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The Advantages and Disadvantages of Skybox Techniques  

2013-12-17 14:37:49|  分类: android |  标签: |举报 |字号 订阅

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While a cube map by itself works great for a simple skybox, there are a few disadvantages that come with the simplicity. The effect only works well if the skybox is rendered
from the center of the cube, so anything that’s part of the skybox will always appear
to  be  at  the  same  distance  from  viewers,  no  matter  how  far  they  travel.  Since  the
skybox  is  usually  composed  of  prerendered  textures,  the  scene  is  also  necessarily
static, with clouds that don’t move. And depending on the viewer’s field of vision, the
cube map textures might need to be very high resolution to look good on the screen,
eating up a lot of texture memory and bandwidth.
Many  modern  games  and  applications  usually  work  around  these  limitations  by
complementing the traditional skybox technique with a separate 3D scene with its
own  dynamic  elements  and  clouds.  This  separate  3D  scene  will  still  be  rendered
behind  everything  else;  but  the  camera  can  also  move  around  this  separate  scene
and  elements  inside  that  scene  can  be  animated,  giving  the  viewer  the  illusion  of
being in a gigantic 3D world.
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