lighting problem

I have a problem in determining the source of lighting and destination of lighting
I have sun in my program I want to be a source of lighting and lighting focus in a specific place
can u edited to this code

void inta(){

		// Set lighting intensity and color
	GLfloat qaAmbientLight[]	= {0.2f, 0.2f, 0.2f, 1.0f};
	GLfloat qaDiffuseLight[]	= {0.8f, 0.8f, 0.8f, 1.0f};
	GLfloat qaSpecularLight[]	= {0.5f, 0.5f, 0.5, 1.0f};
	GLfloat qaLightPosition[]	= {-12.5f,5.0f, -4.0f, 1.0};
		// Set the light position
		glLightfv(GL_LIGHT0, GL_AMBIENT, qaAmbientLight);
			glLightfv(GL_LIGHT0, GL_DIFFUSE, qaDiffuseLight);
	glLightfv(GL_LIGHT0, GL_SPECULAR, qaSpecularLight);
	glLightfv(GL_LIGHT0, GL_POSITION, qaLightPosition);


void ss(){

// Set material properties;
	GLfloat qaBlack[] = {1.0f, 0.0f, 0.1f, 1.0f};
	GLfloat qaGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};
GLfloat qaWhite[] = {1.0, 1.0, 0.0, 0.0};
	glMaterialfv(GL_FRONT, GL_AMBIENT, qaWhite);
	glMaterialfv(GL_FRONT, GL_DIFFUSE, qaGreen);
glMaterialfv(GL_FRONT, GL_SPECULAR, qaWhite);
	glMaterialf(GL_FRONT, GL_SHININESS, 10.0);

//drow sun 
void drawCircle(double x, double y, double radius){
int i;
int triangleAmount = 20; //# of triangles used to draw circle
//GLfloat radius = 0.8f; //radius
double twicePi = 2.0f *3.14;
glColor3f(0.0f, 1.0f, 0.0f);
glVertex2f(x, y); // center of circle
for(i = 0; i <= triangleAmount;i++) {
x + (radius * cos(i * twicePi / triangleAmount)),
y + (radius * sin(i * twicePi / triangleAmount))

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