[ff3d-users] POVRAY keywords "inverse"

[Robert Li]

Dear Stephane Del Pino,
  We can use inverse keyword to change the normal
orientation of plane. For example 
1:
intersection {
box { <0,  0,  2>, < 2, 2, 4  > pigment { color rgb
<0,1,0> } }
plane  { <0,0,1>, 2 /*inverse*/  pigment { color rgb
<0,1,1> }}

}
the intersection  result is a plane(z=2). <0,0,1> is
inner normal of the bottom face.

2:
intersection {
box { <0,  0,  2>, < 2, 2, 4  > pigment { color rgb
<0,1,0> } }
plane  { <0,0,1>, 2 inverse  pigment { color rgb
<0,1,1> }}

}
the intersection  result is a box."<0,0,1>, 2 inverse"
is outer normal of the bottom face.

In order to use boundary conditions, I must get the
face of Omega objects.

Do you think we should add the keyword "inverse"? 


Robert


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