Shader graph : Convert world position effect to UV position

Hello all,

I'm currently working on a pixel dissolve shader for a game and I need some help to understand how can I mix between world position and object position...

This is what I want to achieve :
- Use a world position projection of a pixel noise to have the same size in all the scene and not be UV scale dependent. -
- But also use a UV node to get the blending coordinate from 0 to 1 depending of the sprite size

As you can see it work pretty well as long as I didn't move around in the scene...

This is what the shader looks like at the moment



Do you have any idea how can I blend between the two solutions ? :)

Thanks a lot !