How to move the object to the position of mouse(opengl) -


as title, trying gltranslate(). have know relation between window screen coordinates , opengl coordinate.

i mouse position in window screen coordinate glutmousefunc(). , according have found online, need function gluunproject() transfer window screen coordinate glutmousefunc() opengl coordinate.

the result correct without function glulookat() , glfrustum(). these 2 function, got complete wrong answers.

this initial setting:

glclear(gl_color_buffer_bit | gl_depth_buffer_bit ); glmatrixmode(gl_modelview); glloadidentity(); glulookat(1.9, 1.75, 1.7, 0.25, 0.25, 0.25, 0, 1, 0); glpolygonmode(gl_front_and_back, gl_line);/*show planes of polygon lines*/ glpointsize(20.0); glbegin(gl_points);     glvertex3f(0.5, 0.5, 0.5);     glvertex3f(0, 0, 0);     glvertex3f(0.25, 0.25, 0.25); glend(); glmatrixmode(gl_projection); glloadidentity(); glfrustum(-0.4, 0.4, -0.4, 0.4, 1.1, 10); glutswapbuffers();

in glutmousefunc(mouse):

void mouse(int button, int state, int mouse_x, int mouse_y){ if(button == glut_left_button && state == glut_down){     int viewport[4];     double modelview[16];     double projection[16];     double windowx,windowy,z_cursor;     double x,y,z;     glgetintegerv(gl_viewport, viewport);     glgetdoublev(gl_modelview_matrix, modelview);     glgetdoublev(gl_projection_matrix, projection);     windowx= (double)mouse_x;     windowy= (double)viewport[3]-(double)mouse_y;     glreadpixels(windowx, windowy, 1, 1, gl_depth_component, gl_float, &z_cursor);     gluunproject(windowx, windowy, z_cursor, modelview, projection, viewport, &x, &y, &z);     printf("%lf %lf %lf\n", x, y, z); } }

does know why errors happened , how fix it? or there way achieve goal "moving object position of mouse"?


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