How to achieve this bitmap look

[FernandoLobina]

Can anyone share any advice on how to achive this bitmap/dither look that makes use of different shapes. is this done manually? any guidance would be apprecaited! 

[ZooN_]

The transition between the neighbouring colours in your example is called a halftone pattern effect. I'm not sure if Illustrator can convert gradients to vector halftone patterns but Astute Graphics has a plugin that can do that for you. Unfortunately it is not free.

[ZooN_]

https://astutegraphics.com/plugins/phantasm

[Monika Gause]

Probably the plugin Phantasm with its halftone effect can give you this result.

But it can also be achieved using patterns