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Index › Programming Questions & Help › Programs › 3D sphere with two colors
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3D sphere with two colors? (Read 2263 times)
maleche
3D sphere with two colors?
Jan 3rd, 2008, 2:33am  
How might I program a 3D sphere with two color halves. I am trying to develop a 3-Axis attitude gage like on an airplane, that shows roll, pitch and yaw.

The top half of the sphere is blue and bottom is green. The horizonal line (split between the two colors )is the horizon. I will over lay another horizontal line to match.

I greatly appreciate any assistance on the code.

Warmest regards,
Doyle
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antiplastik
Re: 3D sphere with two colors?
Reply #1 - Jan 3rd, 2008, 8:22am  
use a texture :
http://processing.org/reference/texture_.html
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eskimoblood
Re: 3D sphere with two colors?
Reply #2 - Jan 3rd, 2008, 1:27pm  
You can use the surfaceLib library, which can handle all you needs. Creating a sphere and then adding an array of the colors you need for every horizontal stripe. Here is a small code example.

Quote:


import processing.opengl.*;

import surface.calculation.*;
import surface.*;

Sphere s;

void setup(){
 size(500,500, OPENGL);
 s=new Sphere(g, 51,51);
 int[] colors = new int[51];
 for(int i = 0; i<colors.length; i++){

   if(i < 25) {
     colors[i]=color(58, 102, 132);

   }
   if(i == 25) {
     colors[i]=color(125);
 
   }
   if(i > 25){
     colors[i]=color(102, 102, 0);

   }

 }
 s.initHorizontalColors(colors);

 noStroke();
 smooth();
 
}

void draw(){
 background(255);
 translate(width/2,height/2);
 rotateX(radians(frameCount));
 rotateY(radians(frameCount));
 s.setScale(mouseX);
 s.draw();
}



Or you to it like that and draw different parts of the sphere consecutively:

Quote:


import processing.opengl.*;
import surface.calculation.*;
import surface.*;

Sphere s;

void setup(){
 size(500,500, OPENGL);
 s=new Sphere(g, 51,51);
 noStroke();
 smooth();
}

void draw(){
 background(255);
 translate(width/2,height/2);
 rotateX(radians(frameCount));
 rotateY(radians(frameCount));
 s.setScale(mouseX);
 fill(58, 102, 132);
 s.drawPart(0,51,0,25);
 fill(125);
 s.drawPart(0,51,25,26);
 fill(102, 102, 0);
 s.drawPart(0,51,26,51);
}
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Andreas Köberle {eskimoblood}
222550793  
maleche
Re: 3D sphere with two colors?
Reply #3 - Jan 4th, 2008, 2:24am  
It appears that the code show errors at my end.

build23148.tmp/Temporary_9705_3441.java:1:62:1:80: Semantic Error: You need to modify your classpath, sourcepath, bootclasspath, and/or extdirs setup. Jikes could not find package "surface.calculation" in:

I am new to Processing and not sure how to fix this error.

Thanks,
Doyle
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eskimoblood
Re: 3D sphere with two colors?
Reply #4 - Jan 4th, 2008, 3:56pm  
Ah ok, the surfaceLib is an additional library for processing. You have to download it here: http://www.eskimoblood.de/surfacelib/ . Copy the folder in your processingMainFolder/libaries folder and restart processing.
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Andreas Köberle {eskimoblood}
222550793  
maleche
Re: 3D sphere with two colors?
Reply #5 - Jan 6th, 2008, 12:30am  
Andreas,

  Thank you so much. This is perfect! You saved me many hours with the new library!

Regards,
Doyle
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Jim
Re: 3D sphere with two colors?
Reply #6 - Apr 11th, 2010, 2:52am  
Hi Guys.

Is it possible to make one half of the sphere semi transparent?  When I do this by just passing in an alpha value in the fill() statement, I get some pretty bad artifacting and corruption which I think is related to normals.  Does anyone know how to how to create a two coloured 3D sphere, with one half being (semi) transparent?

thanks
Jim
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Cedric
Re: 3D sphere with two colors?
Reply #7 - Apr 11th, 2010, 4:58am  
you could add hint(ENABLE_DEPTH_SORT); in OPENGL mode to make it work correctly, but it really slows down your sketch. another way would be to use P3D, but you better turn of smooth for your sphere to make it look correct.



Code:

import processing.opengl.*;
import surface.calculation.*;
import surface.*;

Sphere s;

void setup(){
 size(500,500, P3D);
 s=new Sphere(g, 51,51);
 noStroke();
// smooth();
//hint(ENABLE_DEPTH_SORT);
}

void draw(){
 background(255);
 translate(width/2,height/2);
 rotateX(radians(frameCount));
 rotateY(radians(frameCount));
 s.setScale(mouseX);
 fill(58, 102, 132,100);
 s.drawPart(0,51,0,25);
 fill(125);
 s.drawPart(0,51,25,26);
 fill(102, 102, 0);
 s.drawPart(0,51,26,51);
}
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