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In article <3caa2e16@news.povray.org>, "JRG" <jrg### [at] hotmail com>
wrote:
> Ah. You are mistaken here. If you don't use 'interior', POV-Ray
> objects don't have true interior at all. Inverse just tells POV-Ray
> to consider 'inside' what before was 'outside'. That's it. It's an
> infinite surface which makes an infinite object.
Actually, the interior keyword has nothing to do with whether an object
is considered solid or not. Otherwise, you would have to specify an
interior just to use CSG.
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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Would I simply use a bounded_by for the heightfield itself rather than on
the difference between it and the box?
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3caa034f@news.povray.org>,
> "Patrick Dugan" <pat### [at] usnetcomcorpcom> wrote:
>
> > #declare One =
> > difference {
> > height_field {
> > tga "MyPicture.tga"
> > smooth
> > hierarchy on
> > translate <-0.5, -0.5, -0.5>
> > rotate <-90,0,0>
> > scale <0.3,1,0.1>
> > photons {target reflection on}
> > }
> > box{<-0.2,-0.6,-0.02>,<0.2,0.6,2> pigment {rgbft <1,1,1,0,1>}
> > no_shadow no_reflection no_image photons {collect off}
> > }
> > bounded_by { box{<-5,-5,-5>,<5,5,5>}}
> > }
>
> A point is considered "inside" a height_field if it is "below" it. If
> the height_field is not rotated or sheared, all points -y of some part
> of the surface are inside it.
>
> POV seems to have a hard time with this fact in this case, it knows the
> height field isn't bound to a cubic space and that the difference
> surface may occur anywhere, so it considers it to be infinite when
> computing the bounding boxes. A better solution might be to use a box
> extending very far downward for the CSG bounding computations, or to
> limit the height_field object to a cube.
>
> --
> Christopher James Huff <chr### [at] maccom>
> POV-Ray TAG e-mail: chr### [at] tagpovrayorg
> TAG web site: http://tag.povray.org/
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I finally gave up. I re-created the object using primitives and avoided the
HF altogether. The object is now finite
"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3caa034f@news.povray.org>,
> "Patrick Dugan" <pat### [at] usnetcomcorpcom> wrote:
>
> > #declare One =
> > difference {
> > height_field {
> > tga "MyPicture.tga"
> > smooth
> > hierarchy on
> > translate <-0.5, -0.5, -0.5>
> > rotate <-90,0,0>
> > scale <0.3,1,0.1>
> > photons {target reflection on}
> > }
> > box{<-0.2,-0.6,-0.02>,<0.2,0.6,2> pigment {rgbft <1,1,1,0,1>}
> > no_shadow no_reflection no_image photons {collect off}
> > }
> > bounded_by { box{<-5,-5,-5>,<5,5,5>}}
> > }
>
> A point is considered "inside" a height_field if it is "below" it. If
> the height_field is not rotated or sheared, all points -y of some part
> of the surface are inside it.
>
> POV seems to have a hard time with this fact in this case, it knows the
> height field isn't bound to a cubic space and that the difference
> surface may occur anywhere, so it considers it to be infinite when
> computing the bounding boxes. A better solution might be to use a box
> extending very far downward for the CSG bounding computations, or to
> limit the height_field object to a cube.
>
> --
> Christopher James Huff <chr### [at] maccom>
> POV-Ray TAG e-mail: chr### [at] tagpovrayorg
> TAG web site: http://tag.povray.org/
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Patrick Dugan <pat### [at] netinsnet> wrote:
> I finally gave up. I re-created the object using primitives and avoided the
> HF altogether. The object is now finite
Why didn't you clip the object as I suggested? It would have made the
object finite.
Well, do as you wish.
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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Because clipping didn't work. Clipping the object as you suggested resulted
in the object disappearing.
"Warp" <war### [at] tagpovrayorg> wrote in message
news:3caaedd0$1@news.povray.org...
> Patrick Dugan <pat### [at] netinsnet> wrote:
> > I finally gave up. I re-created the object using primitives and avoided
the
> > HF altogether. The object is now finite
>
> Why didn't you clip the object as I suggested? It would have made the
> object finite.
> Well, do as you wish.
