how to hide a part or change it's scale in game?

U may place the lights on pistons , and set the pistons' speed to very high.

@pedro16797 thanks

@sujun there's one way, but I've never used it, I'll test it out later and send you the results

@pedro16797 for example a hud can display the hight of the craft. However, I wanted to hide the extra light, instead of turning it off .
For another example, a hud requires a directional display, but this will keep some parts outside the hud, which I want to hide

Can you explain a bit more how is the hud going to be?

@pedro16797 could you help me if you are free

i think i can add a camera modifier in the parts because camera can hide itself，but i don't know what todo