OSG 让模型变成你想要的颜色 （贴纹理）

#include <QCoreApplication>

#include <osgDB/ReadFile>

#include <osgViewer/Viewer>

#include <osg/Texture2D>

#include <osg/TexEnv>

#include <osg/TexGen>

osg::Image* createImage( int width, int height,osg::Vec3 color )

{

    osg::ref_ptr<osg::Image> image = new osg::Image;

    image->allocateImage( width, height, 1, GL_RGB, GL_UNSIGNED_BYTE );

    unsigned char* data = image->data();

    for ( int y=0; y<height; ++y )

    {

        for ( int x=0; x<width; ++x )

        {

            *(data++) = color.x();

            *(data++) = color.y();

            *(data++) = color.z();

        }

    }

    return image.release();

}

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    osgViewer::Viewer viewer;

    osg::ref_ptr<osg::Node> model = osgDB::readNodeFile("cow.osg");

    if(model.valid())

    {

        osg::ref_ptr<osg::Image> image= createImage(256,256,osg::Vec3(255.0,1.0,0.0));

        if (image.get())

        {

            osg::ref_ptr<osg::Texture2D> texture=new osg::Texture2D();

            texture->setImage(image.get());

            //设置自动生成纹理坐标

            osg::ref_ptr<osg::TexGen> texgen=new osg::TexGen();

            texgen->setMode(osg::TexGen::NORMAL_MAP);

            //设置纹理环境，模式为BLEND

            osg::ref_ptr<osg::TexEnv> texenv=new osg::TexEnv;

            texenv->setMode(osg::TexEnv::Mode::ADD);

            texenv->setColor(osg::Vec4(0.6,0.6,0.6,0.0));

            //启动单元一自动生成纹理坐标，并使用纹理

            osg::ref_ptr<osg::StateSet> state=new osg::StateSet;

            state->setTextureAttributeAndModes(1,texture.get(),osg::StateAttribute::ON);

            state->setTextureAttributeAndModes(1,texgen.get(),osg::StateAttribute::ON);

           // state->setTextureAttribute(1,texenv.get());

            model->setStateSet(state.get());

        }

        viewer.setSceneData(model.get());

    }

    viewer.run();

    return a.exec();

}