Galaxy Engine 1.9.0 Beta 1

This beta update includes upcoming features like AVX2 optimizations for the fluids, Naive Gravity and multiple smaller changes.

Changelog:

• Optimized fluid simulations with AVX2 (might not activate on all computers)

• Made overall optimizations to fluid simulation

• Added Naive Gravity simulation with AVX2

• Removed Density Radius slider

• Added domain friction for fluid mode

• Set minimum particle size to 0