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I have an object bounded by a box. it works fine except when I try and move it
or change the camera angle and the bounding box looses it's affect.
Is this a bug?
Code:
#declare Lowermouth = union{
torus{ 0.6, 0.2 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,0>}
torus{ 0.55, 0.19 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.25>}
torus{ 0.5, 0.18 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.5>}
torus{ 0.45, 0.165 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.75>}
torus{ 0.4, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1>}
torus{ 0.35, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.25>scale
<1,0.99,1>}
torus{ 0.29, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.5>scale
<1,0.98,1>}
torus{ 0.22, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.75>scale
<1,0.96,1>}
torus{ 0.15, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-2>scale
<1,0.94,1>}
}
#declare Lowermouth1 = object { Lowermouth
bounded_by {
box {
<-3, -0.3, -3>, <3, -3, 3>
}
}
}
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From: Le Forgeron
Subject: Re: Object changes when translated, rotated, or camera position changes
Date: 1 Nov 2013 15:28:41
Message: <527400e9@news.povray.org>
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Le 01/11/2013 17:38, Charles nous fit lire :
> I have an object bounded by a box. it works fine except when I try and move it
> or change the camera angle and the bounding box looses it's affect.
> Is this a bug?
> Code:
>
> #declare Lowermouth = union{
> torus{ 0.6, 0.2 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,0>}
> torus{ 0.55, 0.19 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.25>}
> torus{ 0.5, 0.18 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.5>}
> torus{ 0.45, 0.165 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.75>}
> torus{ 0.4, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1>}
> torus{ 0.35, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.25>scale
> <1,0.99,1>}
> torus{ 0.29, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.5>scale
> <1,0.98,1>}
> torus{ 0.22, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.75>scale
> <1,0.96,1>}
> torus{ 0.15, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-2>scale
> <1,0.94,1>}
> }
> #declare Lowermouth1 = object { Lowermouth
> bounded_by {
> box {
> <-3, -0.3, -3>, <3, -3, 3>
> }
> }
> }
>
>
Bounded_by is no shortcut for proper intersection.
The Lowermouth is so far inside a box of <-0.800,-1.000,-2.150 >,
<0.800,0.600,0.200>
So your bounded_by box <-3,-0.3, -3>,<3,-3,3> is overlapping (hence
bogus). Garbage in... garbage out.
#declare fom=min_extent(Lowermouth1);
#declare fom2=max_extent(Lowermouth1);
#debug "Hello\n"
#debug concat(vstr(3,fom,",",0,3),"\n")
#debug concat(vstr(3,fom2,",",0,3),"\n")
#debug "World\n"
Post a reply to this message
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From: Alain
Subject: Re: Object changes when translated, rotated, or camera position changes
Date: 2 Nov 2013 23:12:57
Message: <5275bf39$1@news.povray.org>
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> I have an object bounded by a box. it works fine except when I try and move it
> or change the camera angle and the bounding box looses it's affect.
> Is this a bug?
> Code:
>
> #declare Lowermouth = union{
> torus{ 0.6, 0.2 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,0>}
> torus{ 0.55, 0.19 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.25>}
> torus{ 0.5, 0.18 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.5>}
> torus{ 0.45, 0.165 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-0.75>}
> torus{ 0.4, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1>}
> torus{ 0.35, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.25>scale
> <1,0.99,1>}
> torus{ 0.29, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.5>scale
> <1,0.98,1>}
> torus{ 0.22, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-1.75>scale
> <1,0.96,1>}
> torus{ 0.15, 0.15 texture{Bodytex} rotate<90,0,0>translate <0,-0.2,-2>scale
> <1,0.94,1>}
> }
> #declare Lowermouth1 = object { Lowermouth
> bounded_by {
> box {
> <-3, -0.3, -3>, <3, -3, 3>
> }
> }
> }
>
>
bounded_by is NO substitute to an intersection.
Missusing it that way will cause many problems:
Improper shadows.
Parts that are outside the bounding object are visible whenever the ray
can encounter the bounding object. If a ray encounter the bounding
object, it's content is tested for the entire path of that ray.
If you want to clip the object in a way that it's inside become visible,
you can use clipped_by.
Use:
#declare Lowermouth1 = intersection{
object { Lowermouth }
box { <-3, -0.3, -3>, <3, -3, 3> }
}
OR
#declare Lowermouth1 = object { Lowermouth
clipped_by {
box {
<-3, -0.3, -3>, <3, -3, 3>
}
}
}
Alain
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