How to make a certain percent of a block transparent?

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1

I’m trying to make it for that a certain percent of a part is transparent, while the other percent isn’t. I first thought of tweening the transparency but that only tweens how much its transparent, not what percent is.
image

In the picture above I’m trying to make it so that the remainder of the block sticking out of the transparent part will be visible, while the percent of it inside of the transparent block will be transparent. Any help would be appreciated!

3

What you are saying is not directly doable, but there are a few workarounds.
For example you could use another part, and resize both parts to create an effect like you want.
Also, you can use surfaceguis to make a percentage (for example 50% means a framesize of 0.5) visible, while the part itself is transparent.

But an easy solution is not available I think!