?????? 視點跟蹤一個節點運動的原理是：把物體矩陣取反。。

#include <stdlib.h> #include <stdio.h> #include <gl/glut.h> #include <math.h> #include <time.h>GLfloat angle = 0.0; GLfloat theta = 0.0, vp = 6;//vp視點的位置GLfloat cenx, ceny;const int PI = 3.1415926; const double N = 200.0;int myWin; const int MAX_MAP = 500; int myMap[MAX_MAP][MAX_MAP];inline double aToR(double x) {return x/180.0 * 3.1415926; } void openLight() {float light_position[4] = {30, 30, 30, 0};float light_ambient[4] = {1.0, 1.0, 1.0, 1.0};float light_diffuse[4] = { 1.0, 1.0, 1.0, 1.0};glLightfv(GL_LIGHT0,GL_POSITION,light_position); glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient);glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);glEnable( GL_LIGHTING );glEnable( GL_LIGHT0 ); }void cube() {typedef float point3[3];typedef int edge[2];typedef int face[4];point3 vertices[8] = {{-1.0, -1.0, -1.0},{-1.0, -1.0, 1.0},{-1.0, 1.0, -1.0},{-1.0, 1.0, 1.0},{1.0, -1.0, -1.0},{1.0, -1.0, 1.0},{1.0, 1.0, -1.0},{1.0, 1.0, 1.0}};point3 normals[6] = {{-1.0, 0.0, 0.0},{0.0, 0.0, 1.0},{0.0, 1.0, 0.0},{0.0, 0.0, -1.0},{0.0, -1.0, 0.0},{1.0, 0.0, 0.0}};edge edges[24] = {{0, 1}, {1, 3}, {3, 2}, {2, 0},{0, 4}, {1, 5}, {3, 7}, {2, 6},{4, 5}, {5, 7}, {7, 6}, {6, 4},{1, 0}, {3, 1}, {2, 3}, {0, 2},{4, 0}, {5, 1}, {7, 3}, {6, 2},{5, 4}, {7, 5}, {6, 7}, {4, 6}};face cube[6] = {{0, 1, 2, 3}, {5, 9, 18, 13},{14, 6, 10, 19}, {7, 11, 16, 15},{4, 8, 17, 12}, {22, 21, 20, 23}};//GLdouble myClipPlane[] = {1.0, 1.0, 0.0, -1.0};//glClipPlane(GL_CLIP_PLANE0, myClipPlane);///glEnable(GL_DEPTH_TEST);//glEnable(GL_CLIP_PLANE0);glBegin(GL_QUADS);for(int face = 0; face < 6; face ++){glNormal3fv(normals[face]);for(int edge = 0; edge < 4; edge ++){glVertex3fv(vertices[edges[cube[face][edge]][0]]);}}glEnd();//glDisable(GL_CLIP_PLANE0); }void qumian() {glLineWidth(10);glBegin(GL_LINES);glVertex3f(40, 0, 0);glVertex3f(0, 20, 0);glEnd(); }void display(void) {glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glEnable(GL_DEPTH_TEST);glClearColor(0, 0, 0.5, 1);openLight();glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0, 0, 0, 0.0, 0.0, -1.0, 0.0, 1.0, 0.0);glTranslatef(0, 0, -12);//glTranslatef(0, -5, 0);glRotatef(-angle, 0.0, 0.0, 1.0);//glScalef(10, 10, 10);glPushMatrix();glRotatef(angle, 0.0, 0.0, 1.0);//glTranslatef(0, 5, 0);cube();glPopMatrix();glPushMatrix();glTranslatef(2, 2, -9);cube();glPopMatrix();glPushMatrix();glTranslatef(2, 3, -2);cube();glPopMatrix();glPushMatrix();glTranslatef(-1, 3, 2);cube();glPopMatrix();glutSwapBuffers();}void reshape(int w, int h) {int min = w < h?w:h;int cenx = w * 0.5;int ceny = h * 0.5;glViewport(cenx - min*0.5, ceny - min*0.5, (GLsizei)min, (GLsizei)min);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(60, 1, 0.1, 300.0);glutPostRedisplay(); }void iterationStep(void) {angle += 1.0;cenx = cos(angle / 180 * 3.14159) * vp + vp;ceny = sin(angle / 180 * 3.14159) * vp; }void animate(void) {iterationStep();glutPostRedisplay(); }int main ( int argc, char ** argv ) {glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); //這里必須使用雙緩沖區，雙緩沖區通過在后一個緩沖區里繪畫，并不停交換前后緩沖區（可見緩沖區），來產生平滑的動畫，使用雙緩沖區可以有效的預防閃爍。glutInitWindowSize(500, 500);glutInitWindowPosition(50, 50);myWin = glutCreateWindow("畫球");glutDisplayFunc(display);glutReshapeFunc(reshape);glutIdleFunc(animate);glutMainLoop(); }

????? 最終效果圖如下所示：

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