opengl中的剪裁变换

#include "windows.h" #include <GL/gl.h> #include <GL/glu.h> #include <GL/glaux.h> #pragma comment(lib,"opengl32") #pragma comment(lib,"glaux") #pragma comment(lib,"glu32") void myinit(void); void CALLBACK myReshape(GLsizei w, GLsizei h); void CALLBACK display(void); void CALLBACK display(void) { GLdouble eqn[4] = {1.0, 0.0, 0.0, 0.0}; glClear(GL_COLOR_BUFFER_BIT); glColor3f (1.0, 0.0, 1.0); glPushMatrix(); glTranslatef (0.0, 0.0, -5.0); /* clip the left part of wire_sphere : x<0 */ glClipPlane (GL_CLIP_PLANE0, eqn); //截平面 glEnable (GL_CLIP_PLANE0); //开启截平面 glRotatef (-90.0, 1.0, 0.0, 0.0); auxWireSphere(1.0); glPopMatrix(); glFlush(); } void myinit (void) { glShadeModel (GL_FLAT); } void CALLBACK myReshape(GLsizei w, GLsizei h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0); glMatrixMode(GL_MODELVIEW); } void main(void) { auxInitDisplayMode (AUX_SINGLE | AUX_RGB); auxInitPosition (0, 0, 500, 500); auxInitWindow ("Arbitrary Clipping Planes"); myinit (); auxReshapeFunc (myReshape); auxMainLoop(display); }