Turn on-off lighting effects

Thu Mar 08, 2012 1:05 pm

In this example you can turn on/off the light sources in the scene using keyboard handling function .

Code:: #include <iostream> #include <stdlib.h> #ifdef __APPLE__ #include <OpenGL/OpenGL.h> #include <GLUT/glut.h> #else #include <GL/glut.h> #endif using namespace std; //Called when a key is pressed void handleKeypress(unsigned char key, int x, int y) { switch(key){ case 'a': glDisable(GL_LIGHT0); break; case 's': glEnable(GL_LIGHT0); break; case 'd': glDisable(GL_LIGHT1); break; case 'f': glEnable(GL_LIGHT1); break; case 27: //Escape key exit(0); default: break; } glutPostRedisplay(); } //Initializes 3D rendering void initRendering() { glEnable(GL_DEPTH_TEST); glEnable(GL_COLOR_MATERIAL); glEnable(GL_LIGHTING); //Enable lighting glEnable(GL_LIGHT0); //Enable light #0 glEnable(GL_LIGHT1); //Enable light #1 glEnable(GL_NORMALIZE); //Automatically normalize normals //glShadeModel(GL_SMOOTH); //Enable smooth shading } //Called when the window is resized void handleResize(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0, (double)w / (double)h, 1.0, 200.0); } float _angle = -70.0f; //Draws the 3D scene void drawScene() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0f, 0.0f, -8.0f); //Add ambient light GLfloat ambientColor[] = {0.2f, 0.2f, 0.2f, 1.0f}; //Color (0.2, 0.2, 0.2) glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientColor); //Add positioned light GLfloat diffuseLightColor0[] = {1.0f, 1.0f, 1.0f, 1.0f}; GLfloat specularLightColor0[] = {1.0f, 1.0f, 1.0f, 1.0f}; GLfloat lightPos0[] = {1.0f, 1.0f, 0.0f, 1.0f}; //glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLightColor0); glLightfv(GL_LIGHT0, GL_SPECULAR, specularLightColor0); glLightfv(GL_LIGHT0, GL_POSITION, lightPos0); //Add directed light GLfloat lightColor1[] = {0.5f, 0.2f, 0.2f, 1.0f}; //Color (0.5, 0.2, 0.2) //Coming from the direction (-1, 0.5, 0.5) GLfloat lightPos1[] = {-1.0f, 0.5f, 0.5f, 0.0f}; glLightfv(GL_LIGHT1, GL_DIFFUSE, lightColor1); glLightfv(GL_LIGHT1, GL_POSITION, lightPos1); glRotatef(_angle, 0.0f, 1.0f, 0.0f); glColor3f(1.0f, 1.0f, 0.0f); glutSolidTeapot(2.0); glutSwapBuffers(); } void update(int value) { _angle += 1.5f; if (_angle > 360) { _angle -= 360; } glutPostRedisplay(); glutTimerFunc(25, update, 0); } int main(int argc, char** argv) { //Initialize GLUT glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(400, 400); //Create the window glutCreateWindow("Lighting Example"); initRendering(); //Set handler functions glutDisplayFunc(drawScene); glutKeyboardFunc(handleKeypress); glutReshapeFunc(handleResize); glutTimerFunc(25, update, 0); //Add a timer glutMainLoop(); return 0; }

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Turn on-off lighting effects

Turn on-off lighting effects

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