企业网站群建设的原因,合肥全网优化,广告公司名字怎么取好,wordpress英文字体样式OSG阴影 在虚拟现实仿真中#xff0c;为了真实地模拟自然效果#xff0c;阴影效果是不可缺少的#xff0c;它对一个场景的真实性是非常重要的。在游戏或仿真中#xff0c;一个高效的阴影往往能够提供非常强悍的视觉真实感。
osgShadow库 在OSG中专门定义了一个名字空间osg…OSG阴影 在虚拟现实仿真中为了真实地模拟自然效果阴影效果是不可缺少的它对一个场景的真实性是非常重要的。在游戏或仿真中一个高效的阴影往往能够提供非常强悍的视觉真实感。
osgShadow库 在OSG中专门定义了一个名字空间osgShadow来控制渲染实时阴影。实时阴影是一种相对高级的技术在每一顿场景中的几何体或灯光位置变动时要计算一个叫做shadow volume的物体shadow volume实际上是一个三维物体是投影物体的轮廓总是从光源方向投出。osgShadow库的主要组成模块可以用图11-10来表示下面分别介绍这些模块。 图11-10 osgShadow库的主要组成模块
osgShadow::ShadowedScene类: 阴影组节点它继承自osg::Group因此可以添加子节点。同时它可以指定投影对象和接受投影的对象。 void setReceivesShadowTraversalMask(unsigned int mask); unsigned int getReceivesShadowTraversalMask() const; void setCastsShadowTraversalMask(unsigned int mask); unsigned int getCastsShadowTraversalMask() const; 指定阴影实现的方法如下: void setShadowTechnique(ShadowTechnique *technique) ShadowTechnique* getShadowTechnique() const ShadowTechnique* getShadowTechnique() const osgShadow::ShadowTechnique 类:实现各种阴影的基类,它派生出3 个子类分别为ShadowMap、ShadowTexture和ShadowVolume。osgShadow::ShadowMap:实现阴影贴图(shadow map)类。osgShadow::ShadowTexture:实现阴影纹理(shadow texture)类。osgShadow::ShadowVolume:实现基于模板缓存的体积阴影(volume shadow)的阴影技法类。 阴影的实现方法有很多种现在比较流行的主要是shadow mapping 和shadow volume前者实现起来相对简单可以发挥现在GPU可编程流水线的能力但是由于先天不足shadow mapping在处理动态光源/物体时开销过大经常作为一种静态场景中的廉价替代物。而shadow volume的强项正好是shadow mapping的短处像DOOM3这种大量运用动态光源并且要对时刻都在运动中的物体投射阴影shadow volume是现阶段唯一的选择。 1 shadow mapping算法 一个物体之所以会处在阴影中是由于在它和光源之间存在着遮蔽物或者说遮蔽物离光源的距离比物体近这就是shadow mapping算法的基本原理。 [1] 以光源为视点或者说是在光源坐标系下对整个场景进行渲染目的是要得到一幅所有物体相对于光源的depth map(也就是常说的 shadow map)也就是这幅图像中每个像素的值代表着场景里面离光源最近的像素的深度值。由于这个阶段感兴趣的只是像素的深度值所以可以把所有的光照计算关掉并打开z_test和z_write 的渲染状态。 [2] 将视点恢复到原来的正常位置渲染整个场景对每个像素计算它和光源的距离然后将这个值和 depth map 中应的值比较以确定这个像素点是否处在影当中然后根据比较的结果对shadowed fragment 和 lighted fragment 分别进行不同的光照计算这样就可以得到阴影的效果了。 从上面的分析可以看出depth map 的渲染只和光源的位置及场景中物体的位置有关无论视点怎么运动只要光源和物体的相互位置关系不变shadow map 就可以被重复使用因此对于没有动态光源的场景shadow mapping 是很明智的一种选择。 2 shadow volume 算法 shadow volume 算法第一次被提出是在 1977 年 Franklin C.Crow 写的一篇论文《SHADOWALGORITHMS_FOR_COMPUTER_GRAPHICS》里其基本原理是根据光源和遮蔽物的位置关系计算出场景中会产生阴影的区域然后对所有物体进行检测以确定其会不会受阴影的影响。具体的算法可查看原论文这里就不再翻译了。 在一个场景中添加阴影的主要步骤如下: (1) 创建一个阴影场景(osgShadow::ShadowedScene)对象添加相应的子节点并标识阴影接收对象和阴影投影对象。 (2)创建一个阴影技术对象主要有 osgShadow::ShadowMap、osgShadow::ShadowTexture和osgShadow::ShadowVolume并关联到阴影场景对象。 (3)把阴影场景对象作为子节点加到场景根节点下实例渲染。 下面来看一个简单的阴影示例。
阴影示例 阴影(osgShadow)示例的代码如程序清单 11-8 示。
/********************************* 阴影 *********************************/
const int ReceivesShadowTraversalMask 0x1;// 标识阴影接收对象
const int CastsShadowTraversalMask 0x2;
