Ply文件读取OpenGL显示

#include "ply.h" void plyloaddraw::load(char* filename) { printf("Loading %s...\n",filename); char* pch = strstr(filename,".ply"); if (pch != NULL) //检查该文件是否是.ply文件 { FILE* file = fopen(filename,"r"); //以只读方式打开file if (!file) //如果file不存在则执行if内部语句 { printf("load PLY file %s failed\n",filename); } fseek(file,0,SEEK_END); //把文件内部指针移到末尾，offset为0，故指针停在文件末尾处 long fileSize = ftell(file); //记录文件长度，file指针相对于文件首的偏移量 fseek(file,0,SEEK_SET); //指针移到文件开头位置 if (file) { char buffer[1000]; fgets(buffer,300,file); //读取ply中数据,每次读一行到buffer中. while ( strncmp( "element vertex", buffer,strlen("element vertex")) != 0 )//读取的这一行如果没有element vertex字符串，则继续读下一行，若有则跳出循环进行处理 { fgets(buffer,300,file); } strcpy(buffer, buffer+strlen("element vertex")); //把是vertex的那一行的后面的点的总数记录下来 sscanf(buffer,"%d", &totalver); //从buffer中读数据，以十进制的形式存到vertexlist中 //sscanf(buffer,"%d", &totalnor); fseek(file,0,SEEK_SET); while ( strncmp( "element face", buffer,strlen("element face")) != 0 ) { fgets(buffer,300,file); } strcpy(buffer, buffer+strlen("element face")); sscanf(buffer,"%d", &totaltri); while ( strncmp( "end_header", buffer,strlen("end_header")) != 0 ) { fgets(buffer,300,file); } for (int iterator = 0; iterator < totalver; iterator++) { fgets(buffer,300,file); vertexnum temp; sscanf(buffer,"%f %f %f ", &temp.x, & temp.y, & temp.z); //cout<<temp.x<<" "<<temp.y<<" "<<temp.z<<"\n"; vertexlist.push_back(temp); } for (int iterator = 0; iterator < totaltri; iterator++) { fgets(buffer,300,file); if (buffer[0] == '3') { trinum tempt; int num; sscanf(buffer,"%d %d\t%d\t%d",&num,& tempt.x,&tempt.y,&tempt.z ); trilist.push_back(tempt); } } float a[3]={0,0,0},b[3]={0,0,0},n[3]={0,0,0}; for (int nor = 0; nor < totaltri; nor++) { // glVertex3f(vertexlist[trilist[nor].x].x,vertexlist[trilist[nor].x].y,vertexlist[trilist[nor].x].z); // glVertex3f(vertexlist[trilist[nor].y].x,vertexlist[trilist[nor].y].y,vertexlist[trilist[nor].y].z); // glVertex3f(vertexlist[trilist[nor].z].x,vertexlist[trilist[nor].z].y,vertexlist[trilist[nor].z].z); nornum norm; /* a[3]=0; b[3]=0; n[3]=0;*/ a[0]=vertexlist[trilist[nor].y].x-vertexlist[trilist[nor].x].x; a[1]=vertexlist[trilist[nor].y].y-vertexlist[trilist[nor].x].y; a[2]=vertexlist[trilist[nor].y].z-vertexlist[trilist[nor].x].z; b[0]=vertexlist[trilist[nor].z].x-vertexlist[trilist[nor].x].x; b[1]=vertexlist[trilist[nor].z].y-vertexlist[trilist[nor].x].y; b[2]=vertexlist[trilist[nor].z].z-vertexlist[trilist[nor].x].z; n[0]=a[1]*b[2]-a[2]*b[1]; n[1]=a[2]*b[0]-a[0]*b[2]; n[2]=a[0]*b[1]-a[1]*b[0]; //cout<<a[0]<<"\n"; float d=sqrt(pow(n[0],2)+pow(n[1],2)+pow(n[2],2)); norm.x=n[0]/d; //cout<<norm.x<<"\n"; norm.y=n[1]/d; norm.z=n[2]/d; norlist.push_back(norm); } fclose(file); printf("%s Loaded!\n",filename); } else { printf("File can't be opened\n"); } } else { printf("File does not have a .PLY extension. "); } } //vassist void plyloaddraw::draw() { glColor3f(0,1,0); //glPointSize(1.8); glPolygonMode(GL_FRONT_AND_BACK,GL_LINE); glBegin(GL_TRIANGLES); int i; for (i=0;i<totaltri;i++) { //glNormal3f(norlist[i].x,norlist[i].y,norlist[i].z); glVertex3f(vertexlist[trilist[i].x].x,vertexlist[trilist[i].x].y,vertexlist[trilist[i].x].z); glVertex3f(vertexlist[trilist[i].y].x,vertexlist[trilist[i].y].y,vertexlist[trilist[i].y].z); glVertex3f(vertexlist[trilist[i].z].x,vertexlist[trilist[i].z].y,vertexlist[trilist[i].z].z); } glEnd(); }