Add spot light to object
Fri Mar 09, 2012 1:35 pm
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
}
- Attachments
-
- Cube3D-Spot.png (13.86 KiB) Viewed 14009 times
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