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41456.6992, 1.8000 },{ 6007.7998, 41457.0000, 1.8000 },{ 6007.7998, 41457.3008, 1.8000 },{ 6007.7998, 41457.6016, 1.8000 },{ 6007.7998, 41457.8984, 1.8000 },{ 6007.7998, 41458.1992, 1.8000 },{ 6007.7998, 41458.5000, 1.8000 },{ 6007.7998, 41458.8008, 1.8700 },{ 6007.7998, 41459.1016, 1.9000 },{ 6007.7998, 41459.3984, 1.9400 },{ 6007.7998, 41459.6992, 1.9700 },{ 6007.7998, 41460.0000, 1.9900 },{ 6007.7998, 41460.3008, 2.0000 },{ 6007.7998, 41460.6016, 2.0200 },{ 6007.7998, 41460.8984, 2.0500 },{ 6007.7998, 41461.1992, 2.1000 },{ 6007.7998, 41461.5000, 2.1600 },{ 6007.7998, 41461.8008, 2.2300 },{ 6007.7998, 41462.1016, 2.3100 },{ 6007.7998, 41462.3984, 2.4100 },{ 6007.7998, 41462.6992, 2.5400 },{ 6007.7998, 41463.0000, 2.6600 },{ 6007.7998, 41463.3008, 2.7800 },{ 6007.7998, 41463.6016, 2.8900 },{ 6007.7998, 41463.8984, 2.9900 },{ 6007.7998, 41464.1992, 3.0800 },{ 6007.7998, 41464.5000, 3.1600 },{ 6007.7998, 41464.8008, 3.1800 },{ 6007.7998, 41465.1016, 3.1700 },{ 6007.7998, 41465.3984, 3.1800 },{ 6007.7998, 41465.6992, 3.2100 },{ 6007.7998, 41466.0000, 3.3000 },{ 6007.7998, 41466.3008, 3.4300 },{ 6007.7998, 41466.6016, 3.5400 },{ 6007.7998, 41466.8984, 3.6300 },{ 6007.7998, 41467.1992, 3.6400 },{ 6007.7998, 41467.5000, 3.6000 },{ 6008.1001, 41456.1016, 1.8200 },{ 6008.1001, 41456.3984, 1.7900 },{ 6008.1001, 41456.6992, 1.8000 },{ 6008.1001, 41457.0000, 1.8000 },{ 6008.1001, 41457.3008, 1.8000 },{ 6008.1001, 41457.6016, 1.8000 },{ 6008.1001, 41457.8984, 1.8000 },{ 6008.1001, 41458.1992, 1.8000 },{ 6008.1001, 41458.5000, 1.8700 },{ 6008.1001, 41458.8008, 1.9000 },{ 6008.1001, 41459.1016, 1.9300 },{ 6008.1001, 41459.3984, 1.9600 },{ 6008.1001, 41459.6992, 2.0000 },{ 6008.1001, 41460.0000, 2.0200 },{ 6008.1001, 41460.3008, 2.0400 },{ 6008.1001, 41460.6016, 2.0700 },{ 6008.1001, 41460.8984, 2.1000 },{ 6008.1001, 41461.1992, 2.1600 },{ 6008.1001, 41461.5000, 2.2300 },{ 6008.1001, 41461.8008, 2.3100 },{ 6008.1001, 41462.1016, 2.3900 },{ 6008.1001, 41462.3984, 2.5000 },{ 6008.1001, 41462.6992, 2.6300 },{ 6008.1001, 41463.0000, 2.7500 },{ 6008.1001, 41463.3008, 2.8700 },{ 6008.1001, 41463.6016, 2.9800 },{ 6008.1001, 41463.8984, 3.0800 },{ 6008.1001, 41464.1992, 3.1600 },{ 6008.1001, 41464.5000, 3.2300 },{ 6008.1001, 41464.8008, 3.2600 },{ 6008.1001, 41465.1016, 3.2500 },{ 6008.1001, 41465.3984, 3.2600 },{ 6008.1001, 41465.6992, 3.2900 },{ 6008.1001, 41466.0000, 3.3800 },{ 6008.1001, 41466.3008, 3.4900 },{ 6008.1001, 41466.6016, 3.5900 },{ 6008.1001, 41466.8984, 3.6700 },{ 6008.1001, 41467.1992, 3.6700 },{ 6008.1001, 41467.5000, 3.6400 },{ 6008.3999, 41456.1016, 1.8100 },{ 6008.3999, 41456.3984, 1.8000 },{ 6008.3999, 41456.6992, 1.8000 },{ 6008.3999, 41457.0000, 1.8000 },{ 6008.3999, 41457.3008, 1.8000 },{ 6008.3999, 41457.6016, 1.8000 },{ 6008.3999, 41457.8984, 1.8000 },{ 6008.3999, 41458.1992, 1.8000 },{ 6008.3999, 41458.5000, 1.9100 },{ 6008.3999, 41458.8008, 1.9400 },{ 6008.3999, 41459.1016, 1.9600 },{ 6008.3999, 41459.3984, 1.9900 },{ 6008.3999, 41459.6992, 2.0200 },{ 6008.3999, 41460.0000, 2.0500 },{ 6008.3999, 41460.3008, 2.0800 },{ 6008.3999, 41460.6016, 2.1200 },{ 6008.3999, 41460.8984, 2.1600 },{ 6008.3999, 41461.1992, 2.2200 },{ 6008.3999, 41461.5000, 2.2900 },{ 6008.3999, 41461.8008, 2.3600 },{ 6008.3999, 41462.1016, 2.4400 },{ 6008.3999, 41462.3984, 2.5600 },{ 6008.3999, 41462.6992, 2.6900 },{ 6008.3999, 41463.0000, 2.8100 },{ 6008.3999, 41463.3008, 2.9400 },{ 6008.3999, 41463.6016, 3.0600 },{ 6008.3999, 41463.8984, 3.1700 },{ 6008.3999, 41464.1992, 3.2700 },{ 6008.3999, 41464.5000, 3.3500 },{ 6008.3999, 41464.8008, 3.3700 },{ 6008.3999, 41465.1016, 3.3600 },{ 6008.3999, 41465.3984, 3.3600 },{ 6008.3999, 41465.6992, 3.3800 },{ 6008.3999, 41466.0000, 3.4500 },{ 6008.3999, 41466.3008, 3.5500 },{ 6008.3999, 41466.6016, 3.6400 },{ 6008.3999, 41466.8984, 3.7100 },{ 6008.3999, 41467.1992, 3.7100 },{ 6008.3999, 41467.5000, 3.6900 },{ 6008.7002, 41456.1016, 1.7800 },{ 6008.7002, 41456.3984, 1.7800 },{ 6008.7002, 41456.6992, 1.8000 },{ 6008.7002, 41457.0000, 1.8000 },{ 6008.7002, 41457.3008, 1.8000 },{ 6008.7002, 41457.6016, 1.8000 },{ 6008.7002, 41457.8984, 1.8000 },{ 6008.7002, 41458.1992, 1.9000 },{ 6008.7002, 41458.5000, 1.9400 },{ 6008.7002, 41458.8008, 1.9800 },{ 6008.7002, 41459.1016, 2.0100 },{ 6008.7002, 41459.3984, 2.0400 },{ 6008.7002, 41459.6992, 2.0800 },{ 6008.7002, 41460.0000, 2.1100 },{ 6008.7002, 41460.3008, 2.1500 },{ 6008.7002, 41460.6016, 2.1800 },{ 6008.7002, 41460.8984, 2.2300 },{ 6008.7002, 41461.1992, 2.2800 },{ 6008.7002, 41461.5000, 2.3300 },{ 6008.7002, 41461.8008, 2.3800 },{ 6008.7002, 41462.1016, 2.4600 },{ 6008.7002, 41462.3984, 2.5700 },{ 6008.7002, 41462.6992, 2.7000 },{ 6008.7002, 41463.0000, 2.8300 },{ 6008.7002, 41463.3008, 2.9700 },{ 6008.7002, 41463.6016, 3.1000 },{ 6008.7002, 41463.8984, 3.2300 },{ 6008.7002, 41464.1992, 3.3600 },{ 6008.7002, 41464.5000, 3.4500 },{ 6008.7002, 41464.8008, 3.4800 },{ 6008.7002, 41465.1016, 3.4600 },{ 6008.7002, 41465.3984, 3.4600 },{ 6008.7002, 41465.6992, 3.4700 },{ 6008.7002, 41466.0000, 3.5300 },{ 6008.7002, 41466.3008, 3.6200 },{ 6008.7002, 41466.6016, 3.7000 },{ 6008.7002, 41466.8984, 3.7600 },{ 6008.7002, 41467.1992, 3.7700 },{ 6008.7002, 41467.5000, 3.7500 },{ 6009.0000, 41456.1016, 1.7300 },{ 6009.0000, 41456.3984, 1.7500 },{ 6009.0000, 41456.6992, 1.7500 },{ 6009.0000, 41457.0000, 1.8000 },{ 6009.0000, 41457.3008, 1.8000 },{ 6009.0000, 41457.6016, 1.8000 },{ 6009.0000, 41457.8984, 1.8600 },{ 6009.0000, 41458.1992, 1.9000 },{ 6009.0000, 