ObjectSnapMode

These can be combinations, so use 1,2,4, 8,16, etc.

SnapCenter

SnapNear

SnapEnd

SnapMid

SnapNode

SnapQuick

SnapQuadrant

SnapTangent

SnapPerpendicular

SnapNear

SnapInsertionPoint

SnapPoint

SnapIntersection

SnapPlanViewIntersection