How to improve my mini map in a 2.5D tile game?

[junqinglang]

Hi, I want to make the minimap like this: [158710-2020-05-06-18-46-16-crossgate召喚part0-youtube.png|158710]
The wall in the minimap only shows as a 1 unit rectangle block. The player will only show as a blinking point. and the floor keep the color.

Now I followed some tutorials on the Internet using a second camera implemented a mini-map like this:

It’s just a smaller version of the big map which is not expected. I googled a lot, but still no idea how to do this. The map is dynamically generated.

Any suggestions would be greatly appreciated!!!

Thank you!

[junqinglang]

After some research, I’m trying to use Shader to see if I can do it. But please if anybody has idea how to do this, let me know!