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--- guides:tips-on-quaternion [2020/04/23 09:30] – vjraymon
+++ guides:tips-on-quaternion [2020/04/23 18:44] – vjraymon
@@ Line 4: / Line 4: @@
 Assuming the local axis Y of the building is vertical (most cases),
-a way to compute the cosinus (named "cosp") and sinus (named "sinp") of the rotation angle of the building around the vertical is the following:
+a way to compute the cosinus (named ''cosp'') and sinus (named ''sinp'') of the rotation angle of the building around the vertical is the following:
 <code lua>
@@ Line 12: / Line 12: @@
 </code>
-Note: You can check that cosp*cosp + sinp*sinp is near 1
+Note:
+) You can check that ''cosp''*''cosp'' + ''sinp''*''sinp'' is near 1
+) This can be used, for instance, to convert a local direction on XZ plane (local coordonates for "translate"), to a global direction (global coordonates for "rayCast").