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 to do boolean operations on WEM meshes using a discrete level set representation. It makes use of the OpenVDB (http://www.openvdb.org/) library.

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

Typically you should turn auto-update off, since the module will calculate the output too often when both meshes change, which is a typical 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¶: Defines the level set grid size in millimeters. This parameter is important and needs to match the resolution of the input WEMs to produce good results.

Adaptivity¶

name: adaptivity, type: Double, default: 0.2¶: Defines the adaptivity of the resulting mesh. Adaptivity == 0 means that all triangles are created at the highest resolution, while adaptivity == 1 reduces the mesh to the maximum that is supported by OpenVDB.

Build Edges¶

name: buildEdges, type: Bool, default: TRUE¶: Enables building of the edge connectivity of WEM.

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 from the first.