AR opacity slider

Hi im new to unity and im trying to figure out how to create a slider that will blend transparency between two objects. so as the slider is set to 0 the first object will be shown, through the transition of the slider the first object will fade out and the second object will fade in.

Any thoughts on how to achieve this?

Many thanks

 

Have each model have their own material.
As you drag the slider from 0 to 1, tie the slider to the material alpha, then make material 1 be visible at 0, and invisible at 1, and reverse for the other object.
material.SetColor(1, 1, 1 <alphaValue>);
Remember to have each materials render mode set to Transparent and not Opaque!
This would mean that with the slider on 0.5, each object would be 50% transparent.