虚拟校园VRML语言解题.ppt

三维虚拟校园浏览系统 软件1102班 目录 二、整体效果 沈阳工业大学 一、关键节点应用 TimeSensor时间传感器节点 和 PositionInterpolator位置插补器节点 IndexedLineSet线集节点 IndexedFaceSet节点 Billboard布告牌节点 Inline内联节点 TimeSensor时间传感器节点 和 PositionInterpolator位置插补器节点 （1）TimeSensor用于创建一个系统虚拟时钟，可以在一个指定的时间引发动作或固定时间间隔输出事件（2） DEF clock?TimeSensor?{ cycleInterval?20 //时间周期loop?TRUE?} //loop是否输出事件DEF qwz?PositionInterpolator?{ key [0.0??0.4?0.6??1.0]keyValue?[??7?1.5?0-1?1.5?0-1?1.5?07?1.5?0]}ROUTE?clock.fraction_changed TO?qwz.set_fractionROUTE?qwz.value_changed?TO?ball.translation 运行效果 IndexedLineSet线集节点 geometry IndexedLineSet{ coord Coordinate { point [ 2 0 0 - 2 0 0 -2 0.2 0 2 0.2 0 2 -0.2 0 -2 -0.2 0 ] coordIndex [ 0,1,-1 2,3,-1 4,5,-1 6,7,-1 8,9,-1 10,11,-1 ] //两点一线 IndexedFaceSet节点 Transform { translation -0.0483 0.00895 3.6e-005 rotation 0 0 1 3.15 children [Shape { geometry IndexedFaceSet { Coordinate { point [ -2.73e-011 3.72 1.04, -5.43e-011 3.73 0.839, 0.593 3.69 1.04, -0.593 3.69 1.04, ······················ 1.19 3.47 1.03, -1.29 3.18 0.849, ] } coordIndex [ 15, 16, 12, 10, -1, 6, 9, 5, 3, -1, 3, 5, ~~~~~~~~~~~ 8, -1, 11, 8, 13, -1, ] } //三点一个面 Billboard布告牌节点 DEF a Transform {translation 0 5 -50 children [ Billboard { children [ Shape {appearance Appearance {texture ImageTexture {url 6.gif}} geometry Box {size 10 15 0.0003}}]} ] } Transform {translation -14 0 -0 children [USE a ]} Transform {translation 0 0 10 children [USE a ]} Inline内联节点 DEF a Transform { translation 0 0 0 rotation 0 0 0 1. scale 1.0 1.0 1.0 children Inline {url langan1.wrl}} Transform {translation 0.5 0 0 children [USE a ]} Transform {translation 1.0 0 0 children [USE a ]} Transform {translation 1.5 0 0 children [USE a