Force used to applyImpulse is now scaled with mass

In Oimo, the mass is not directly set. The force used to move this object should be scaled by the mass of the object.

Babylon/Physics/Plugins/babylon.oimoJSPlugin.ts

@@ -229,7 +229,10 @@ module BABYLON {
             for (var index = 0; index < this._registeredMeshes.length; index++) {
                 var registeredMesh = this._registeredMeshes[index];
                 if (registeredMesh.mesh === mesh || registeredMesh.mesh === mesh.parent) {
-                    registeredMesh.body.body.applyImpulse(contactPoint.scale(OIMO.INV_SCALE), force.scale(OIMO.INV_SCALE));
+                    // Get object mass to have a behaviour similar to cannon.js
+                    var mass = registeredMesh.body.body.massInfo.mass;
+                    // The force is scaled with the mass of object
+                    registeredMesh.body.body.applyImpulse(contactPoint.scale(OIMO.INV_SCALE), force.scale(OIMO.INV_SCALE*mass));
                     return;
                 }
             }
@@ -345,4 +348,4 @@ module BABYLON {
             }
         }
     }
-}
+}