Bob Hughes wrote:
> 
> Rather than try and make guesses I just tried to make such a thing myself
> and I couldn't even see any reversed (or whatever) reflection:

First: Thank you very much for trying to help me!

I'm quite frustrated, because I need the reflections from this 
middle "cigar" shape to behave correctly(?) in other scenes.

I have now included some of my source code below so that you can see 
what I'm actually doing.

Note that my convex "cigar" shape is made with a torus that has a 
greater minor radius than major radius.

And I now wonder if this could cause the odd change in reflections?

(As I understand from your code, you are making a similar shape by 
scaling a sphere along an axis.)

Regards

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

#version 3.1;

#include "colors.inc"
#include "textures.inc"

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

#declare v3Origo = <0, 0, 0>;

#macro Pythagoras(hyp, kat)

 sqrt(hyp*hyp - kat*kat)

#end // macro Pythagoras

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

#declare RadW = 1.0; // Max Radius for Wide   part (Cigar Shape)
#declare RadN = 0.5; // Min Radius for Narrow part (Spoke shape)

#declare RadMinC = 26; // Minor Radius for Cigar shape
#declare RadMinS = 26; // Minor Radius for Spoke shape

#declare HoleClearing = 0.1;

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

#declare RadMajC = RadMinC - RadW; // Major Radius for Cigar shape
#declare RadMajS = RadMinS + RadN; // Major Radius for Spoke shape

#declare ss = Pythagoras(RadMinC + RadMinS, RadMajC + RadMajS);
#declare tt = ss*RadMinS/(RadMinC + RadMinS);

#declare DistBetween = 2*ss; // RadW + RadN

#declare Cigar =
difference {
  sphere { v3Origo, Pythagoras(RadMinC, RadMajC) }
  torus { RadMajC, RadMinC }
  cylinder { (RadW + RadN)*x, -(RadW + RadN)*x, RadN + HoleClearing }
//  plane {  y, tt - ss }
//  plane { -y, tt - ss }
}

#declare Spoke =
difference {
  sphere { v3Origo, vlength(<RadMajS, RadMinS>) }
  torus { RadMajS, RadMinS }
  plane {  y, -tt }
  plane { -y, -tt }
}

//#declare SpkCig =
merge { 
  object { Cigar translate +ss/2*y }
  object { Spoke translate -ss/2*y }
  texture { Soft_Silver }
  pigment { color Red }
}

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

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