Right now, I am trying to code a survival game. The game needs a explosion fire effect that happens when the player fires a rocket from a rocket launcher and I am trying to code it. The fire is a illuminating object. Any recommendations to make it realistic?

I want a method to code a realistic engine plumes that behaves similar to the BE-3s or any solid rocket motor that has a gradient from transparent to blue and to yellow with the cool fluttering effect.

I am currently building a game called Realistic Spaceflight 3D which is a 3D game like KSP2 just with realism overhaul. In this game, I want the engines to have the realistic engine plume just like the KSP RO plumes.

I want a logic for how the game should render the same plume texture file at different altitudes to give the plume expansion effect as well as logic which changes the opacity based on altitude. Thanks in advance.