Allright, that points me to the right direction.

I did not use camera distance.

But how would the mathematical term be to calculate the correct scale for the pannel?

What do i need?

Height and width of the model, camera distance, height and width of the pannelbmap?

and how to calculate the correct scale for the bmap?
Assuming that the original of the bmap has the scale 1, how do i calculate the 0.xxx scale to fit for the model?

Hope u know what i wanna say.

Greetings

Mike