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Quite often I run ito the problem that polygons won't render because not
all the points are on the same plane. Today I figured out how to fix
that, scene below, but is there a more efficient way?
---%<------%<------%<---
#version 3.7;
global_settings{ assumed_gamma 1.0 }
#default{ finish{ ambient 0.1 diffuse 0.9 }}
#include "math.inc"
#include "transforms.inc"
camera {
perspective angle 5
location <0 , 10 ,-10>
look_at <0,0,0>
}
light_source{< 500,3000,-500> rgb 1}
light_source{<-3000,3000,-3000> rgb .5}
#declare Point=array[6]{
<0.429381,-0.055167, 0.379816>,
<0.516580,-0.092380, 0.240426>,
<0.291647,-0.556033,-0.000017>,
<0.185583,-0.627011, 0.044906>,
<0.097999,-0.570008, 0.205955>,
<0.172851,-0.214639, 0.501546>,
};
#declare Normal = <0.614179,-0.577098,0.538277>;
// distance from the first point to the plane
#declare Distance = vdot(Normal,Point[0]);
#declare T = transform{translate Normal*Distance};
#for(I,0,dimension_size(Point,1)-1,1)
// push the points to the aligned plane
#declare Point[I] = VProject_Plane(Point[I], Normal);
// translate them to their 'original' positions
#declare Point[I] = vtransform(Point[I], T);
#end
polygon{
7,
Point[0]
Point[1]
Point[2]
Point[3]
Point[4]
Point[5]
Point[0]
pigment{rgb 1}
}
sphere{0,0.01 pigment{rgb x}}
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Le 19-02-09 à 12:15, ingo a écrit :
> Quite often I run ito the problem that polygons won't render because not
> all the points are on the same plane. Today I figured out how to fix
> that, scene below, but is there a more efficient way?
>
>
> ---%<------%<------%<---
> #version 3.7;
> global_settings{ assumed_gamma 1.0 }
> #default{ finish{ ambient 0.1 diffuse 0.9 }}
> #include "math.inc"
> #include "transforms.inc"
>
> camera {
> perspective angle 5
> location <0 , 10 ,-10>
> look_at <0,0,0>
> }
> light_source{< 500,3000,-500> rgb 1}
> light_source{<-3000,3000,-3000> rgb .5}
>
> #declare Point=array[6]{
> <0.429381,-0.055167, 0.379816>,
> <0.516580,-0.092380, 0.240426>,
> <0.291647,-0.556033,-0.000017>,
> <0.185583,-0.627011, 0.044906>,
> <0.097999,-0.570008, 0.205955>,
> <0.172851,-0.214639, 0.501546>,
> };
> #declare Normal = <0.614179,-0.577098,0.538277>;
>
> // distance from the first point to the plane
> #declare Distance = vdot(Normal,Point[0]);
> #declare T = transform{translate Normal*Distance};
> #for(I,0,dimension_size(Point,1)-1,1)
> // push the points to the aligned plane
> #declare Point[I] = VProject_Plane(Point[I], Normal);
> // translate them to their 'original' positions
> #declare Point[I] = vtransform(Point[I], T);
> #end
>
> polygon{
> 7,
> Point[0]
> Point[1]
> Point[2]
> Point[3]
> Point[4]
> Point[5]
> Point[0]
> pigment{rgb 1}
> }
> sphere{0,0.01 pigment{rgb x}}
>
If you create your polygon on the X-Y plane, you won't have any problem.
Then, it's just a mater of rotating it as needed :
#declare Point=array[6]{
<0.429381,-0.055167>,
<0.516580,-0.092380>,
<0.291647,-0.556033>,
<0.185583,-0.627011>,
<0.097999,-0.570008>,
<0.172851,-0.214639>,
};
polygon{
7,
Point[0]
Point[1]
Point[2]
Point[3]
Point[4]
Point[5]
Point[0]
pigment{rgb 1}
rotate Some_Rotation
}
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in news:5c60810c$1@news.povray.org Alain wrote:
> If you create your polygon on the X-Y plane
Should have added that the points are generated externaly and have 3
coordinates,
merci Alain,
ingo
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Quite interesting Polygons in a plane that's not on the z plane.
I've haven't played with polygons for a long time.
What you've done looks good, but you'll like to do better(fast).
Give me awhile to play with this new toy and see what I can see.
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I've come up with something which maybe faster.
The main idea behind this is that you only change the points you have to.
Here it is:
// Vers: 3.7
// Auth: Leroy Whetstone
// Email whe### [at] gmail com
// Translate polygon,normal data to POV polygon
//====================================================================
#version 3.7;
#include "colors.inc"
#include "math.inc"
global_settings {assumed_gamma 1 max_trace_level 20}
camera{ location <-3,3,-3>
look_at <0,0,0>
right x*image_width/image_height
}
light_source{<0,10,0> color White}
light_source{<0,0,-10> color White}
//---------- Test Data --------------------
#declare
Data=array[11]{<-0.32,0.32,0>,<-0.12,0.386667,0>,<0.0933333,0.28,0>,<0.16,-0.0266667,0>,
<0.266667,-0.213333,0>,<0.2,-0.32,0>,<0.0666667,-0.266667,0>,
<-0.0133333,-0.346667,0>,<-0.16,-0.12,0>,<-0.32,0.0666667,0>,
<-0.32,0.32,0>}
#declare Norm=-z;
#declare TestR=<95,30,10>; // test rotate
// --------- move test points --------------------
#for(a,0,10)
#declare Data[a]=vrotate(Data[a],TestR)-2*x+y;
#end
#declare Norm=vrotate(Norm,TestR);
#declare Data[5]=Data[5]+x*.0001;
// ----------------get plane----------------
#macro SetPlane()
#local V=Norm;
#declare Cp= (Data[0]+Data[1]+Data[2])/3;// center point of triangle data 0,1,2
#local V1=vnormalize(Cp);
#if((V1.x=V.x)&(V1.x=V.y)&(V1.x=V.y))
#local D= vlength(Cp);
#else
#local Ag=VAngle(Cp,V);
#local D= vlength(Cp)*cos(Ag);
#end
#declare K=D*sqrt(V.x*V.x + V.y*V.y + V.z*V.z);//keep part of plane equation
#end
#macro Test(T)
#local O=Norm.x*T.x + Norm.y*T.y + Norm.z*T.z -K ;//test on plane ?
O
#end
//Test and Fix Data
SetPlane();
#for(a,0,10)
#declare B=Test(Data[a]);//if B=0 point is on plane
#if(B) #debug concat("A =",str(a,0,0)," B=",str(B,9,9),"\n")
#declare Data[a]=VProject_Plane(Data[a]-Cp, Norm)+Cp; // fix broken data
#end
#end
// origonal polygon rotate and move to veiw
polygon{
11
<-0.32,0.32>
<-0.12,0.386667>
<0.0933333,0.28>
<0.16,-0.0266667>
<0.266667,-0.213333>
<0.2,-0.32>
<0.0666667,-0.266667>
<-0.0133333,-0.346667>
<-0.16,-0.12>
<-0.32,0.0666667>
<-0.32,0.32>
rotate TestR
pigment{Red}
translate x*2
}
// test polygon
polygon{
11
#for(a,0,10)
Data[a]
#end
pigment{Red}
}
#for(a,0,10)
#debug concat("Data[",str(a,0,0),"] = <",vstr(3,Data[a] ,",",3,3),">\n")
#end
Have Fun!
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in news:web.5c69ea83c4e92e71ac15978b0@news.povray.org Leroy wrote:
> Have Fun!
>
>
I'll have a poke at it Leroy, thanks,
ingo
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