use GLKBased calculation

darkalfx · Dec 28, 2019 · 147f309 · 147f309
1 parent 186e1a2
commit 147f309
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Showing 2 changed files with 4 additions and 9 deletions.
diff --git a/Sources/VRMSceneKit/Extensions/SCNQuaternion+.swift b/Sources/VRMSceneKit/Extensions/SCNQuaternion+.swift
@@ -8,15 +8,6 @@
 
 import SceneKit
 
-func * (left: SCNQuaternion, right: SCNQuaternion) -> SCNQuaternion {
-    SCNQuaternion(
-        left.w * right.w - left.x * right.x - left.y * right.y - left.z * right.z,  // 1
-        left.w * right.x + left.x * right.w + left.y * right.z - left.z * right.y,  // i
-        left.w * right.y - left.x * right.z + left.y * right.w + left.z * right.x,  // j
-        left.w * right.z + left.x * right.y - left.y * right.x + left.z * right.w   // k
-    )
-}
-
 /*
  x, y, and z represent the imaginary values.
  */

diff --git a/Sources/VRMSceneKit/Extensions/SceneKit+.swift b/Sources/VRMSceneKit/Extensions/SceneKit+.swift
@@ -132,6 +132,10 @@ extension SCNQuaternion {
         }
     }
 
+    static func * (_ left: SCNQuaternion, _ right: SCNQuaternion) -> SCNQuaternion {
+        SCNQuaternionMultiply(left, right)
+    }
+
     static func * (_ left: SCNQuaternion, _ right: SCNVector3) -> SCNVector3 {
         SCNQuaternionRotateVector3(left, right)
     }