public delegate void TriangleCB(
	SoCallbackAction action,
	out SoPrimitiveVertex v1,
	out SoPrimitiveVertex v2,
	out SoPrimitiveVertex v3
)

Public Delegate Sub TriangleCB ( 
	action As SoCallbackAction,
	<OutAttribute> ByRef v1 As SoPrimitiveVertex,
	<OutAttribute> ByRef v2 As SoPrimitiveVertex,
	<OutAttribute> ByRef v3 As SoPrimitiveVertex
)

public delegate void TriangleCB(
	SoCallbackAction^ action, 
	[InAttribute] [OutAttribute] SoPrimitiveVertex% v1, 
	[InAttribute] [OutAttribute] SoPrimitiveVertex% v2, 
	[InAttribute] [OutAttribute] SoPrimitiveVertex% v3
)

type TriangleCB = 
    delegate of 
        action : SoCallbackAction * 
        v1 : SoPrimitiveVertex byref * 
        v2 : SoPrimitiveVertex byref * 
        v3 : SoPrimitiveVertex byref -> unit