Well, you are telling POV-Ray "there's a triangle here" and thus POV-Ray
renders the triangle. If you don't want a triangle there, then don't put
a triangle there.

  In order to use the merge CSG, each box has to be a separate (solid) object
(meshes can be made solid with the inside_vector feature). If you are going
to use only boxes, then real boxes instead of meshes will probably be
more efficient for this.
  If you define one single mesh, then it's one single object. There's no
way POV-Ray can perform a "merge" to one single object.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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