由於左眼和右眼觀看顯示器的角度不同，利用這一角度差遮住光線就可將圖像分配給右眼或者左眼，經過大腦將這兩幅由差別的圖像合成為一副具有空間深度和維度信息的圖像，從而可以看到3D圖像。
完整的實現代碼如下所示：
代碼如下：
#include "stdafx.h"
#include "GL/glut.h"
#include "stdlib.h"
#include "stdio.h"
#include "math.h"
static int big = 0;
static bool isLeftEye = false;
#define PI 3.1415926
const GLfloat R = 8.0;
static GLfloat leftMatrix[16] = {1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0};
static GLfloat rightMatrix[16] = {1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0};
static GLfloat leftPersMatrix[16] = {1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0};
static GLfloat rightPersMatrix[16] = {1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0};
void init(void)
{
const GLfloat SD = 0.06;
GLfloat n = SD*R/2.0;
//要是轉秩
//n=0;
leftMatrix[12] = n;
rightMatrix[12] = -n;
//這裡假設眼到屏幕為一米，以米為單位
GLfloat p = SD/(2*1*tan(PI/6)*1);
//p = 0.0;
leftPersMatrix[12] = -p;
rightPersMatrix[12] = p;
GLfloat mat_specular[] = {0.8, 0.8, 0.0, 1.0};
GLfloat mat_shininess[] = {50.0};
GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};
GLfloat white_light[] = {1.0, 1.0, 1.0, 1.0};
GLfloat yellow_light[] = {1.0, 1.0, 0.0, 1.0};
GLfloat lmodel_ambient[] = {0.0, 0.7, 0.5, 1.0};
glClearColor(1.0, 1.0, 1.0, 0.0);
glShadeModel(GL_SMOOTH);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glLightfv(GL_LIGHT0, GL_DIFFUSE, yellow_light);//主體的顏色
glLightfv(GL_LIGHT0, GL_SPECULAR, white_light);//高光的顏色
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_DEPTH_TEST);
}
void display(void)
{
glColorMask(1.0, 1.0,1.0,1.0);
glClearColor(0.0,0.0,0.0,1.0);
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1.0, 1.0, 1.0);
// 畫左眼
glMatrixMode(GL_PROJECTION);
glPushMatrix();
float mat[16];
glGetFloatv(GL_PROJECTION_MATRIX,mat);
glLoadIdentity();
glMultMatrixf(leftPersMatrix);
glMultMatrixf(mat);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glGetFloatv(GL_MODELVIEW_MATRIX,mat);
glLoadIdentity();
glMultMatrixf(leftMatrix);
glMultMatrixf(mat);
glColorMask(1.0, 0.0,0.0,1.0);
glRotatef((GLfloat) big, 0.0, 1.0, 0.0);
glutSolidTeapot(2.0);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glFlush();
//畫右眼
glClearDepth(1.0);
glClear(GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glGetFloatv(GL_PROJECTION_MATRIX,mat);
glLoadIdentity();
glMultMatrixf(rightPersMatrix);
glMultMatrixf(mat);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glGetFloatv(GL_MODELVIEW_MATRIX,mat);
glLoadIdentity();
glMultMatrixf(rightMatrix);
glMultMatrixf(mat);
glColorMask(0.0, 1.0,1.0,1.0);
glRotatef((GLfloat) big, 0.0, 1.0, 0.0);
glutSolidTeapot(2.0);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glFlush();
//glPopMatrix();
//if(isLeftEye)
//{
// glMatrixMode(GL_PROJECTION);
// glMultMatrixf(leftPersMatrix);
// glMatrixMode(GL_MODELVIEW);
// glMultMatrixf(leftMatrix);
// glColorMask(1.0, 0.0,0.0,1.0);
//
//
//
// isLeftEye = false;
//}else
//{
//
// glMatrixMode(GL_PROJECTION);
// glMultMatrixf(rightPersMatrix);
// glMatrixMode(GL_MODELVIEW);
// glMultMatrixf(rightMatrix);
// glColorMask(0.0, 1.0,1.0,1.0);
// isLeftEye = true;
//}
//glRotatef((GLfloat) big, 0.0, 1.0, 0.0);
//glutSolidTeapot(1.0);
//glRotatef((GLfloat) big, 0.0, 1.0, 0.0);
//glTranslatef(3.0, 0.0, 0.0);
//glutSolidTeapot(0.5);
glutSwapBuffers();
}
void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, (GLfloat)w/(GLfloat)h, 0.01, 20.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.0, 0.0, R, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0 );
}
void keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 'b':
big = (big + 1) % 360;
glutPostRedisplay();
break;
case 'B':
big = (big - 1) % 360;
glutPostRedisplay();
break;
case 27: // 按ESC鍵時退出程序
exit (0);
break;
default:
break;
}
}
void spinDisplay(void)
{
big = (big + 1) % 360;
glutPostRedisplay();
}
int main (int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutIdleFunc(spinDisplay);
glutMainLoop();
return 0;
}
最終效果圖如下所示：