>
> --
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -
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After I thought about what you suggested I realized I misunderstood what you
meant.
I assumed you meant to replace the bounded_by with a clipped_by. Of course
that removes the entire object.
I didn't try using a clipped_by (as opposed to a difference) on the HF. (I
feel pretty stupid right now....)
However recreating the object via primitives didn't take that long. Don't
know if it would be better memory/speedwise
to use the primtives or the HF but at this point it works so I'll probably
leave it alone.
Thank you for your suggestions.
Patrick Dugan
"Warp" <war### [at] tagpovrayorg> wrote in message
news:3caaedd0$1@news.povray.org...
> Patrick Dugan <pat### [at] netinsnet> wrote:
> > I finally gave up. I re-created the object using primitives and avoided
the
> > HF altogether. The object is now finite
>
> Why didn't you clip the object as I suggested? It would have made the
> object finite.
> Well, do as you wish.
>
> --
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -
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Patrick Dugan <pat### [at] usnetcomcorpcom> wrote:
> Because clipping didn't work. Clipping the object as you suggested resulted
> in the object disappearing.
That only means that you clipped it in the wrong way. I asked you what
did you do, but you didn't answer.
The clipping object (eg. a box) should completely enclose the object to
be clipped. What did you do?
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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Here is the code as I tried it....
#declare DaggerHilt =
union {
difference {
height_field {
tga "DaggerHilt.tga"
smooth
hierarchy on
translate <-0.5, -0.5, -0.5>
rotate <-90,0,0>
scale <0.3,1,0.1>
photons {target reflection on}
}
box{<-0.2,-0.6,-0.02>,<0.2,0.6,2> pigment {rgbft <1,1,1,0,1>}
no_shadow no_reflection no_image photons {collect off}
}
}
difference {
superellipsoid {<0.10, 0.30> scale <0.033,0.11,0.045>}
cylinder{<-0.15,0,0>,<0.15,0,0>,0.015 translate <0,0.10,-0.05>}
cylinder{<-0.15,0,0>,<0.15,0,0>,0.015 translate <0,-0.10,-0.05>}
cylinder{<-0.15,0,0>,<0.15,0,0>,0.015 translate <0,0.10,0.05>}
cylinder{<-0.15,0,0>,<0.15,0,0>,0.015 translate <0,-0.10,0.05>}
translate <-0.01,0.005,-0.035>
photons {target reflection on}
}
texture {BChrome rotate z * 90}
clipped_by { box{<-5,-5,-5>,<5,5,5>}}
}
"Warp" <war### [at] tagpovrayorg> wrote in message
news:3cab0c69@news.povray.org...
> Patrick Dugan <pat### [at] usnetcomcorpcom> wrote:
> > Because clipping didn't work. Clipping the object as you suggested
resulted
> > in the object disappearing.
>
> That only means that you clipped it in the wrong way. I asked you what
> did you do, but you didn't answer.
> The clipping object (eg. a box) should completely enclose the object to
> be clipped. What did you do?
>
> --
> #macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb
M()}}
> N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
> N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// -
Warp -
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I tested that (with some image as heightfield) and didn't see any difference
between clipping it or not (clipping didn't make anything disappear).
And by the way, you should clip the object which is infinite, this being the
first difference.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
Post a reply to this message
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news:scekau8v06bpp9boqd50hvdf473po9pa2h@4ax.com...
> On Wed, 3 Apr 2002 00:47:29 +0200, "JRG" <jrg### [at] hotmailcom> wrote:
> > > > So a finite bounding_box _means_ a finite object.
> > >
> > > I never saw basic trick with bounding box near camera probably.
> >
> > I'm not sure what you want to say.
>
> Somehow I placed I instead of You. It's becouse of 24 hours at work.
>
> > Which trick?
>
> Currently I can't find most typical animation of this type of
trick/technic.
Best use of it I've seen is to have one object in the foreground, and
another object in the mirror. The two objects are actually placed in the
same place; one has it's bounding object in front of the camera (between
itself and the camera), and traces normally, the other has its bounding
object between the mirror and the camera (so when rays hit the mirror, the
object is traced).
...Chambers
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.323 / Virus Database: 180 - Release Date: 2/8/2002
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