-USING: arrays kernel math math.functions math.order math.vectors
-namespaces opengl opengl.gl sequences ui ui.gadgets ui.gestures
-ui.gadgets.worlds ui.render accessors combinators literals ;
+USING: accessors combinators kernel literals math math.functions
+math.order math.vectors namespaces opengl opengl.gl sequences
+ui.gadgets ui.gadgets.worlds ui.gestures ;
IN: opengl.demo-support
CONSTANT: FOV $[ 2.0 sqrt 1 + ]