Ignore the collision box offset when launching projectiles (Fixes #3201)

apps/openmw/mwworld/projectilemanager.cpp

@@ -117,11 +117,13 @@ namespace MWWorld
                                             const ESM::EffectList &effects, const Ptr &caster, const std::string &sourceName,
                                             const osg::Vec3f& fallbackDirection)
     {
-        osg::Vec3f pos;
+        osg::Vec3f pos = caster.getRefData().getPosition().asVec3();
         if (caster.getClass().isActor())
-            pos = mPhysics->getCollisionObjectPosition(caster) + osg::Vec3f(0,0,mPhysics->getHalfExtents(caster).z() * 0.5); // Spawn at 0.75 * ActorHeight
-        else
-            pos = caster.getRefData().getPosition().asVec3();
+        {
+            // Spawn at 0.75 * ActorHeight
+            // Note: we ignore the collision box offset, this is required to make some flying creatures work as intended.
+            pos.z() += mPhysics->getHalfExtents(caster).z() * 2 * 0.75;
+        }
 
         if (MWBase::Environment::get().getWorld()->isUnderwater(caster.getCell(), pos)) // Underwater casting not possible
             return;