41458.5000, 1.9500 },{ 6009.0000, 41458.8008, 2.0000 },{ 6009.0000, 41459.1016, 2.0600 },{ 6009.0000, 41459.3984, 2.1100 },{ 6009.0000, 41459.6992, 2.1700 },{ 6009.0000, 41460.0000, 2.2100 },{ 6009.0000, 41460.3008, 2.2400 },{ 6009.0000, 41460.6016, 2.2800 },{ 6009.0000, 41460.8984, 2.3200 },{ 6009.0000, 41461.1992, 2.3400 },{ 6009.0000, 41461.5000, 2.3700 },{ 6009.0000, 41461.8008, 2.4000 },{ 6009.0000, 41462.1016, 2.4500 },{ 6009.0000, 41462.3984, 2.5500 },{ 6009.0000, 41462.6992, 2.6800 },{ 6009.0000, 41463.0000, 2.8100 },{ 6009.0000, 41463.3008, 2.9400 },{ 6009.0000, 41463.6016, 3.0900 },{ 6009.0000, 41463.8984, 3.2300 },{ 6009.0000, 41464.1992, 3.3700 },{ 6009.0000, 41464.5000, 3.4900 },{ 6009.0000, 41464.8008, 3.5200 },{ 6009.0000, 41465.1016, 3.5200 },{ 6009.0000, 41465.3984, 3.5200 },{ 6009.0000, 41465.6992, 3.5400 },{ 6009.0000, 41466.0000, 3.6000 },{ 6009.0000, 41466.3008, 3.6900 },{ 6009.0000, 41466.6016, 3.7600 },{ 6009.0000, 41466.8984, 3.8300 },{ 6009.0000, 41467.1992, 3.8400 },{ 6009.0000, 41467.5000, 3.8300 },{ 6009.2998, 41456.1016, 1.7000 },{ 6009.2998, 41456.3984, 1.7100 },{ 6009.2998, 41456.6992, 1.7200 },{ 6009.2998, 41457.0000, 1.7400 },{ 6009.2998, 41457.3008, 1.7600 },{ 6009.2998, 41457.6016, 1.7900 },{ 6009.2998, 41457.8984, 1.8400 },{ 6009.2998, 41458.1992, 1.8900 },{ 6009.2998, 41458.5000, 1.9400 },{ 6009.2998, 41458.8008, 2.0000 },{ 6009.2998, 41459.1016, 2.0800 },{ 6009.2998, 41459.3984, 2.1500 },{ 6009.2998, 41459.6992, 2.2300 },{ 6009.2998, 41460.0000, 2.2800 },{ 6009.2998, 41460.3008, 2.3300 },{ 6009.2998, 41460.6016, 2.3800 },{ 6009.2998, 41460.8984, 2.4200 },{ 6009.2998, 41461.1992, 2.4300 },{ 6009.2998, 41461.5000, 2.4300 },{ 6009.2998, 41461.8008, 2.4300 },{ 6009.2998, 41462.1016, 2.4500 },{ 6009.2998, 41462.3984, 2.5400 },{ 6009.2998, 41462.6992, 2.6500 },{ 6009.2998, 41463.0000, 2.7700 },{ 6009.2998, 41463.3008, 2.8900 },{ 6009.2998, 41463.6016, 3.0300 },{ 6009.2998, 41463.8984, 3.1800 },{ 6009.2998, 41464.1992, 3.3200 },{ 6009.2998, 41464.5000, 3.4500 },{ 6009.2998, 41464.8008, 3.5000 },{ 6009.2998, 41465.1016, 3.5200 },{ 6009.2998, 41465.3984, 3.5400 },{ 6009.2998, 41465.6992, 3.5800 },{ 6009.2998, 41466.0000, 3.6500 },{ 6009.2998, 41466.3008, 3.7500 },{ 6009.2998, 41466.6016, 3.8400 },{ 6009.2998, 41466.8984, 3.9100 },{ 6009.2998, 41467.1992, 3.9400 },{ 6009.2998, 41467.5000, 3.9300 },{ 6009.6001, 41456.3984, 1.6900 },{ 6009.6001, 41456.6992, 1.7000 },{ 6009.6001, 41457.0000, 1.7100 },{ 6009.6001, 41457.3008, 1.7300 },{ 6009.6001, 41457.6016, 1.7600 },{ 6009.6001, 41457.8984, 1.8000 },{ 6009.6001, 41458.1992, 1.8500 },{ 6009.6001, 41458.5000, 1.9000 },{ 6009.6001, 41458.8008, 1.9700 },{ 6009.6001, 41459.1016, 