shaderViewport movement isn't straight

I'm having this kind of issue. I zoomed through the shaderViewport into a scene. Now i want a slow camera zoom out effect. The problem is that the zoom out isn't straight movement - it goes to the right and back while zooming out which doesn't make any sense to me.

Setting the zoom:

shaderViewport(1.5, 315, 95, 0, 0, easeLinearInOut)

shaderViewport(1, 0, 0, 0, 2500, easeLinearInOut)

function shaderViewportInterpolationPoint(x,y) 

You can set it to 0.5,0.5, which will interpolate through the center position, default is 0,0 meaning the left top position.

I use it but nothing happens.

In the screenshot the execute script is: shaderZoom(1, 500, easing)

Shoudn't the easing be specified? Like easeLinarIn, easeQintOut ...

Could that be the problem?

Am I using the wrong function? 

i use fuction at begine of scene.

Check your spellings mate. easeLinarIn > easeLinearIn.

@Esmeralda: tsk tsk, I see it was you that told them the incorrect spellings.

Easings can be found here: https://easings.net/en but In, Out, InOut goes on the end & not where it says on that page. For example: easeInSine would be easeSineIn in Visionaire.

Thank you so much .

OK, it works.