绘制NURBS曲面.rar_NURBS c++_NURBS 曲面_nurbs_nurbs曲面_图形学曲面

#include "glos.h" #include <GL/gl.h> #include <GL/glaux.h> #include "windows.h" void myinit(void); void CALLBACK display(void); void CALLBACK reshape(GLsizei w,GLsizei h); //定义一组控制点的存储空间 GLfloat points[4][4][3]; //定义一个指向NURBS曲面对象的指针 GLUnurbsObj *theNurb; //用来生成控制点的过程，取代被注释掉的原来直接赋值方式生成控制点 void init_surface(void) { int u,v; for(u=0;u<4;u++) { for(v=0;v<4;v++) { points[u][v][0]=2.0*((GLfloat)u-1.5); points[u][v][1]=2.0*((GLfloat)v-1.5); if((u==1||u==2)&&(v==1||v==2)) points[u][v][2]=3.0; else points[u][v][2]=-3.0; } } } /* GLfloat points[4][4][3]={ {{-1.5,-1.5,2.0},{-0.5,-1.5,4.0}, {0.5,-1.5,3.0},{1.5,-1.5,2.0}}, {{-1.5,-0.5,3.0},{-0.5,1.5,4.0}, {0.5,0.5,2.0},{1.5,-0.5,-1.0}}, {{-1.5,0.5,2.0},{-0.5,0.5,4.0}, {0.5,0.5,5.0},{1.5,-1.5,1.5}}, {{-1.5,1.5,-2.0},{-0.5,1.5,3.0}, {0.5,0.5,1.0},{1.5,1.5,-1.0}}}; */ GLfloat color[4][3]={ {1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},{1.0,1.0,1.0}}; void initlights(void) { GLfloat ambient[]={0.4,0.6,0.2,1.0}; GLfloat position[]={0.0,1.0,3.0,1.0}; GLfloat mat_diffuse[]={0.2,0.4,0.8,1.0}; GLfloat mat_specular[]={1.0,1.0,1.0,1.0}; GLfloat mat_shininess[]={80.0}; glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glLightfv(GL_LIGHT0,GL_AMBIENT,ambient); glLightfv(GL_LIGHT0,GL_POSITION,position); glMaterialfv(GL_FRONT,GL_DIFFUSE,mat_diffuse); glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular); glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess); //首先初始化控制点 init_surface(); //创建一个NURBS曲面的对象 theNurb=gluNewNurbsRenderer(); //修改此曲面对象的属性 gluNurbsProperty(theNurb,GLU_SAMPLING_TOLERANCE,25.0); gluNurbsProperty(theNurb,GLU_DISPLAY_MODE,GLU_FILL); } void myinit(void) { auxInitDisplayMode(AUX_SINGLE|AUX_RGBA); auxInitPosition(0,0,500,500); auxInitWindow("sample1"); glClearColor(0.0,0.0,0.0,0.0); glClear(GL_COLOR_BUFFER_BIT); glMap2f(GL_MAP2_VERTEX_3,0,1,3,4,0,1,12,4,&points[0][0][0]); glEnable(GL_MAP2_VERTEX_3); glEnable(GL_AUTO_NORMAL); glEnable(GL_NORMALIZE); glMapGrid2f(20,0.0,1.0,20,0.0,1.0); glEnable(GL_DEPTH_TEST); initlights(); // glShadeModel(GL_FLAT); } void CALLBACK reshape(GLsizei w,GLsizei h) { glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if(w<=h) glOrtho(-5.0,5.0,-5.0*(GLfloat)h/(GLfloat)w, 5.0*(GLfloat)h/(GLfloat)w,-5.0,5.0); else glOrtho(-5.0*(GLfloat)h/(GLfloat)w, 5.0*(GLfloat)h/(GLfloat)w,-5.0,5.0,-5.0,5.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void CALLBACK display(void) { //B样条曲面（NURBS）的控制向量，可以参阅图形学的相关书籍 GLfloat knots[8]={0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0}; glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glColor3f(0.0,0.0,1.0); glPushMatrix(); glRotatef(35.0,1.0,1.0,1.0); glRotatef(-60.0,1.0,0.0,0.0); glScalef(0.5,0.5,0.5); //注释掉原来的曲面绘制函数，代之以新的NURBS曲面绘制函数 // glEvalMesh2(GL_FILL,0,20,0,20); //定义曲面的数学模型，确定其形状 gluNurbsSurface(theNurb, 8,knots, 8,knots, 4*3, 3, &points[0][0][0], 4,4, GL_MAP2_VERTEX_3); //结束曲面的绘制，此结构很类似于标准的glBegin()...glEnd() gluEndSurface(theNurb); int i,j; glPointSize(4.0); glBegin(GL_POINTS); for(i=0;i<4;i++) for(j=0;j<4;j++) { glColor3fv(color[i]); glVertex3fv(&points[i][j][0]); } glEnd(); glPopMatrix(); glFlush(); } void main(void) { myinit(); auxReshapeFunc(reshape); auxMainLoop(display); }