How can i create script that spread color from one point to the entire part’s surface

Im trying to make script that make color spread from one point to the entire part surface.

The issue is i have no idea how can i start.

I was trying to search on forum and other source. They said use other part and put tween size on it. But somehow that wont work on circle surface

It’s sphere btw

Are you trying to make an arch over the user or is this a sphere?

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Sphere around around the player and it will start to spread from a point on sphere.

I’d create the hemisphere first, just how you want it over the player.
In order to get the effect you want, I’d have it rotated 180 degrees (so it is under the player) then you can tween the orientation to get it fully over the player

How about this guy how did he make the black triangle start appear from one side.
https://youtu.be/C3b3bhuHUBA

Looks to me like he may be using particles on either an invisible part that’s moving or something of the sort