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To add the Hair Properties, select the curve or points and click the Hair Properties button residing in the V-Ray shelf. This creates a V-Ray tab to the object's properties menu.
For more information on the hair properties under V-Ray Object Properties SOP, see the V-Ray Object Properties SOP page.
UI Paths:
||Select object(s)|| > V-Ray Shelf > Hair Props (with the curve/points selected) > V-Ray tab > Hair tab
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