i was rotating the mesh after id posted that pic and id noticed that it looks as though the displacement had punched holes in the mesh and i that i could see the luminous portion of the back of the mesh if you get me, i could understand if i had put huge amount on the displacement amount but its reatively minor.

thankyou very much for your assistance though, if i ever get to the bottom of this i will let you know :-)

 A cleaved head no longer plots.

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