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"nemesis" <nam### [at] gmail com> wrote:
> I can't help but ask why, why not simply normals? it's not even a close up...
>
> there's enough issues with coincident surfaces in plain CSG, put isosurfaces to
> the mix and you're asking for trouble...
I was intending to use isosurfaces because they should blend in better,
especially under the arch. With normals (procedural or bump_maps) there's still
a sharp demarcation between the wall and the arch.
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> With normals (procedural or bump_maps) there's still
> a sharp demarcation between the wall and the arch.
apply the textures after the transformations.
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jhu napsal(a):
> I'm trying to make a room with stucco by subtracting out isosurfaces. As you can
> see in this test render, in the room where the camera is located the stucco
> renderes as it should. However, the arrows pointing toward the archway show an
> area that is subtracted out but is rendering in all black. Anyone encounter
> this before with a solution?
>
>
>
> ------------------------------------------------------------------------
>
once I had this problem with coincident surfaces. But I can't see any in
your code.
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> I'm trying to make a room with stucco by subtracting out isosurfaces. As
> you can
> see in this test render, in the room where the camera is located the
> stucco
> renderes as it should. However, the arrows pointing toward the archway
> show an
> area that is subtracted out but is rendering in all black. Anyone
> encounter
> this before with a solution?
>
Sometimes isosurfaces do that when they are used in
differences. Fortunately you can just put the differences
into the formulas for the isosurfaces...
#include "colors.inc"
global_settings {
assumed_gamma 1
}
background{White}
light_source {
<0,1,0>, color <1,0.9,0.7>
fade_distance 2
fade_power 2
}
light_source {
<0,2.5,10>, White*0.1
shadowless
}
camera {
location <0,1.75,0>
right <450/300,0,0>
look_at <0,1.75,10>
rotate y*-12
translate <1.75,0,-3>
}
#declare fn_Pigm=function {
pigment {
agate
color_map {
[0 color rgb 0]
[1 color rgb 1]
}
}
};
#declare useIso = true;
union {
// floor
box { <-200,-100,-100>, <200,0,7.5>
texture {
pigment {Brown}
finish {
specular 0.8
roughness 0.05
reflection 0.1
}
}
}
// ceiling
box { <-200,10,-100>, <200,200,7.5>
}
// near wall with arch
#if (useIso)
isosurface {
function { max( (abs(z)-0.25),
-min( max( (abs(x)-2.5),
(abs(y+2.5)-2.5)),
(sqrt(pow(x,2) + pow(y,2)) - 2.5)
)
)
+fn_Pigm(x*2, y*2, z*2).gray*0.01 // texture
}
accuracy 0.001
max_gradient 1.43
contained_by {box {<-20,-10,-2>,<20,10,2>} }
translate <0,1.25,1.75>
}
#else
difference {
box { <-200,-10,1.5>,<200,10,2>}
cylinder{<0,1.25,0.9>, <0,1.25,2.1>, 2.5}
box {<-2.5,-10,0.9>,<2.5,1.25,2.1>}
}
#end
// left wall with arch
#if (useIso)
isosurface {
function { max( (abs(x)-0.25),
-min( max( (abs(z)-2.5),
(abs(y+2.5)-2.5)
),
(sqrt(pow(z,2)+pow(y,2))-2.5)
)
)
+fn_Pigm(x*2, y*2, z*2).gray*0.01
}
accuracy 0.001
max_gradient 1.43
contained_by {box {<-1,-10,-20>,<1,10,7.5>} }
translate <-2.75,1.25,-1>
}
#else
difference {
box { <-2.5,-10,-200>,<-3,10,7.5>}
cylinder{<-5,0,0>, <-2.4,0,0>, 2.5 translate <0,1.25,-1>}
}
#end
// right wall
#if (useIso)
isosurface {
function { (abs(x)-0.25)
+fn_Pigm(x*2, y*2, z*2).gray*0.01
}
accuracy 0.001
max_gradient 1.43
contained_by {box {<-1,-10,2>,<1,10,7.5>} }
translate <2.75,0,0>
}
#else
box { <2.5,-10,2>,<3,10,7.5>
}
#end
//far wall with door
#if (useIso)
isosurface {
function { max(
(abs(z)-0.5),
-max(
(sqrt(pow(x,2) + pow(y+2,2)) - 5),
(abs(x)-1.25)
)
)
+fn_Pigm(x*2, y*2, z*2).gray*0.01
}
accuracy 0.001
max_gradient 1.43
contained_by {box {<-20,-10,-1>,<20,10,1>} }
translate <0,0,7>
}
#else
difference {
box { <-200,-10,6>,<200,10,7.5>}
//door
difference {
box {<-1.25,-200,5.9>,<1.25,5,10>}
cylinder {<0,-2,5.9>, <0,-2,10>, 5 inverse}
}
}
#end
texture {
pigment {White}
finish {
specular 0.4
roughness 0.05
}
}
}
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Attachments:
Download 'iso_room.jpg' (39 KB)
Preview of image 'iso_room.jpg'
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jhu napsal(a):
> Here's the relevant code with comments. It's basically a box differenced with
> other objects and isosurfaces.
