Alex Falappa <afa### [at] remove-medatamatit> wrote:
: I use Windows, which when +UA is on makes the checkered background of the
: preview window visible trough the transparent pixels of the image.

  As an anecdotical (and perhaps historical?) note: The idea of making the
preview window support the alpha channel using a white-grey-checkered
background was first implemented in the unix-version of POV-Ray. Only after
it resulted to be a superb idea it was implemented in the Windows version
as well.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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