1. Added a crush mechanism that deals damage to low-level enemy units. Damage is proportional to rank difference and speed change.
2. Colliding enemy units is different from friendly units, which have a similar effect of avoidance.
3. Increased the elevation damage bonus, with a maximum height difference of 20m and a linear change from 0.8 to 1.2.
4. Fixed a bug where the blood bar was displayed on the back of the camera
5. Added ambient shading effect and modified some materials.