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GetTessellationQuality Method (IModelDoc2)

Gets the shaded-display image quality number for the current document.

.NET Syntax

Visual Basic (Declaration) 
Function GetTessellationQuality() As System.Integer
Visual Basic (Usage) 
Dim instance As IModelDoc2
Dim value As System.Integer
value = instance.GetTessellationQuality()
System.int GetTessellationQuality()
System.int GetTessellationQuality(); 

Return Value

0 < Shaded-display image quality number < 106 (see Remarks)


This method returns a number (QualityNum) that corresponds to the degree of tessellation of curved surfaces for shaded rendering output. Tools > Options > Document Properties > Image Quality includes a field that sets the maximum chordal deviation. QualityNum and the maximum chordal deviation (in meters) are coupled and inversely proportional as follows:

var = TessMin + QualityNum*((TessMax-TessMin)/100)

Deviation = 0.025 * (BodyDiameter * 2) / var


  • TessMin = 6
  • TessMax = 166
  • 0 < QualityNum (returned by this method) < 106
  • BodyDiameter is the diagonal distance across the bounds of the part box. See IPartDoc::GetPartBox or IPartDoc::IGetPartBox for more information.

You can also get the maximum chordal deviation using swUserPreferencesDouble_e.swImageQualityShadedDeviation.

To get the image quality number, use swUserPreferenceInteger_e.swImageQualityShaded.

NOTE: Setting the degree of tessellation to a higher value results in:

  • finer tessellation,
  • increased file size,
  • slower graphics performance, and
  • increased memory usage.



See Also


SOLIDWORKS 2001Plus FCS, Revision Number 10.0

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