Hello everybody,
I ask a suggestion to understand how to enlight a sphere in
the following way.
I want that the light of the sphere increases as the radious
increases (only the light of the sphere, in the image there
will be other objects).

I wrote the following code but I am not able to understand
which function (or better the right combination of lights)
to use to enlight the sphere.





/*------------------------------------------------------------------------------
----------*/
//Importing libraries
import processing.opengl.*;

/*------------------------------------------------------------------------------
----------*/

//GLOBAL VARIABLES

int size_window = 1000;//not an odd number


//Variables for the central sphere
boolean draw_sphere = true;//enable the drawig of the sphereINPUT PARAMETER
float c_s_radius;//the radius of the central sphere varies with a function (in order
               //radius_sphereradius_sphereto make the impression of vibration/pulsation
float c_s_angle = 0.;
float c_s_angle_increment = 1.;
float c_s_pulsation_step_size = 12.;//controls the velocity of the pulsation (INPUT PARAMETER)



/*------------------------------------------------------------------------------
----------*/


void setup() {

 size(size_window,size_window, OPENGL);
 hint(ENABLE_OPENGL_4X_SMOOTH);// Enable 4x oversampling (if supported)

}//end setup()


/*------------------------------------------------------------------------------
----------*/


void draw() {

 background(0);
 translate(width/2,height/2);//put the reference system in the centre

 
 define_lights();//global lights
 
 if(draw_sphere){//Draw the central sphere
   draw_central_sphere(size_window/48., size_window/36.);//NOTE: INPUT PARAMETERS to control the sizer of the sphere
 }

}//end draw()



/*------------------------------------------------------------------------------
----------*/
//Functions



void draw_central_sphere(float radius, float radius_offset){
 
 
 define_c_s_lights();//light of the sphere
   
 fill(255, 255, 255);//white sphere
 
 if (c_s_angle >= 360.){
   c_s_angle = 0.;  
 }
 
 c_s_radius = sin(radians(c_s_angle))*radius + radius_offset;
 
 noStroke();
 sphereDetail(100);
 sphere(c_s_radius);
 
 c_s_angle+= c_s_angle_increment*c_s_pulsation_step_size;
 

 
}//end draw_central_sphere()



void define_lights(){

 ambientLight(102, 102, 102);
 lightSpecular(204, 204, 204);
 directionalLight(102, 102, 102, 0, 0, -1);
 specular(255, 255, 255);
 
}//end define_line()




void define_c_s_lights(){
 
 shininess(5.0);
 emissive(0, 51, 102);//blu emissive light
 
}//end define_central_dphere_lights()





As you can see in the define_c_s_lights() function I tried with emissive() but I did not reach my objective.
So please help me!

Thanks in advance