Scene Simulation for a New Type of Armored Equipment Simulator - Advances in Image and Graphics Technologies - page 225

2 Design of Scene Generation System

2.1 Scene Software

The scene is created by using advanced engine software, the operating system is
Win7. In the scene, the vegetation, roads and building is presented by 3D model.
(1) Virtual battlefield environment: man-made features include restrictive roads,
obstacles, targets, barbed wire, and anti-tank pyramids, natual features include
houses, roads, vegetation, bridges and rivers, natual climate include cloudy, sunny,
rain, snow and fog.
(2) The 3D model of weapon: we establish 3D model of armored equipment.
(3) The battlefield effect library includes driving imprinting, dust, gun muzzle
flash, surface of water, ground explosion, dynamic crater effect, equipment damage
and burning effect, infrared thermal image effect, the dynamic damage effect of the
houses, bridges and trees in natual scene.
(4) The battlefield sound effect library includes the sound of rain, the sound of
wind, the sound of explosion, the sound of fire outside the vehicle, the sound of
vehicle running and the internal sound of equipment and weapon.

2.2 Hardware Platform

According to the theory of visual perception, the visual angle of normal (1.5) eye is 2
points, the human eye is unable to identify the object which visual angle is less than 2
points.
Therefore, if the single channel scene resolution is 1920*1080, total resolution of
the three channel fusion is 5134*1080, when the maximum horizontal viewing angle
is 160 degrees, visual angle of per pixel is 160/5134*60=1.87 points, this result can
meet the need of human eye observation, under this resolution the human eye can not
feel the existence of a single pixel.
The computer hardware should meet the high resolution graphical calculation, also
should ensure the synchronous output of three channel scene. Therefore there is a
higher requirement for the computer hardware structure. In order to reduce the
number of computer, also reduce network traffic and improve the system reliability,
we use three sets of high performance HP graphics workstation as a graphic
computer, every computer is equipped with a AMD W7000 video card, and every
computer outputs three channels of high definition video signal.

2.3 Analysis and Design of Surface Texture

As shown in Figure 1, when the driver is observing the front ground through the
periscope, according to the nearest distance observed using periscope (observation
lower bound is 10 meters) and the view angle of virtual camera(100 degrees) (depress
the driver's seat) , we can calculate the width of observed ground.

W = 2 * d * tan(100/2) . (1)