Create Math.md

lmj01 · May 20, 2022 · b6b1049 · b6b1049
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+# Math
+
+```js
+const vec3 = new Vector3();
+const quat = new Quaternion();
+vec3.applyQuaternion(quat);
+```
+本质是用四元数对向量进行旋转，即q'Vq