How Many Modifiers in Blender that YOU HAVE NEVER USED?
in this video I cover "UV project" Modifier, along with how to create simple bat signal effect using that.
check it out.
Video Link : https://youtu.be/g7Vx0bGRwKI
Attachments Below
Attachment | BatSignal_noDrivers :
here there is only bat-signal with volume, instead of using a cube and principal volume BSDF here I modify the volume to have a different look using math and vectors, here I did not set up any drivers to automatically sets itself correctly when you change the scale of the volume cube.
Attachment | BatSignal_Demo :
here you can find the Bat-Signal with drivers set up to match the scale of the cube. And lot more.

Attachment | Caustics :
water caustic effect, not 100% accurate but can be handy!

Attachment | Caustics :
caustics from stained glass. also used UV warp modifier!

Attachment | Tutorial_BatSignal_UV_Project_1 :
tutorial file!