This Environmental VFX Mega pack contains 90+ Unique different Niagara Particle systems, powerful post process materials that can be easily used in your games. All these effects are highly customizable. These collections can be categorized as Weather Effects, post process screen effects, flocking VFX and falling leaves pack. 

Preview

Falling Leaves Preview and Tutorial

Weather Effects Preview

Flock Tutorial

Includes:

9 Different Example Maps

• DemoLevel Screen Effects
• Flock Demo Map
• Flock Demo Map 2
• Mist Level
• Rain Level
• Sand Level
• Snow Level
• Falling Leaves Demo Map
• DemoMap_01 for all demonstrations

Documentation : Link