events - Why does collision work properly for convex polygon based physicsBody but touchesMoved doesn't -

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i setup sksprite (s1) have physicsbody polygon path: 

s1.physicsbody = [skphysicsbody bodywithpolygonfrompath:path];

and other 1 (s2) has physicsbody generated surrounding rectangle: 

s2.physicsbody = [skphysicsbody bodywithrectangleofsize:e.size];

and collisions of 2 sprites fine, happen when actual pixels s1's polygon path , surrounding rectangle s2 collide (and not surrounding rectangles each of sprites). fine. touchesmoved in s1 - has polygon based body - occurs when surrounding rectangle touched - though has polygon based physicsbody (see above code setting physicsbody of s1). how can solve problem , have event fire when should, when actual pixels (defined polygon based physicsbody) touched?

i tried detecting body @ point: 

skphysicsbody * draggedoverbody = [self.physicsworld bodyatpoint:location];  draggedovernode = draggedoverbody.node;

and detects bounding rectangle instead of polkygon physicsbody. frustrating.


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