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Seeking confirmation that the below behavior is a bug when using
mesh objects in a CSG operation.
----------------------------------------------------------------
Bug report -
Mesh object evluated properly only when it is the top level object
in a CSG operation. The behavior is incorrect when it is a second
level object.
#macro Box_Mesh(Vec1,Vec2,In_Vect)
#if (Vec1.x=Vec2.x | Vec1.y=Vec2.y | Vec1.z=Vec2.z)
#debug "\n Box_Mesh detected identical vector values.\n" #end
#local P1=<Vec1.x, Vec1.y, Vec1.z>;
#local P2=<Vec2.x, Vec1.y, Vec1.z>;
#local P3=<Vec2.x, Vec1.y, Vec2.z>;
#local P4=<Vec1.x, Vec1.y, Vec2.z>;
#local P5=<Vec1.x, Vec2.y, Vec1.z>;
#local P6=<Vec2.x, Vec2.y, Vec1.z>;
#local P7=<Vec2.x, Vec2.y, Vec2.z>;
#local P8=<Vec1.x, Vec2.y, Vec2.z>;
mesh
{
triangle { P5, P1, P2} triangle { P5, P6, P2}
triangle { P6, P2, P3} triangle { P6, P7, P3}
triangle { P7, P3, P4} triangle { P7, P8, P4}
triangle { P8, P4, P1} triangle { P8, P5, P1}
triangle { P8, P5, P6} triangle { P8, P7, P6}
triangle { P4, P1, P2} triangle { P4, P3, P2}
inside_vector In_Vect
}
#end
camera { location<-2,3,-5> look_at y*.5 }
light_source { <-5,5,-5> 1 }
default { pigment {red 1} finish { ambient .4 diffuse .6 }}
// Works as expected - mesh as top level object in csg
difference
{
Box_Mesh(<-1,-1,-1>,<1,1,1>,<0,0,1>)
box{<-.75,-.75,-1.1>,<.75,.75,1.1> pigment{rgb 1}}
translate x*-1.2
}
// Does not work as expected - mesh as second level object in csg
difference
{
box{<-1,-1,-1>,<1,1,1> pigment{rgb 1}}
Box_Mesh(<-.75,-.75,-1.1>,<.75,.75,1.1>,<0,0,1>)
translate x*1.2
}
// Does not work as expected - mesh as top and second level object in csg
difference
{
Box_Mesh(<-1,-1,-1>,<1,1,1>, <0,0,1>)
Box_Mesh(<-.75,-.75,-1.1>,<.75,.75,1.1>,<0,0,1>)
translate y*2
}
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"Ken" <tyl### [at] pacbell net> wrote in message
news:3D7F459A.BABE7B59@pacbell.net...
> mesh
> {
> triangle { P5, P1, P2} triangle { P5, P6, P2}
> triangle { P6, P2, P3} triangle { P6, P7, P3}
> triangle { P7, P3, P4} triangle { P7, P8, P4}
> triangle { P8, P4, P1} triangle { P8, P5, P1}
> triangle { P8, P5, P6} triangle { P8, P7, P6}
> triangle { P4, P1, P2} triangle { P4, P3, P2}
> inside_vector In_Vect
> }
Confirmed, but I get this 4 times:
Warning: Patch objects not allowed in intersection.
3.5.icl.win32. Win98SE
Alf
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