Update orbit-camera.js

orbit-camera.js

@@ -579,7 +579,7 @@ OrbitCameraInputKeyboard.prototype.update = function (dt) {
         }
 
         // Pitch (up/down) — Shift+Up => orbit up, Shift+Down => down
-        var pitchDir = (up ? 1 : 0) - (dn ? 1 : 0); // up=+1, down=-1
+        var pitchDir = (up ? 0 : 1) - (dn ? 0 : 1); // up=+1, down=-1
         if (pitchDir !== 0) {
             var dPitch = pitchDir * this.orbitPitchSpeedDeg * dt;