Computing Curvatures

Kindly I’m trying to compute the curvatures (principal, mean, gaussion) of the vertices in my mesh, specifically for special vertices not the whole vertices, is it possible? I checked this function addCurvatureScalars but I believe it didn’t worked like what I want, since it retrieve like this:

vtkFollower (0x55a39080f070)
  Debug: Off
  Modified Time: 721
  Reference Count: 1
  Registered Events: (none)
  Dragable: On
  Pickable: On
  AllocatedRenderTime: 10
  EstimatedRenderTime: 0
  NumberOfConsumers: 0
  RenderTimeMultiplier: 1
  Visibility: On
  PropertyKeys: none.
  useBounds: 1
  IsIdentity: true
  Position: (0, 0, 0)
  Orientation: (0, 0, 0)
  Origin: (0, 0, 0)
  Scale: (1, 1, 1)
  Bounds: 
    Xmin,Xmax: (-0.611773, 0.864326)
    Ymin,Ymax: (-0.200548, 0.448087)
    Zmin,Zmax: (-0.238711, 0.345187)
  UserTransform: (none)
  UserMatrix: (none)
  Mapper:
    Debug: Off
    Modified Time: 644
    Reference Count: 3
    Registered Events: (none)
    Executive: 0x55a39076adf0
    ErrorCode: Success
    Information: 0x55a39098ea20
    AbortExecute: Off
    Progress: 1
    Progress Text: (None)
    TimeToDraw: 0.0001
    ClippingPlanes: (none)
    Lookup Table: (none)
    Scalar Visibility: On
    Static: Off
    Scalar Range: (0, 0)
    UseLookupTableScalarRange: 0
    Color Mode: Default
    InterpolateScalarsBeforeMapping: On
    Scalar Mode: UseCellData
    RenderTime: 0
    Resolve Coincident Topology: Off
    CoincidentPointOffset: 0
    CoincidentLineOffset: 0
    CoincidentPolygonOffset: 0
    CoincidentLineFactor: 0
    CoincidentPolygonFactor: 0
    Piece : 0
    NumberOfPieces : 1
    GhostLevel: 0
    Number of sub pieces: 1
  Property:
    Debug: Off
    Modified Time: 384
    Reference Count: 1
    Registered Events: (none)
    Ambient: 0
    Ambient Color: (1, 1, 1)
    Diffuse: 1
    Diffuse Color: (1, 1, 1)
    Edge Color: (0, 0, 0)
    Edge Visibility: Off
    Vertex Color: (0.5, 1, 0.5)
    Vertex Visibility: Off
    Interpolation: VTK_PHONG
    Opacity: 1
    Representation: VTK_SURFACE
    Specular: 0
    Specular Color: (1, 1, 1)
    Specular Power: 1
    Backface Culling: Off
    Frontface Culling: Off
    Point size: 1
    Line width: 1
    Line stipple pattern: 65535
    Line stipple repeat factor: 1
    Lighting: On
    RenderPointsAsSpheres: On
    RenderLinesAsTubes: Off
    Shading: Off
    MaterialName: (none)
    Color: (1, 1, 1)
    EmissiveFactor: (1, 1, 1)
    NormalScale: 1
    OcclusionStrength: 1
    Metallic: 0
    Roughness: 0.5
  BackfaceProperty: (none)
  Texture: (none)
  ForceOpaque: false
  ForceTranslucent: false
  Camera: (none)

And if it’s for each vertex, what are the formulas you are following for the calculation.

Thank you.

[marcomusy]

that’s shown in the printout…

from vedo import *

elli = Ellipsoid()

m = 3
modes = {0:"Gauss_Curvature",
         1:"Mean_Curvature",
         2:"Maximum_Curvature",
         3:"Minimum_Curvature"}

elli.addCurvatureScalars(m).cmap('coolwarm', modes[m]).printInfo()

print(elli.getPointArray(modes[m]))

show(elli, axes=1)

[marcomusy]

You mean I have to retrieve all, then the desired ones!

Yes, that’s correct. It might seem over-killing but it’s actually not: numpy takes care of that.