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-The term collision can be used to refer to <<jme3/advanced/physics_listeners#,physical interactions>> (where xref:physics:physics.adoc[physical objects] collide, push and bump off one another), and also to non-physical _intersections_ in 3D space. This article is about the non-physical (mathematical) collisions.
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+The term collision can be used to refer to xref:physics:collision/physics_listeners.adoc[physical interactions] (where xref:physics:physics.adoc[physical objects] collide, push and bump off one another), and also to non-physical _intersections_ in 3D space. This article is about the non-physical (mathematical) collisions.
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Non-physical collision detection is interesting because it uses less computing resources than physical collision detection. The non-physical calculations are faster because they do not have any side effects such as pushing other objects or bumping off of them. Tasks such as <<jme3/advanced/mouse_picking#,mouse picking>> are easily implemented using mathematical techniques such as ray casting and intersections. Experienced developers optimize their games by finding ways to simulate certain (otherwise expensive physical) interactions in a non-physical way.
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Non-physical collision detection is interesting because it uses less computing resources than physical collision detection. The non-physical calculations are faster because they do not have any side effects such as pushing other objects or bumping off of them. Tasks such as <<jme3/advanced/mouse_picking#,mouse picking>> are easily implemented using mathematical techniques such as ray casting and intersections. Experienced developers optimize their games by finding ways to simulate certain (otherwise expensive physical) interactions in a non-physical way.
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mitm001