>
> light_source{
> <0,1,0>
> White
> }
> camera {
> location <0,1.75,0>
> look_at <0,1.75,10>
> rotate y*-12
> translate <1.75,0,-3>
> right <450/300,0,0>
> }
>
>
> #declare fn_Pigm=function {
> pigment {
> agate
> color_map {
> [0 color rgb 0]
> [1 color rgb 1]
> }
> }
> }
>
> difference{
> box{<-200,-1,-100>, <200,200,7.5>} //the main room
>
> // the +z room with window
> union{
> box{<-2.5,-.001,2>, <2.5,10,6>}
> difference{ //makes the hole for the door on the +z side of the room
> #declare R=5;
> #declare H=3;
> cylinder{<0,0,5.9>, <0,0,10>, R}
> box{<-100, -100, -100>, <-1.25,100, 100>}
> box{<1.25, -100, -100>, <100,100, 100>}
> box{<-100,-100,-100>, <100, 5-H,100>}
> translate y*-R
> translate y*H
> }
> }
>
> //the camera room
> box{<-2.5,-.001,-9>, <5,6.0001,1.5>} // room with camera
> difference{//makes archway to connect camera room with +z room
> cylinder{<0,0,.9>, <0,0,2.1>, 2.5 translate y*1.25}
> box{<-100, -100, -100>, <100,-.0001,100>}
> }
>
> isosurface{//makes the camera room have stucco
> function{(y*y+x*x-2.5*2.5)-fn_Pigm(x*2, y*2, z*2).gray*0.1}
> accuracy 0.0001
> max_gradient 9
> contained_by {box {<-10,-10,.9> <10,10,2.5>}}
> translate <0,1.25,0>
> pigment{White}
> }
>
>
> isosurface{//makes the camera room have stucco
> function{max((y*y-(3*3)),(x*x-(3.75*3.75)),(z*z-(5.25*5.25)))-fn_Pigm(x*2,
> y*2, z*2).gray*0.1}
> accuracy 0.0001
> max_gradient 20
> contained_by {box {-20 20}}
> pigment{White}
> translate <3.75-2.5,3.05,-(5.25-1.5)>
> }
>
>
> //the -x room
> box{<-2.49999,-.001,-9>, <2.49999,6.0001,1.5> translate x*(-5.5)}
> difference{//make the archway connecting the camera room to the -x room
> cylinder{<-5,0,0>, <-2.4,0,0>, 2.5 translate <0,1.25,-1>}
> box{<-100, -100, -100>, <100,-.0001,100>}
> }
> pigment{White}
> }
>
>
Hello again,
when I removed the stuccos the problem disappeared.
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Wow! Thanks for the help and tips. That's some serious isosurface-kung-fu there.
"Tim Attwood" <tim### [at] comcastnet> wrote:
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nemesis nous apporta ses lumieres en ce 2008/01/12 22:28:
> I can't help but ask why, why not simply normals? it's not even a close up...
>
> there's enough issues with coincident surfaces in plain CSG, put isosurfaces to
> the mix and you're asking for trouble...
>
>
Normals would give you different results, the sadows would be different, as well
as the continuation between the different surfaces. That's even if you apply the
normals to the object as a whole. Even at this scale you'd have large difference.
--
Alain
-------------------------------------------------
REMEMBER: WHATEVER HAPPENS, HAPPENS FOR A REASON.
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jhu wrote:
> Wow! Thanks for the help and tips. That's some serious isosurface-kung-fu there.
I think Tim gave you the best solution to your problem, so I'll take
this opportunity to slip out the door :)
Sam
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I think I'm going to give up on the isosurface room. Rendering takes way too
long especially with area lights and radiosity. On the other hand, I did get to
finally learn how to use these things.
BTW, is there an isosurface to mesh2 conversion utility?
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Wasn't it jhu who wrote:
>BTW, is there an isosurface to mesh2 conversion utility?
There's Kevin Loney's Approximation Macro. It's rather slow but you only
need to run it once, then you can save the mesh.
http://www.econym.demon.co.uk/isotut/approx.htm
If you can rewrite your isosurface as a parametric, then you can use
Ingo Janssen's Param.Inc, which is much faster.
http://www.econym.demon.co.uk/isotut/param.htm
--
Mike Williams
Gentleman of Leisure
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