDescription

Label¶

name: label, type: String¶

see WEMGenerator.label

Description¶

name: description, type: String¶

see WEMGenerator.description

Grid Cell Size¶

name: gridCellSize, type: Double, default: 1¶

Sets the level set grid size in millimeters.

This parameter is important and must match the resolution of the input WEMs to produce optimal results.

Adaptivity¶

name: adaptivity, type: Double, default: 0.2¶

Sets the adaptivity of the resulting mesh.

An adaptivity value of 0 means that all triangles are created at the highest resolution, while an adaptivity value of 1 reduces the mesh to the maximum supported by OpenVDB.

Build Edges¶

name: buildEdges, type: Bool, default: TRUE¶: If checked, the building of edge connectivity for the WEM is enabled.

Enable PVL support¶

name: enablePVLSupport, type: Bool, default: FALSE¶

see WEMLevelSetFilterBase.enablePVLSupport

Interpolate per node PVLs¶

name: interpolatePerNodePVLs, type: Bool, default: FALSE¶

see WEMLevelSetFilterBase.interpolatePerNodePVLs

Mode¶

name: mode, type: Enum, default: Union¶: Defines which boolean operation is used.

Values:

Title	Name	Description
Intersection	Intersection	Intersects the two input WEMs.
Union	Union	Creates the union of the two input WEMs.
Difference	Difference	Subtracts the second input WEM from the first.