Is there a way of figuring if an object is visible or not ?

rodzilla · 2002-01-10T19:23:51

Hi ! I''m looking for a fast way of knowing if an object is visible in an opengl scene or not. An easy method for me would be : - select a vectex in the object (the one I wanna see) when drawing the object and getting its coordinates on the screen and its depth (after the object has been drawn). - draw the rest of the scene. - query the depth buffer to know if another object hides the vertex I selected. So is it possible to - compute the screen coordinates of a vertex from its coordinates (using the current matrix) ? - query the depth-buffer ? Thanx a lot in advance. Rod.

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Started by rodzilla January 10, 2002 03:33 AM

9 comments, last by rodzilla 23 years, 1 month ago

feagle814

122

January 10, 2002 07:23 PM

Don''t forget to transform world coordinates to screen coordinates before reading pixels...

That''s done by running your coordinates through your two matrices.

Is there a way of figuring if an object is visible or not ?

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Is there a way of figuring if an object is visible or not ?

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