2.0500 },{ 6009.6001, 41459.3984, 2.1400 },{ 6009.6001, 41459.6992, 2.2200 },{ 6009.6001, 41460.0000, 2.3100 },{ 6009.6001, 41460.3008, 2.3800 },{ 6009.6001, 41460.6016, 2.4600 },{ 6009.6001, 41460.8984, 2.5200 },{ 6009.6001, 41461.1992, 2.5400 },{ 6009.6001, 41461.5000, 2.5200 },{ 6009.6001, 41461.8008, 2.5200 },{ 6009.6001, 41462.1016, 2.5300 },{ 6009.6001, 41462.3984, 2.5900 },{ 6009.6001, 41462.6992, 2.6900 },{ 6009.6001, 41463.0000, 2.7900 },{ 6009.6001, 41463.3008, 2.8900 },{ 6009.6001, 41463.6016, 3.0100 },{ 6009.6001, 41463.8984, 3.1400 },{ 6009.6001, 41464.1992, 3.2600 },{ 6009.6001, 41464.5000, 3.3700 },{ 6009.6001, 41464.8008, 3.4400 },{ 6009.6001, 41465.1016, 3.4900 },{ 6009.6001, 41465.3984, 3.5500 },{ 6009.6001, 41465.6992, 3.6100 },{ 6009.6001, 41466.0000, 3.7000 },{ 6009.6001, 41466.3008, 3.8100 },{ 6009.6001, 41466.6016, 3.9200 },{ 6009.6001, 41466.8984, 4.0000 },{ 6009.6001, 41467.1992, 4.0400 },{ 6009.6001, 41467.5000, 4.0400 },{ 6009.6001, 41467.8008, 4.0500 },{ 6009.8999, 41456.3984, 1.6900 },{ 6009.8999, 41456.6992, 1.7000 },{ 6009.8999, 41457.0000, 1.7100 },{ 6009.8999, 41457.3008, 1.7200 },{ 6009.8999, 41457.6016, 1.7400 },{ 6009.8999, 41457.8984, 1.7600 },{ 6009.8999, 41458.1992, 1.7900 },{ 6009.8999, 41458.5000, 1.8200 },{ 6009.8999, 41458.8008, 1.9000 },{ 6009.8999, 41459.1016, 2.0000 },{ 6009.8999, 41459.3984, 2.1000 },{ 6009.8999, 41459.6992, 2.2000 },{ 6009.8999, 41460.0000, 2.3100 },{ 6009.8999, 41460.3008, 2.4200 },{ 6009.8999, 41460.6016, 2.5200 },{ 6009.8999, 41460.8984, 2.6200 },{ 6009.8999, 41461.1992, 2.6500 },{ 6009.8999, 41461.5000, 2.6600 },{ 6009.8999, 41461.8008, 2.6700 },{ 6009.8999, 41462.1016, 2.6900 },{ 6009.8999, 41462.3984, 2.7400 },{ 6009.8999, 41462.6992, 2.8200 },{ 6009.8999, 41463.0000, 2.9000 },{ 6009.8999, 41463.3008, 2.9900 },{ 6009.8999, 41463.6016, 3.0700 },{ 6009.8999, 41463.8984, 3.1600 },{ 6009.8999, 41464.1992, 3.2400 },{ 6009.8999, 41464.5000, 3.3100 },{ 6009.8999, 41464.8008, 3.4000 },{ 6009.8999, 41465.1016, 3.4800 },{ 6009.8999, 41465.3984, 3.5700 },{ 6009.8999, 41465.6992, 3.6600 },{ 6009.8999, 41466.0000, 3.7700 },{ 6009.8999, 41466.3008, 3.8800 },{ 6009.8999, 41466.6016, 3.9900 },{ 6009.8999, 41466.8984, 4.0900 },{ 6009.8999, 41467.1992, 4.1300 },{ 6009.8999, 41467.5000, 4.1400 },{ 6009.8999, 41467.8008, 4.1600 },};void shadower_11_8(const string strDataFolder)
