# Renderers disappear on Interaction Event
**URL:** https://discourse.vtk.org/t/renderers-disappear-on-interaction-event/7887
**Category:** Web
**Created:** [February 22, 2022, 9:09am UTC](https://discourse.vtk.org/t/renderers-disappear-on-interaction-event/7887 "2022-02-22T09:09:21Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@stoune](https://discourse.vtk.org/u/stoune)
#### Post date: [February 22, 2022, 9:09am UTC](https://discourse.vtk.org/t/renderers-disappear-on-interaction-event/7887/1 "2022-02-22T09:09:21Z")
Hello, I’m using in React, `ResliceCursorWidget` to get the locations in the brain slices on each `onEndInteractionEvent` and , at the same move a sphere (the red sphere) in other rendrer that display the vtk 3D of the brain, that sphere moves `onInteractionEvent` using :
```auto
v.widgetInstance.onInteractionEvent(()=> {
sphere3D.setCenter(widget.getWidgetState().getCenter(););
grw.getRenderWindow().render(); });
```
The code to get the locations that I display in the page:
```auto
const [locations, setLocations] = useState([]);
v.widgetInstance.onEndInteractionEvent(()=> {
const center = widget.getWidgetState().getCenter();
const origin = widget.getWidgetState().getImage().getOrigin();
const locations = [origin[0] - center[0], origin[1] - center[1], origin[2] - center[2]];
setLocations(locations);// this is the variable that I'm displaying in the page (X: Y: Z: )
});
```
The problem is after a few Reslice movements (5-6), all the renderes are disappeared and I get the error below,
PS: when I delete `onEndInteractionEvent` the problem is gone, when I move the code of the `onEndInteractionEvent` in `onInteractionEvent` the problem happens even more rapidly (after 2-3 manipulations)
I don’t understand what is the problem I really need help
---
### Author:  [@finetjul](https://discourse.vtk.org/u/finetjul)
#### Post date: [February 23, 2022, 3:33pm UTC](https://discourse.vtk.org/t/renderers-disappear-on-interaction-event/7887/2 "2022-02-23T15:33:25Z")
It seems that the problems comes from `setLocations()`.
What if you replace its current content with `console.log()`?
---
### Author:  [@dexter](https://discourse.vtk.org/u/dexter)
#### Post date: [February 23, 2022, 10:38pm UTC](https://discourse.vtk.org/t/renderers-disappear-on-interaction-event/7887/3 "2022-02-23T22:38:41Z")
If I replace it with `console.log()` or `React.useRef()` it works fine, I used` React.useRef()` to solve my problem