John David Haiducek <jha### [at] enginumichedu> wrote:
: Someone said that the output_alpha=on is supposed to render the scene so
: the background color doesn't influence the scene.

  Not really. What happens with +ua is that the background color has no
effect on antialiased pixels as well as (semi)transparent objects.
  There's no reasonable way to use the alpha channel with reflections. A
reflective opaque object is not transparent and thus it should not have any
alpha value. If it reflectes the "background", then what color should be
the reflection? The color of the background, of course.

  This is the correct behaviour and there's nothing wrong in it.

-- 
#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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