{osg::ref_ptrosgViewer::Viewer viewer new osgViewer::Viewer();osg::ref_ptrosg::GraphicsContext::Traits traits new osg::GraphicsContext::Traits;traits-x 40;traits-y 40;traits-width 600;traits-height 480;traits-windowDecoration true;traits-doubleBuffer true;traits-sharedContext 0;osg::ref_ptrosg::GraphicsContext gc osg::GraphicsContext::createGraphicsContext(traits.get());osg::ref_ptrosg::Camera camera viewer-getCamera();camera-setGraphicsContext(gc.get());camera-setViewport(new osg::Viewport(0, 0, traits-width, traits-height));GLenum buffer traits-doubleBuffer ? GL_BACK : GL_FRONT;camera-setDrawBuffer(buffer);camera-setReadBuffer(buffer);osg::ref_ptrosg::Group root new osg::Group();// 创建一个阴影节点并标识接收对象和投影对象osg::ref_ptrosgShadow::ShadowedScene shadowedScene new osgShadow::ShadowedScene();shadowedScene-setReceivesShadowTraversalMask(ReceivesShadowTraversalMask);shadowedScene-setCastsShadowTraversalMask(CastsShadowTraversalMask);// 创建阴影纹理osg::ref_ptrosgShadow::ShadowTexture st new osgShadow::ShadowTexture();// 关联阴影纹理shadowedScene-setShadowTechnique(st);osg::ref_ptrosg::Node node new osg::Node();node createModel(strDataFolder);// 添加场景数据并添加光源shadowedScene-addChild(createLight(node.get()));shadowedScene-addChild(node.get());root-addChild(shadowedScene.get());// 优化场景数据osgUtil::Optimizer optimize;optimize.optimize(root.get());viewer-setSceneData(root.get());viewer-realize();viewer-run();
}// 创建动画路径
osg::ref_ptrosg::AnimationPath createAnimationPath(osg::Vec3 center,float radius, double looptime)
{osg::ref_ptrosg::AnimationPath animationPath new osg::AnimationPath;animationPath-setLoopMode(osg::AnimationPath::LOOP);int numSamples 40;float yaw 0.0;float yaw_delta 2.0 * osg::PI / (numSamples - 1.0);float roll osg::inDegrees(30.0);double time 0.0;double time_delta looptime / (double)numSamples;for (int i 0; i numSamples; i){osg::Vec3 position(center osg::Vec3(sinf(yaw) * radius, cosf(yaw) * radius, 0.0));osg::Quat rotation(osg::Quat(roll, osg::Vec3(0.0, 1.0, 0.0))*osg::Quat(-(yaw osg::inDegrees(90.0)), osg::Vec3(0.0, 0.0, 1.0)));animationPath-insert(time, osg::AnimationPath::ControlPoint(position, rotation));yaw yaw_delta;time time_delta;}return animationPath.get();
}// 创建地形平面
osg::ref_ptrosg::Node createBase(const string strDataFolder, const osg::Vec3 center, float radius)
{osg::ref_ptrosg::Geode geode new osg::Geode;// 设置纹理属性osg::ref_ptrosg::StateSet stateset new osg::StateSet();string strDataPath strDataFolder Images\\lz.rgb;osg::ref_ptrosg::Image image osgDB::readImageFile(strDataPath);if (image.get()){osg::ref_ptrosg::Texture2D texture new osg::Texture2D;texture-setImage(image.get());stateset-setTextureAttributeAndModes(0, texture.get(), osg::StateAttribute::ON);}geode-setStateSet(stateset.get());// 申请一个高程类osg::ref_ptrosg::HeightField grid new osg::HeightField;grid-allocate(38, 39);grid-setOrigin(center osg::Vec3(-radius, -radius, 0.0));grid-setXInterval(radius * 2.0 / (38 - 1.0));grid-setYInterval(radius * 2.0 / (39 - 1.0));// 得到最高值和最低值以确定合适的高程素芳和高程偏移float minHeight FLT_MAX;float maxHeight -FLT_MAX;for (unsigned int r 0; r 39; r){for (unsigned int c 0; c 38; c){float h vertex[r c * 39][2];if (h maxHeight){maxHeight h;}if (h minHeight){minHeight h;}}}float heightScale radius * 0.5 / (maxHeight - minHeight);float heightOffset -(minHeight maxHeight) * 0.5;// 设置行列数据for (unsigned int r 0; r 39; r){for (unsigned int c 0; c 38; c){float h vertex[r c * 39][2];grid-setHeight(c, r, (h heightOffset) * heightScale);}}geode-addDrawable(new osg::ShapeDrawable(grid.get()));osg::ref_ptrosg::Group group new osg::Group;group-addChild(geode.get());return group.get();
}// 创建飞机动画模型
osg::ref_ptrosg::Node createMovingModel(const string strDataFolder, osg::Vec3 center, float radius)
{float animationLength 10.0;osg::ref_ptrosg::AnimationPath animationPath createAnimationPath(center, radius,animationLength);osg::ref_ptrosg::Group model new osg::Group;string strDataPath strDataFolder cessna.osg;osg::ref_ptrosg::Node cessna osgDB::readNodeFile(strDataPath);if (cessna.get()){const osg::BoundingSphere bs cessna-getBound();float size radius / bs.radius() * 0.3;osg::ref_ptr osg::MatrixTransform positioned new osg::MatrixTransform;positioned-setDataVariance(osg::Object::STATIC);positioned-setMatrix(osg::Matrix::translate(-bs.center())*osg::Matrix::scale(size, size, size)*osg::Matrix::rotate(osg::inDegrees(180.0f), 0.0f, 0.0f, 2.0f));positioned-addChild(cessna.get());osg::ref_ptrosg::MatrixTransform xform new osg::MatrixTransform;xform-setUpdateCallback(new osg::AnimationPathCallback(animationPath, 0.0, 2.0));xform-addChild(positioned);model-addChild(xform.get());}return model.get();
}// 创建场景数据
osg::ref_ptrosg::Node createModel(const string strDataFolder)
{osg::Vec3 center(0, 0, 0);float radius 100.0;osg::Vec3 lightPosition(center osg::Vec3(0, 0, radius));osg::ref_ptrosg::Node shadower createMovingModel(strDataFolder, center, radius * 0.5);shadower-setNodeMask(CastsShadowTraversalMask);osg::ref_ptrosg::Node shadowed createBase(strDataFolder, center - osg::Vec3(0, 0, radius*0.25), radius);shadowed-setNodeMask(CastsShadowTraversalMask);osg::ref_ptrosg::Group group new osg::Group;group-addChild(shadowed.get());group-addChild(shadower.get());return group.get();
}// 创建一个光照
osg::ref_ptrosg::Node createLight(osg::ref_ptrosg::Node model)
{osg::ComputeBoundsVisitor cbbv;model-accept(cbbv);osg::BoundingBox bb cbbv.getBoundingBox();osg::Vec4 lightpos;lightpos.set(bb.center().x(), bb.center().y(), bb.zMax() bb.radius() * 2.0, 1.0);osg::ref_ptrosg::LightSource ls new osg::LightSource();ls-getLight()-setPosition(lightpos);ls-getLight()-setAmbient(osg::Vec4(0.2, 0.2, 0.2, 1.0));ls-getLight()-setDiffuse(osg::Vec4(0.8, 0.8, 0.8, 1.0));return ls.get();
} 运行程序截图如图 11-11 所示 图11-11阴影示例裁图
