graphics - Placing the camera position inside cube in openGl -


i trying create 3d room. doing creating 3d cube , trying changing camera position inside cube appears room. when make coordinate vertices 3 instead of 1 works 1 doesn't work. why did happen?

my code cube :

glbegin(gl_quads);        // draw cube using quads glvertex3f(1.0f, 1.0f, -1.0f);    // top right of quad (top) glvertex3f(-1.0f, 1.0f, -1.0f);    // top left of quad (top) glvertex3f(-1.0f, 1.0f, 1.0f);    // bottom left of quad (top) glvertex3f(1.0f, 1.0f, 1.0f);    // bottom right of quad (top) glvertex3f(1.0f, -1.0f, 1.0f);    // top right of quad (bottom) glvertex3f(-1.0f, -1.0f, 1.0f);    // top left of quad (bottom) glvertex3f(-1.0f, -1.0f, -1.0f);    // bottom left of quad (bottom) glvertex3f(1.0f, -1.0f, -1.0f);    // bottom right of quad (bottom) glvertex3f(1.0f, 1.0f, 1.0f);    // top right of quad (front) glvertex3f(-1.0f, 1.0f, 1.0f);    // top left of quad (front) glvertex3f(-1.0f, -1.0f, 1.0f);    // bottom left of quad (front) glvertex3f(1.0f, -1.0f, 1.0f);    // bottom right of quad (front) glvertex3f(1.0f, -1.0f, -1.0f);    // top right of quad (back) glvertex3f(-1.0f, -1.0f, -1.0f);    // top left of quad (back) glvertex3f(-1.0f, 1.0f, -1.0f);    // bottom left of quad (back) glvertex3f(1.0f, 1.0f, -1.0f);    // bottom right of quad (back) glvertex3f(-1.0f, 1.0f, 1.0f);    // top right of quad (left) glvertex3f(-1.0f, 1.0f, -1.0f);    // top left of quad (left) glvertex3f(-1.0f, -1.0f, -1.0f);    // bottom left of quad (left) glvertex3f(-1.0f, -1.0f, 1.0f);    // bottom right of quad (left) glvertex3f(1.0f, 1.0f, -1.0f);    // top right of quad (right) glvertex3f(1.0f, 1.0f, 1.0f);    // top left of quad (right) glvertex3f(1.0f, -1.0f, 1.0f);    // bottom left of quad (right) glvertex3f(1.0f, -1.0f, -1.0f);    // bottom right of quad (right) glend();

and using glulookat(0.0,0.0,0.0,0.0,0.0,-1.0,0.0,1.0,0.0);

i'm assuming you're using perspective projection , near plane greater one. lead following scenario geometry behind near plane , gets clipped:

enter image description here

simply reduce near plane 0.1 example. make sure not make small while far plane big, or you'll lose depth precision , hit "z fighting" issues.


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