I join a pov file with an object, i'm working on. I got a black circle (hole
?) on my csg object. I'm searching for hours what's wrong, but i don't find
anything.

Please, can somebody here help me ??
What's wrong in my object ?

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Attachments:
Download 'test.pov.txt' (2 KB)

'inverse' used either within the Machin object (used in Machin1) or the
'difference' of it and the smaller sphere removes the spot (it is the
inner sphere or hollow caused by it you see). I have no explanation for
this effect. Appears to cause a hole in the surface.
I tried a difference on the 2 test objects for a cut-away view and only
the correct one on the left side seems right no matter what I tried. The
one on the right (incorrect) did not have the proper interior.
Anyhow unless you are going to be viewing the interior the 'inverse'
will fix it.
Something odd does seem to be going on though, just wish I knew what.


bassompierre laurent wrote:
> 
> I join a pov file with an object, i'm working on. I got a black circle (hole
> ?) on my csg object. I'm searching for hours what's wrong, but i don't find
> anything.
> 
> Please, can somebody here help me ??
> What's wrong in my object ?
> 
> //  totally crazy ????
> #version 3.1;
> 
> global_settings
> {
>   assumed_gamma 1.0
> }
> 
> //
> // a camera
> //
> camera
> {
>   location  <-12, 0, 0>
>   look_at   <7, 0, 0>
> }
> //
> // some lights
> //
> light_source { <-5,3,-5> color rgb <1,1,1>}
> light_source { <-5,3,5> color rgb <1,1,1>}
> light_source { <-5,-3,-5> color rgb <1,1,1>}
> light_source { <-5,-3,5> color rgb <1,1,1>}
> //
> // A Tube
> //
> #declare Tube=difference {
>         cylinder {-2.6*x,2.6*x,.2}
>         cylinder {-2.7*x,2.7*x,.15}
> }
> //
> // I put it around a sphere
> #declare Machin=union {
>         sphere {0,2.5}
>         #local Nb=1;
>         #while (Nb<9)
>                 #local Angle=(360/8)*Nb;
>                 object { Tube
>                         rotate 25*z
>                         rotate Angle*y
>                 }
>                 object { Tube
>                         rotate 50*z
>                         rotate (360/16+Angle)*y
>                 }
>                 #local Nb=Nb+1;
>         #end
> }
> //
> // I want to make this object empty
> // So I make a CSG difference with a sphere
> //
> #declare Machin1=difference {
>         object {Machin} // Radius of sphere : 2.5
>         sphere {0,1} // a smaller radius
> }
> object {Machin // Not empty object
>         translate 3*z
>         pigment {color rgb 1.5*<.6, .25, .15>}
>         finish {ambient 0.4}
> }
> object {Machin1 // empty object : what about the black circle on his surface !!!!!
>         translate -3*z
>         pigment {color rgb 1.5*<.6, .25, .15>}
>         finish {ambient 0.4}
> }

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.htm
 mailto:inv### [at] aolcom?PoV

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Sorry, but my english is too poor to understand your explanation. Can you
post my code modified please ?
Thanks
Laurent bassompierre
lba### [at] ubifr


>'inverse' used either within the Machin object (used in Machin1) or the
>'difference' of it and the smaller sphere removes the spot (it is the
>inner sphere or hollow caused by it you see). I have no explanation for
>this effect. Appears to cause a hole in the surface.
>I tried a difference on the 2 test objects for a cut-away view and only
>the correct one on the left side seems right no matter what I tried. The
>one on the right (incorrect) did not have the proper interior.
>Anyhow unless you are going to be viewing the interior the 'inverse'
>will fix it.
>Something odd does seem to be going on though, just wish I knew what.
>
>

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So sorry I didn't get back to you earlier, I don't read this group as
often as others. Following is your scene file re-done. Not sure if it
will make any more sence, I am still puzzled by the behaviour
surrounding it, though it is fixed(?).

//  totally crazy ????
#version 3.1;

global_settings
{
  assumed_gamma 1.0
}

//
// a camera
//
camera
{
  location  <-12, 0, 0>
  look_at   <7, 0, 0>
}
//
// some lights
//
//light_source { <-5,3,-5> color rgb <1,1,1>}
//light_source { <-5,3,5> color rgb <1,1,1>}
//light_source { <-5,-3,-5> color rgb <1,1,1>}
light_source { <-5,-3,5> color rgb <1,1,1>}
//
// A Tube
//
#declare Tube=difference {
        cylinder {-2.6*x,2.6*x,.2}
        cylinder {-2.7*x,2.7*x,.15}
     // pigment {rgbf 1}
}
//
// I put it around a sphere
#declare Machin=union {
        sphere {0,2.5}
        #local Nb=1;
        #while (Nb<9)
                #local Angle=(360/8)*Nb;
                object { Tube
                        rotate 25*z
                        rotate Angle*y
                }
                object { Tube
                        rotate 50*z
                        rotate (360/16+Angle)*y
                }
                #local Nb=Nb+1;
        #end
}
//
// I want to make this object empty
// So I make a CSG difference with a sphere 
//
#declare Machin1=difference {
        object {Machin} // Radius of sphere : 2.5
        sphere {0,1 pigment {rgb<0,1,0>} finish {ambient 1}} // a
smaller radius
      inverse
}

//difference {
 union {
object {Machin // Not empty object
        translate 3*z
        pigment {color rgb 1.5*<.6, .25, .15>}
        finish {ambient 0.4}
     //inverse
}
object {Machin1 // empty object : what about the black circle on his
surface !!!!!
        translate -3*z
        pigment {color rgb 1.5*<.6, .25, .15>}
        finish {ambient 0.4}
     //inverse
}
 }
// plane {x,0 pigment {rgbf 1}} //attempted cut-away looks strange (-x
if inversed above)
   //inverse
//}


bassompierre laurent wrote:
> 
> Sorry, but my english is too poor to understand your explanation. Can you
> post my code modified please ?
> Thanks
> Laurent bassompierre
> lba### [at] ubifr
> 

> >'inverse' used either within the Machin object (used in Machin1) or the
> >'difference' of it and the smaller sphere removes the spot (it is the
> >inner sphere or hollow caused by it you see). I have no explanation for
> >this effect. Appears to cause a hole in the surface.
> >I tried a difference on the 2 test objects for a cut-away view and only
> >the correct one on the left side seems right no matter what I tried. The
> >one on the right (incorrect) did not have the proper interior.
> >Anyhow unless you are going to be viewing the interior the 'inverse'
> >will fix it.
> >Something odd does seem to be going on though, just wish I knew what.
> >
> >

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.htm
 mailto:inv### [at] aolcom?PoV

Post a reply to this message