Plane - AABB intersection

Original Post

Mar 12, 2009 at 11:26 AM

Hi! I already looked at http://www.realtimerendering.com/intersections.html for a Plane - AABB intersection test, but I can't access any of the listed ones. My check would simply be to test if the eight vertices of the box lie on the same side of the plane. Does anyone know a better test? Best regards, Pudelmuetze

Zakwayda

Mar 12, 2009 at 12:00 PM

Quote:
Does anyone know a better test?

Yes, the 'separating axis test' (SAT).

In the case of an axis-aligned box and a plane, the SAT reduces to projecting the box onto the plane normal and comparing the projection to the plane distance (you'll often see this test expressed in terms of the box's 'n-vertex' and 'p-vertex').

The method is explained here, in the section titled 'Geometric Approach - Testing Boxes II'.

Pudelmuetze

Mar 12, 2009 at 12:29 PM

Thanks, it seems to work. :)

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