VCG Ridge Line

Description

The RidgeLine filter computes ridge lines of point (node) data. This filter operates on unstructured grid data and produces geometry output.

Details

Extracts ridgelines.

Input

vtkUnstructuredGrid

Output

Polygonal Mesh

Parameters

Name
Description
Values/Default
Variant Non-planar faces are either decomposed into triangles and the intersections with the core lines are determined directly, or the intersections with the non-planar faces are determined using Newton iterations.
  • triangle
  • quad Newton
SmoothingRange Smoothing range for gradient computation. 1
ExplicitEigenvectors If enabled, eigenvectors are computed explicitly (recommended!). 1
ScalarMin Minimum scalar value. Segments with lower scalar value will be discarded. 0.0
HessExtrEigenvalMin Minimum absolute value of second derivative across ridge (used for suppressing flat ridges). 0.0
PCAsubdomMaxPerc The second largest absolute eigenvalue must not be larger than this percentage of the largest absolute eigenvalue. 0.0
MinimumNumberOfVertices Core line segments with fewer vertices than this parameter will be discared. 10
MaximumNumberOfExceptions Core line segments with more exceptions than this parameter will be discared. 3
MinStrength The minimal required ridge strength. Segments with lower strength will be discarded. 1.0
MaxAngle The maximal allowed angle between the vector and the core line tangent. Segments with larger angle will be discarded. 30.0

Installation Instructions

Authors

Martin Roth, Ronald Peikert, Filip Sadlo, Kai Sdeo, Philip Hausner

Available Files

[BibTeX]

Acknowledgements