Dear Everybode, and mostly @stevebaer I would love to write a custom CurvatureAnalysis Version. There is a nice example how to inherit VisualAnalysisMode: [image] Visual Analysis Modes Demonstrates how to set the visual analysis mode to Z analysis for user-specified objects. …

Hi @Tom_P , There is another sample you might want to review. SampleCsZAnalysis.cs Rhino object know how to draw themselves. When a Rhino object is assigned a visual analysis mode, it call the mode’s UpdateVertexColors override, when needed, to calculate false colors required to draw a mesh. The …

Dear Dale - thanks for your answer. Where i am stuck is the parameters of UpdateVertexColors UpdateVertexColors(Rhino.DocObjects.RhinoObject obj, Mesh[] meshes) Both examples use the Mesh-Vertex-Z-Values to update the VertexColor - But for example if i want to query the curvature - the informatio…

Hi @Tom_P , It appears there are a few things missing in RhinoCommon to make this easier. For one, the analysis meshes attached to Rhino surface and polysurfaces can contain surface curvature information ( ON_Mesh::m_K ). And this isn’t exposed in RhinoCommon. Having access to this would be a good sta…

VisualAnalysisMode Draw-Methods vs UpdateVertexColors

Rhino Developer

brian (Brian Gillespie) May 12, 2026, 11:11pm 6

RH-51405 is fixed in Rhino WIP

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VisualAnalysisMode Draw-Methods vs UpdateVertexColors

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