osgUtil.SharedArrayOptimizer

osgUtil.SharedArrayOptimizer 类是 OpenSceneGraph 中的一个优化器，用于共享顶点和索引数据的数组，从而减少内存使用量，提高渲染效率。

使用方法

#include <osg/Node>
#include <osg/Geometry>
#include <osgUtil/SharedArrayOptimizer>

osg::Node* node = ...
osgUtil::SharedArrayOptimizer optimizer;
optimizer.optimize(node);

首先，需要包含 OpenSceneGraph 中的 osg/Node 和 osg/Geometry 头文件。然后创建一个 osg::Node 对象，并实例化 osgUtil::SharedArrayOptimizer 类。调用 optimize() 方法对节点数据进行优化处理。

例子

#include <osg/Geode>
#include <osg/Geometry>
#include <osgUtil/SharedArrayOptimizer>
#include <osgViewer/Viewer>

int main()
{
    // 创建一个几何体对象
    osg::ref_ptr<osg::Geode> geode = new osg::Geode();
    osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
    geode->addDrawable(geom);

    // 添加顶点、法线和颜色数据
    osg::Vec3Array* vertices = new osg::Vec3Array();
    vertices->push_back(osg::Vec3(-1.0f, -1.0f, 0.0f));
    vertices->push_back(osg::Vec3( 1.0f, -1.0f, 0.0f));
    vertices->push_back(osg::Vec3( 0.0f,  1.0f, 0.0f));
    geom->setVertexArray(vertices);

    osg::Vec3Array* normals = new osg::Vec3Array();
    normals->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
    geom->setNormalArray(normals, osg::Array::BIND_OVERALL);

    osg::Vec4Array* colors = new osg::Vec4Array();
    colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f));
    geom->setColorArray(colors, osg::Array::BIND_OVERALL);

    // 添加绘制指令
    osg::DrawElementsUInt* indices = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES);
    indices->push_back(0);
    indices->push_back(1);
    indices->push_back(2);
    geom->addPrimitiveSet(indices);

    // 使用 SharedArrayOptimizer 进行共享数组优化
    osgUtil::SharedArrayOptimizer optimizer;
    optimizer.optimize(geode);

    // 创建 Viewer 并运行程序
    osgViewer::Viewer viewer;
    viewer.setSceneData(geode);
    return viewer.run();
}

参考文献

• OpenSceneGraph: osgUtil.SharedArrayOptimizer