In the photos you can see that I’ve set up a selection script for my RTS game using a projector that i can toggle on/off, it works fine, but when below a certain angle the projection goes away/is invisible. I’m using the basic light shader provided by unity with a custom texture. In the photo you can see that i’ve selected both the houses and the small unit, but ingame it doesn’t show that the unit is selected.
[70879-skærmbillede-2016-05-27-kl-094002.png|70879]
Hello Endrit 
A way to fix your problem is to use the textures build in aniso level. Aniso level is a great feature that allows better rendering of textures at slim angles but at a cost of performance. This is great for roads and other floor textures.
You get this option in the texture inspector if you choose bilinear in stead of point under the filter option. The higher aniso level the better it will look. Remember to turn the anitrophic filtering on in the quality settings.
Another way would be to use different kind of indicator on the smallest objects.
Hope this helps
Holger