I tested that (with some image as heightfield) and didn't see any difference
between clipping it or not (clipping didn't make anything disappear).
  And by the way, you should clip the object which is infinite, this being the
first difference.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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