Pardon me if my mathematics are insufficient to explain the problem
properly, but....

When doing some DIFFERENCEs where the, um, surfaces of the objects are
in the same plane it cuts a hole INTO the first object. not sure if it's
supposed to do this, or if it's a bug of somekind.


Follows code that shows the prob. It's a house block where I'm
subtracting a stair well. I got around this by the hack of adding .01 to
some of the coordinates. That works.

P200MMX w/ 128MB RAM running NT 4 SP3.
Using the new Povray 3.1 (non beta).




#declare T_Wall =
texture {
    pigment {
        color rgb<1,1,1>
    }
    finish {
        ambient 0.2
        brilliance .01
        diffuse 1
        roughness 1
        reflection 0
    }
}
#declare T_WallPaper =
texture {
    pigment {
        wood
        turbulence 0
        color_map {
            [0 color rgb<.8,.8,.75>]
            [.2 color rgb<1,1,1>]
        }
        scale .2
        rotate <-90,0,0>
    }
    finish {
        ambient 0.2
        brilliance .01
        diffuse 1
        roughness 1
        reflection 0
    }
}
#declare T_Masonry =
texture {
    pigment {
        brick color rgb<.6,.6,.6>, color rgb<1,1,.9>
        brick_size <8,3,4.5>
        mortar .25
        scale 1/8
        turbulence 0
    }
    finish {
        ambient 0.2
        brilliance .01
        diffuse 1
        roughness 1
        reflection 0
    }
}

camera {           
    angle 90 //wide-angle
    //location<36,3,-5>
    location<32,1,-5>
    look_at <32,0,12>
}

    light_source {
        <36,1,-4>
        color rgb<.9,.9,.8>
        fade_distance 2
        fade_power 1
    }
    light_source {
        <32,7.5,5>
        color rgb<.8,.8,1>
        fade_distance 2
        fade_power 1
    }
    light_source {
        <40,1,9>
        color rgb<1,.5,.5>
        fade_distance 2
        fade_power 1
    }

difference {
        merge {
            box { <0,  -.1, 0>, <51.5,8.5,29.5> texture {T_Wall} }
            box { <0,  -.1, 0>, <51.5,-4,29.5> texture {T_Masonry} }
            box { <-.5,-4,  -.5>, <52,-10.6,30> texture {T_Masonry} }
        }
        merge {
            box { <29.5,   3, 6.1>, <35.5,  -5, -1.5> }
            box { <29.5, -.1, 9.6>, <35.5, 8.1, 0.5> }
            texture {T_WallPaper}
        }
}





-- 
Lewis A. Sellers: writer and contract Multimedia Website Developer
mailto:lse### [at] usitnet (The Fourth Millennium Foundation)
http://www.public.usit.net/lsellers/ & http://www.fourthfoundation.com
http://brain-of-pooh.tech-soft.com/users/critters/bios/sellers_lewis.html

You can bug the living bejesus out of me live on ICQ @ 491461
(If I don't get back to you within a month, I'm out of prozac in some
dark corner somewhere screaming things quite unintelligable but -- most
curiously -- thick with a sumerian accent.)

"The comedy is over" -i pagliacci

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