Add spot light to object

DrRakha

In this example we add spot light to a cube object . Spot light is positional and directional light.

Code:

#include <GL\glut.h>
#include <math.h>      // For math routines (such as sqrt & trig).
GLfloat xRotated, yRotated, zRotated;
GLdouble radius=4;
GLfloat qaBlack[] = {0.0, 0.0, 0.0, 1.0}; //Black Color
GLfloat qaGreen[] = {1.0, 0.0, 0.0, 1.0}; //Green Color
GLfloat qaWhite[] = {1.0, 1.0, 1.0, 1.0}; //White Color
GLfloat qaRed[] = {1.0, 0.0, 0.0, 1.0}; //Red Color

    // Set lighting intensity and color
GLfloat qaAmbientLight[]    = {0.1, 0.1, 0.1, 1.0};
GLfloat qaDiffuseLight[]    = {1, 1, 1, 1.0};
GLfloat qaSpecularLight[]    = {1.0, 1.0, 1.0, 1.0};
GLfloat emitLight[] = {0.9, 0.9, 0.9, 0.01};
GLfloat Noemit[] = {0.0, 0.0, 0.0, 1.0};
    // Light source position
GLfloat qaLightPosition[]    = {0, 0, 2, 1};
GLfloat qaLightDirection[]    = {1, 1, 1, 0};
GLfloat dirVector0[]={ 1.0, 0.0, 0.0, 0.0};

void display(void);
void reshape(int x, int y);
 
void idleFunc(void)
{
    
     
    display();
}
void initLighting()
{

    // Enable lighting
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);

     // Set lighting intensity and color
       glLightfv(GL_LIGHT0, GL_AMBIENT, qaAmbientLight);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, qaDiffuseLight);
    glLightfv(GL_LIGHT0, GL_POSITION, qaLightPosition);
    glLightfv(GL_LIGHT0, GL_SPECULAR, qaSpecularLight);
    ////////////////////////////////////////////////


     glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 30.0);// set cutoff angle
     glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dirVector0); 
     glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 1); // set focusing strength


}
void keyboard(unsigned char key, int x, int y)
{
    
     
     if (key == 'l' || key == 'L')  
    { 
          glEnable(GL_LIGHTING);
    }
    else if (key == 'd' || key == 'D')  
    { 
        glDisable(GL_LIGHTING);
    }

}

 
int main (int argc, char **argv)
{
    glutInit(&argc, argv); 
     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );
    glutInitWindowSize(350,350);
    glutCreateWindow("Cube3d Sphere");
    initLighting(); 

    xRotated = yRotated = zRotated = 0.0;
    
    glutIdleFunc(idleFunc);
    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard); // Register keyboard callback
    glutReshapeFunc(reshape);
    glutMainLoop();
    return 0;
}
 
void display(void)
{


    glMatrixMode(GL_MODELVIEW);
    // clear the drawing buffer.
    glClear(GL_COLOR_BUFFER_BIT);
    // clear the identity matrix.
    glLoadIdentity();
   
    glTranslatef(0.0,0.0,-20.0);


      // 
   glPushMatrix();
 
     
    glTranslatef(-3.0,0.0,0);
    // Set material properties
    glRotatef(30,0.0,1.0,0.0);
    glRotatef(30,0.0,0.0,1.0);
       glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, qaRed);

    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, qaRed);

     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, qaWhite);

     glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 20);
 
    glutSolidCube(radius);
     glPopMatrix();



      glPushMatrix();
 
     
    glTranslatef(5.0,0.0,0);
    // Set material properties
    glRotatef(30,0.0,1.0,0.0);
    glRotatef(30,0.0,0.0,1.0);
       glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, qaRed);

    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, qaRed);

     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, qaWhite);

     glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 20);
 
    glutSolidCube(radius);
     glPopMatrix();



    glPushMatrix();  
    glRotatef(yRotated,0.0,1.0,0.0);
     
    glLightfv(GL_LIGHT0, GL_POSITION, qaLightPosition);
 

    glPopMatrix(); 


    

    glFlush();
    glutSwapBuffers();      
   
}
 
void reshape(int x, int y)
{
    if (y == 0 || x == 0) return;   
    glMatrixMode(GL_PROJECTION);  
    glLoadIdentity(); 
    
    gluPerspective(39.0,(GLdouble)x/(GLdouble)y,0.6,40.0);
    glMatrixMode(GL_MODELVIEW);
    glViewport(0,0,x,y);  //Use the whole window for rendering
}
 
 

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Add spot light to object

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