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    <p>glScissor won't do what you want. Here is part of some code I wrote a while ago. It draws a rectangle with a grating texture and uses the stencil buffer to only have a disk visible.</p> <p>Here is the link I used back then: <a href="http://www.swiftless.com/tutorials/opengl/basic_reflection.html" rel="nofollow">http://www.swiftless.com/tutorials/opengl/basic_reflection.html</a></p> <pre><code>(let ((cnt 0d0)) (defmethod display ((w window)) ;; the complex number z represents amplitude and direction ;; of the grating constant ;; r and psi addresses different points in the back focal plane ;; r=0 will result in z=w0. the system is aligned to illuminate ;; the center of the back focal plane for z=w0. (let* ((w0 (* 540d0 (exp (complex 0d0 (/ pi 4d0))))) (r 260d0) (psi 270d0) (w (* r (exp (complex 0d0 (* psi (/ pi 180d0)))))) (z (+ w w0))) (clear-stencil 0) (clear :color-buffer-bit :stencil-buffer-bit) (load-identity) ;; http://www.swiftless.com/tutorials/ ;; opengl/basic_reflection.html ;; use stencil buffer to cut a disk out of the grating (color-mask :false :false :false :false) (depth-mask :false) (enable :stencil-test) (stencil-func :always 1 #xffffff) (stencil-op :replace :replace :replace) (draw-disk 100d0 (* .5d0 1920) (* .5d0 1080)) ;; center on camera 549,365 ;; 400 pixels on lcos = 276 pixels on camera (with binning 2) (color-mask :true :true :true :true) (depth-mask :false) (stencil-func :equal 1 #xffffff) (stencil-op :keep :keep :keep) ;; draw the grating (disable :depth-test) (with-pushed-matrix (translate (* .5 1920) (* .5 1080) 0) (rotate (* (phase z) 180d0 (/ pi)) 0 0 1) (translate (* -.5 1920) (* -.5 1080) 0) (draw *bild*)) (disable :stencil-test) (enable :depth-test) (fill-grating *grating* (abs z)) (format t "~a~%" cnt) (if (&lt; cnt 360d0) (incf cnt 30d0) (setf cnt 0d0)) (update *bild*) (swap-buffers) (sleep (/ 1d0)) ;; 1 frame per second (post-redisplay)))) </code></pre>
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    1. COthank you very much for the answer, i will take a look!
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