occlusion

EXT_occlusion_query_boolean is new with OS5.0, it looks to me like not a single person on the entire internet has posted about these new extensions nor used this code.... so here they are set up properly...which is not documented anywhere as far as i can tell... you can imagine how they would go in your code from this little sudo code here: import UIKit/UIKit.h import GLKit/GLKit.h import "GLProgram.h" GLuint testBox,hasBeenTested,theParams; //... glGenQueriesEXT(1, &testBox); glBeginQueryEXT(GL_ANY_SAMPLES_PASSED_EXT, testBox); //... draw an object ....... glEndQueryEXT(GL_ANY_SAMPLES_PASSED

In my OpenGL program, I am doing the following in sequence: // Drawing filled polyhedrons // Drawing points using GL_POINTS // Displaying information for each above point beside it For displaying the point information (say a point identifier/number), I convert the 3D coordinates of the point to 2D window coordinates using gluProject (). I write the point identifier at that 2D window location using glRasterPos () and 2D character rendering code. When a rendered point is occluded by another primitive, it is automatically not displayed due to automatic occlusion test and depth test that happens