Purpose

The module IsoSurface generates a WEM-based iso surface.

The macro has an Open Inventor output and an additional WEM output. The latter can be used for tuning the rendering in a more sophisticated way, while the first one suffices in the most cases.

A LUT can be applied that takes an effect on the Open Inventor output if the according coloring mode is chosen.

Details

The macro comprises a WEMIsoSurface a WEMSmooth and a SoWEMRenderer module in this order in a pipeline.

An additional WEMReducePolygons module is used if the Polygon Reduction option is checked.

Windows

Default Panel

../../../Modules/Macros/IsoSurface/mhelp/Images/Screenshots/IsoSurface._default.png

Input Fields

inImage

name: inImage, type: Image

inLUT

name: inLUT, type: LUTFunction(MLBase)

Output Fields

outScene

name: outScene, type: SoNode

outWEM

name: outWEM, type: WEM(MLBase)
For accessing this object via scripting see the Scripting Reference: MLWEMWrapper.

Parameter Fields

Field Index

Factor: Float Use Smoothing: Bool
Iso Value: Double  
Num. Passes: Integer  
progress: Float  
Resolution: Integer  
Target Reduction: Integer  
Use Interpolation: Bool  
Use reduction: Bool  

Visible Fields

Iso Value

name: isoValue, type: Double, default: 400

Sets the iso-value.

A WEM face is generated between a pair of voxels where one voxel’s value is greater than or equal to this value, and the other voxel’s value is less.

Resolution

name: quality, type: Integer, default: 3, minimum: 1, maximum: 12

Sets the resolution value. This value is the stride size with which the image voxels are scanned.

Use Interpolation

name: useInterpolation, type: Bool, default: TRUE

If checked, a linear interpolation of the generated node positions is applied based on the image values.

Use Smoothing

name: useSmoothing, type: Bool, default: FALSE

If checked, the generated surface is smoothed by using a Laplacian smoothing.

Num. Passes

name: smoothingPasses, type: Integer, default: 5, minimum: 0, maximum: 200

Sets the number of Laplacian smoothing passes.

Factor

name: smoothingFactor, type: Float, default: 0.2, minimum: 0, maximum: 1

Sets the smoothing factor for the Laplacian smoothing.

Use reduction

name: usePolygonReduction, type: Bool, default: FALSE

If checked, the generated surface mesh is reduced in the number of triangles.

This is done by a remeshing scheme that attempts to leave the overall geometry and shape as close to the original as possible.

Target Reduction

name: targetReduction, type: Integer, default: 70, minimum: 10, maximum: 98

Sets the percentage of target triangles for the reduction.

The default of 70 means that the resulting mesh consists of only 70% of the original triangles.

Hidden Fields

progress

name: progress, type: Float, persistent: no