Should be an easy question but the brain doesn't want to think.  How do I
rotate a 2D face or triangle so that it faces the camera?

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Calculate its perpendicular first.  Any three points define a plane, and
that plane has a perpendicular vector that is often called a "normal".  Rotate
the triangle so that its normal is aimed at the camera location.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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Sir Charles W. Shults III <aic### [at] cflrrcom> wrote:
> Rotate
> the triangle so that its normal is aimed at the camera location.

  You should have given some hint on how to do this (it's not that trivial,
after all).
  For a way, see the documentation about transforms.inc (specially about
the Reorient_Trans() macro).

-- 
#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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