From f9be2ace4ca871d7ad68c1a4dbdcff87511d838b Mon Sep 17 00:00:00 2001
From: Franklin Wei <me@fwei.tk>
Date: Thu, 30 May 2019 23:03:58 -0400
Subject: Add some useful stuff

---
 include/fml/quat.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'include/fml/quat.h')

diff --git a/include/fml/quat.h b/include/fml/quat.h
index 14c966e..67a89d5 100644
--- a/include/fml/quat.h
+++ b/include/fml/quat.h
@@ -15,11 +15,15 @@ namespace fml {
         quat(vec3 vec);
         quat();
 
-        operator vec3();
+        operator vec3() const;
 
         quat conjugate() const;
 
+        /* returns <cos / 2, x * sin / 2, y * sin / 2, z * sin / 2> */
         static quat from_angleaxis(scalar angle, vec3 axis);
+
+        /* returns rotquat * this * rotquat.conj */
+        quat rotateby(const quat &rotquat) const;
     };
 
     quat operator*(const quat &, const quat &);
-- 
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