box: cull frustum with aabb helper

README.md

@@ -64,7 +64,8 @@ I realized that floating point errors may occur is some operaitons especially de
 - euler angles / yaw-pitch-roll to matrix
 - extract euler angles
 - inline or pre-compiled function call
-- extract view frustum planes
+- frustum (extract view frustum planes, corners...)
+- bounding box  (AABB in Frustum (culling), crop, merge...)
 
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