Method drawQuakeLabelsOnSphere

samples/Earthquake/src/Earth.cpp:108–153

}

void Earth::drawQuakeLabelsOnSphere( const vec3 &eyeNormal, const float eyeDist )
{
	gl::ScopedDepthTest depthTest( true );
	gl::ScopedDepthWrite depthWrite( false );
	gl::ScopedGlslProg shader( gl::getStockShader( gl::ShaderDef().color().texture() ) );

	gl::ScopedColor color( 1, 1, 1 );
	gl::ScopedBlendAlpha blend;

	const float distMulti = eyeDist * 0.001f;
	for( auto &quake : mQuakes ) {
		// Skip if minor earthquake.
		if( quake.mMag < mMinMagToRender )
			continue;

		// Skip if invisible.
		float dp = glm::dot( glm::normalize( quake.mLoc ), glm::normalize( eyeNormal ) ) - 0.85f;
		if( dp <= 0.0f )
			continue;

		// Calculate billboard vectors.
		vec3 dir = glm::normalize( mLoc - quake.mLoc );
		vec3 perp1 = glm::cross( dir, vec3( 0, 1, 0 ) );
		vec3 perp2 = glm::cross( perp1, dir ); perp1 = glm::cross( perp2, dir );

		float x = quake.mLocTip.x;
		float y = quake.mLocTip.y;
		float z = quake.mLocTip.z;

		float w = quake.mLabel->getWidth() * dp * distMulti;
		float h = quake.mLabel->getHeight() * dp * distMulti;

		// Render billboard.
		gl::ScopedTextureBind tex0( quake.mLabel, 0 );
		gl::begin( GL_TRIANGLE_STRIP );
		gl::texCoord( 0, 0 );
		gl::vertex( x + perp1.x * w - perp2.x * h, y + perp1.y * w - perp2.y * h, z + perp1.z * w - perp2.z * h );
		gl::texCoord( 1, 0 );
		gl::vertex( x - perp1.x * w - perp2.x * h, y - perp1.y * w - perp2.y * h, z - perp1.z * w - perp2.z * h );
		gl::texCoord( 0, 1 );
		gl::vertex( x + perp1.x * w + perp2.x * h, y + perp1.y * w + perp2.y * h, z + perp1.z * w + perp2.z * h );
		gl::texCoord( 1, 1 );
		gl::vertex( x - perp1.x * w + perp2.x * h, y - perp1.y * w + perp2.y * h, z - perp1.z * w + perp2.z * h );
		gl::end();
	}
}

void Earth::addQuake( float aLat, float aLong, float aMag, const std::string &aTitle )
{