정육면체 그리기

 개요

 

 사각형을 이용해 정육면체 즉, 큐브를 그려보자

 코드

 

Colored By Color Scripter™

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#include <gl/glut.h>   GLfloat vertices[][3] = {     { -0.5, 0.5, -0.5 },      { -0.5, 0.5, 0.5 },      { 0.5, 0.5, 0.5 },      { 0.5, 0.5, -0.5 },      { -0.5, -0.5, -0.5 },      { -0.5, -0.5, 0.5 },      { 0.5, -0.5, 0.5 },      { 0.5, -0.5, -0.5 } };   GLfloat colors[][3] = {     { 1.0, 0.0, 0.0 },      // red       { 1.0, 1.0, 0.0 },      // yellow       { 0.0, 1.0, 0.0 },      // green       { 0.0, 0.0, 1.0 },      // blue       { 0.5, 0.5, 0.0 },      // gold     { 1.0, 0.0, 1.0 }        // magenta   };     void display(){         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);       glTranslatef(0.0f, 0.0f, 0.0f);     glRotatef(30, 1.0f, 0.0f, 0.0f);     glRotatef(30, 0.0f, 0.0f, 1.0f);       glBegin(GL_QUADS);       glColor3fv(colors[0]);     glVertex3fv(vertices[0]);     glVertex3fv(vertices[3]);     glVertex3fv(vertices[2]);     glVertex3fv(vertices[1]);       glColor3fv(colors[1]);     glVertex3fv(vertices[1]);     glVertex3fv(vertices[2]);     glVertex3fv(vertices[6]);     glVertex3fv(vertices[5]);       glColor3fv(colors[2]);     glVertex3fv(vertices[3]);     glVertex3fv(vertices[7]);     glVertex3fv(vertices[6]);     glVertex3fv(vertices[2]);       glColor3fv(colors[3]);     glVertex3fv(vertices[0]);     glVertex3fv(vertices[3]);     glVertex3fv(vertices[7]);     glVertex3fv(vertices[4]);       glColor3fv(colors[4]);     glVertex3fv(vertices[7]);     glVertex3fv(vertices[4]);     glVertex3fv(vertices[5]);     glVertex3fv(vertices[6]);       glColor3fv(colors[5]);     glVertex3fv(vertices[4]);     glVertex3fv(vertices[0]);     glVertex3fv(vertices[1]);     glVertex3fv(vertices[5]);       glEnd();            // End Drawing The Cube       glutSwapBuffers(); }     void Init(){       glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);     glutInitWindowSize(700, 700);     glutInitWindowPosition(0, 0);       glutCreateWindow("Cube");       glClearColor(1.0, 1.0, 1.0, 1.0);       glEnable(GL_DEPTH_TEST);   }   int main(int argc, char **argv){     glutInit(&argc, argv);       Init();       glutDisplayFunc(display);     glutMainLoop();       return 0; }

 결과

 

 참고

 

 glEnable(GL_DEPTH_TEST) 를 사용하지 않으면 어떤 도형이 화면과 가까운지 체크할 수 없어 앞면과 뒷면이 구분되지 않는 문제가 발생한다.