# Physics Raycast Result Constructor Bug
**URL:** https://forum.babylonjs.com/t/physics-raycast-result-constructor-bug/7019
**Category:** Bugs
**Created:** [November 16, 2019, 1:18am UTC](https://forum.babylonjs.com/t/physics-raycast-result-constructor-bug/7019 "2019-11-16T01:18:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)
#### Post date: [November 16, 2019, 1:18am UTC](https://forum.babylonjs.com/t/physics-raycast-result-constructor-bug/7019/1 "2019-11-16T01:18:09Z")
When trying to construct a PhysicsRaycastResult class like so:
```auto
let hitResult:BABYLON.PhysicsRaycastResult = new BABYLON.PhysicsRaycastResult()
```
```auto
Uncaught TypeError: BABYLON.PhysicsRaycastResult is not a constructor
at TestController.update (WTFComp.ts:27)
at Function.n.BeforeInstance (babylon.manager.js:3)
at r._before [as callback] (babylon.manager.js:3)
at e.notifyObservers (babylon.min.js:16)
at t.render (babylon.min.js:16)
at index.html:312
at t._renderFrame (babylon.min.js:16)
at t._renderLoop (babylon.min.js:16)
```
Yo @Deltakosh … Are we missing a constructor on that class or what ???
---
### Author:  [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)
#### Post date: [November 16, 2019, 2:00am UTC](https://forum.babylonjs.com/t/physics-raycast-result-constructor-bug/7019/2 "2019-11-16T02:00:55Z")
I think you are not supposed to instantiate `PhysicsRaycastResult` yourself but instead use the `raycast` method of the physic engine of your choice, which will return a `PhysicsRaycastResult`.
---
### Author:  [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)
#### Post date: [November 16, 2019, 2:48am UTC](https://forum.babylonjs.com/t/physics-raycast-result-constructor-bug/7019/3 "2019-11-16T02:48:40Z")
I am doing native Ammo.js Raycast but wanted to wrap in an API like the PhysicsPlugin.raycast() function does… Which is use a PhysicsRaycastResult as a result buffer and re-using the result buffer each raycast then it update the point and normal hit data.
But now matter what… Somewhere you gotta instantiate an instance to work with.
I end up making my own updatable **BABYLON.RaycastHitResult** class for my SceneManager extension… I need a spot to store the native btCollisionObject anyways… Beside i also support collision filter groups and masks.