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Mesh Mesh Edit Tools > Collapse > Reduce Vertex Count 
The ReduceMesh command decreases the polygon mesh face count while minimizing geometric and texture distortion.
Reduce Mesh Options
The number of triangle polygons. Every quadrangle face is counted as two triangle polygons.
Specifies the desired number of polygons.
Specifies reduction by a percentage of the starting polygon count.
Restricts reduction to planar polygons.
Reduce mesh command lets you lock mesh points. Reduction will not alter those points.
Highlights locked mesh points.
Adds selected mesh points into the set of locked mesh points.
You can use SelBrush to select and deselect points to add.
Removes selected from the set of locked mesh points.
Undoes previous operations.
Add mesh points on naked mesh edges into the set of locked mesh points.
Displays a preview of the output.
If you change the settings, click the
button again to refresh the display.Commandline options  

Accuracy 
1=FastTrades accuracy for speed during conversion. Reduction is performed more randomly, involving fewer calculations, and is therefore faster. 10=AccurateProduces the fewest visible artifacts. This involves more calculations and is therefore slower. Note: This option does not affect the dialog version. The dialog version always uses 10 for max accuracy. 
Rhinoceros 6 © 20102017 Robert McNeel & Associates. 10Dec2018