透明度设置 在线等

water_GIS

我使用jpeg图片对矩形进行贴图的，我想设置图片为半透明，能后看到它后面的图片，在osg里该咋设置啊，用这个代码没效果啊
osg::BlendColor *bc=new osg::BlendColor(osg::Vec4(1.0,0,0,0));
osg::BlendFunc * bf=new osg::BlendFunc();
bf->setSourceAlpha(osg::BlendFunc::CONSTANT_ALPHA);
bf->setDestinationAlpha(osg::BlendFunc::ONE_MINUS_CONSTANT_ALPHA);
stateset->setAttributeAndModes(bf,osg::StateAttribute::ON);
stateset->setAttributeAndModes(bc,osg::StateAttribute::ON);
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
新手上路，各位大虾多多指教

朽木

material有个settransparency的函数～

water_GIS

回复 2# 朽木


   谢谢，问题解决了，用的BlendFun函数.
  osg::StateSet* stateset = geom->getOrCreateStateSet();
  stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF |
   osg::StateAttribute::PROTECTED);
  //打开融合模式(以保证ALPHA纹理正确)
  stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
  //禁止深度测试,几何体忽略已绘制物体的深度值
  stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
  stateset->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );

osg::BlendColor *bc=new osg::BlendColor(osg::Vec4(1.0,0,0,0));
osg::BlendFunc * bf=new osg::BlendFunc();
stateset->setAttributeAndModes(bf,osg::StateAttribute::ON);
stateset->setAttributeAndModes(bc,osg::StateAttribute::ON);
  bf->setSource(osg::BlendFunc::CONSTANT_ALPHA);
     bf->setDestination(osg::BlendFunc::ONE_MINUS_CONSTANT_ALPHA);
  bc->setConstantColor(osg::Vec4(1, 1, 1,0.4f));