使用Visual C ++在Opengl中创建3D球体

Question

我无法使用C ++中的OpenGL库函数glutSolidSphere（）创建简单的3D球体。这是我尝试过的：#include<GL/glu.h> void display() {     glClear(GL_COLOR_BUFFER_BIT);     glColor3f(1.0,0.0,0.0);     glLoadIdentity();     glutSolidSphere( 5.0, 20.0, 20.0);     glFlush(); } void myInit() {    glClearColor(1.0,1.0,1.0,1.0);     glColor3f(1.0,0.0,0.0);     glMatrixMode(GL_PROJECTION);     glLoadIdentity();     gluOrtho2D(0.0,499.0,0.0,499.0);     glMatrixMode(GL_MODELVIEW); } void main(int argc,char **argv) {     qobj = gluNewQuadric();     glutInit(&argc,argv);     glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);     glutInitWindowSize(500,500);     glutCreateWindow("pendulum");             glutDisplayFunc(display);     myInit();     glutMainLoop(); }

Answer 1

我不知道datenwolf的索引生成如何正确。但是我仍然发现他的解决方案相当明确。这是我经过一番思考后得到的：

inline void push_indices(vector<GLushort>& indices, int sectors, int r, int s) {

    int curRow = r * sectors;

    int nextRow = (r+1) * sectors;

    indices.push_back(curRow + s);

    indices.push_back(nextRow + s);

    indices.push_back(nextRow + (s+1));

    indices.push_back(curRow + s);

    indices.push_back(nextRow + (s+1));

    indices.push_back(curRow + (s+1));

}

void createSphere(vector<vec3>& vertices, vector<GLushort>& indices, vector<vec2>& texcoords,

             float radius, unsigned int rings, unsigned int sectors)

{

    float const R = 1./(float)(rings-1);

    float const S = 1./(float)(sectors-1);

    for(int r = 0; r < rings; ++r) {

        for(int s = 0; s < sectors; ++s) {

            float const y = sin( -M_PI_2 + M_PI * r * R );

            float const x = cos(2*M_PI * s * S) * sin( M_PI * r * R );

            float const z = sin(2*M_PI * s * S) * sin( M_PI * r * R );

            texcoords.push_back(vec2(s*S, r*R));

            vertices.push_back(vec3(x,y,z) * radius);

            push_indices(indices, sectors, r, s);

        }

    }

}