材質圖檔：PT_003.GIF 材質內容：塑膠材質
說明：這裡放了三原色(紅、藍、綠)的塑
膠材質，在surface裡設定diffuse為
1 0 0即為全紅，0 1 0即為全綠，
0 0 1即為全藍，再加上shine值使
之看起來略為反光，很平滑的感覺
。
//==========================================================
// A image of plastic --- pt_003.b.
// neutral base
surf { diff white }
ring { center 0 0 0 normal 0 0 1 radius 100 }
// blue plastic surface
// pattern sample
surf { diff red shine 200 white }
#include cone.bo
surf { diff green shine 200 white }
#include block.bo
surf { diff blue shine 200 white }
#include pole.bo
//========================================================