_precipitationEffect->setFarTransition(100.0f - 60.0f*sqrtf(_snow_intensity));
_precipitationEffect->setParticleColor(osg::Vec4(0.85, 0.85, 0.85, 1.0) - osg::Vec4(0.1, 0.1, 0.1, 1.0) * _snow_intensity);
_precipitationEffect->setFarTransition(100.0f - 60.0f*sqrtf(_snow_intensity));
_precipitationEffect->setParticleColor(osg::Vec4(0.85, 0.85, 0.85, 1.0) - osg::Vec4(0.1, 0.1, 0.1, 1.0) * _snow_intensity);