Based upon rigid body dynamics and aerodynamics.

Collision uses collision convex volumes

Areodynamics uses an active planes for forces computation

Almost any model of aircraft can be simulated

Maximum terrain sector size: 2048x2048. Final size of sector file up to 1Mb (100*100 Kilometers of terrain is about 100Mb (with terrain detail 10 Meters))

Terrain block size: up to 32 map pixels

Terrain shaded with lightmaps. Terrain casts shadows.

Bump mapping

Terrain render uses Pixel Shaders, 4 texture stages: 1 - Light map; 2 * User defined textures; 3 - Generated grass\cliff\snow textures; 4 - User defined bump mapping

Unlimited count of trees and reasonable framerates (about 100 fps without water (Forest square is about 10*10 Kilometers)). Rendered with shadow maps. The size of result file does not depend upon quantity of trees. The engine uses 3 types of render techniques, which depend on optimization factor:

1st - detail trees render (sphere trees technique or tree models), distance 500m
2nd - imposter trees via VertexShader (integrated into VertexShader)+Bump map, distance 2Km
3rd - planar tree maps+Bump map, distance - unlimited

Dynamical sky lighting (24 hours), background cubemap support also.

Clouds. Use billboards.

Lakes. Uses offset bump mapping for fast computation. Dynamical reflection, transparency, specular highlights, fresnel effect as well.

Bump mapping with specular highlights

Of course, blended bones for animation

Uses PixelShaders

Shadow volumes computation via VertexShaders