cross platform - OpenGL object not rotating -



cross platform - OpenGL object not rotating -

so, i've been trying rotate single object in opengl/glut environment. after going through several questions on , like, i've written appears right code, no dice. know how create work?

ps: i've tried changing glmatrixmode projection, shows black screen. same thing happens if utilize glloadidentity(). here's rendering code

void display() { preprocessevents(); glclear(gl_color_buffer_bit|gl_depth_buffer_bit); glloadidentity(); glulookat(camera::position.x, camera::position.y, camera::position.z, camera::position.x+math::sind(camera::rotationangles.x)*math::cosd(camera::rotationangles.y), camera::position.y+math::cosd(camera::rotationangles.x), camera::position.z+math::sind(camera::rotationangles.x)*math::sind(camera::rotationangles.y), 0.0, 1.0, 0.0); glbegin(gl_triangles); glcolor3f(1, 0, 0); glvertex3f(-1, 0,-3); glcolor3f(0, 1, 0); glvertex3f(0.0f, 2.0f,-3); glcolor3f(0, 0, 1); glvertex3f(1.0f, 0.0f,-3); glend(); glbindtexture(gl_texture_2d, tex->textureid); glbegin(gl_quads); glcolor3f(1, 1, 1); gltexcoord2f(100, 100); glvertex3f(100,0,100); gltexcoord2f(-100, 100); glvertex3f(-100,0,100); gltexcoord2f(-100,-100); glvertex3f(-100,0,-100); gltexcoord2f(100,-100); glvertex3f(100,0,-100); glend(); glbindtexture(gl_texture_2d, 0); object1.draw(); gltranslatef(-10.0, 10.0, 0.0); glbindtexture(gl_texture_2d, tex2->textureid); gluquadrictexture(quad,1); glusphere(quad,10,20,20); glbindtexture(gl_texture_2d, 0); //relevant code starts here glmatrixmode(gl_modelview); glloadidentity(); glpushmatrix(); glrotatef(190, 0.0, 0.0, 1.0); glpopmatrix(); glutswapbuffers(); }

are aware glpushmatrix , glpopmatrix do? save , restore "current" matrix.

by enclosing rotation in , doing no actual drawing operation before restoring matrix entire sequence of code origin //relevant code starts here pointless.

even if did not push/pop, rotation applied next time draw something. logically might think mean next time phone call display (...), 1 of first things in display (...) replace current matrix identity matrix (line 3).

in honesty, should consider abandoning whatever resource using larn opengl. using deprecated functionality , missing few fundamentals. opengl 3.0 tutorial touch on basics of transformation matrices.

as why changing matrix mode projection produces black screen, because next time phone call display (...), glulookat operates on projection matrix. in effect, wind applying photographic camera transformation twice. should add together glmatrixmode (gl_modelview) origin of display (...) avoid this.

opengl cross-platform glut glrotate

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