+/*
+ * Determine whether or not two vectors are mostly equal.
+ */
+INLINE_MAYBE
+bool vec_isequal2(vec_t a, vec_t b, scal_t epsilon)
+{
+ return scal_isequal2(a.x, b.x, epsilon) &&
+ scal_isequal2(a.y, b.y, epsilon) &&
+ scal_isequal2(a.z, b.z, epsilon) &&
+ scal_isequal2(a.w, b.w, epsilon);
+}
+
+/*
+ * Determine if one vector is "less than" another, for purposes of sorting.
+ */