make an quad point to camera blitz3d

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Wings

Hi

I have a problem with my own tree system
i am going to create a single surface leaf. instead of sprite i use Quads aka 2 triangles merged to a rectangle freemoving.

problem i have i have no idea how to make the quad always point at camera. i cant use turn entity cause there is not entity for each leaf.

Type Leaf
Field surface
field x#,y#,z#
field vert1
field vert2
field vert3
field vert4
end type

now how do i make it point to camera :(