LOS ANGELES – At E3 2010, 3D was all the rage. Sony and Nintendo are pushing 3D in two new directions and focusing on the mainstream consumer. The Nintendo 3DS will introduce American and European consumers to auto stereoscopic 3D (Japanese cell phones already feature this glasses-free technology) with a full slate of games. Sony’s offering a free stereoscopic 3D upgrade to its 35 million PlayStation 3s this month, turning every console into a 3D movie and gaming machine. With those giants making the jump to 3D, just about every game maker is developing titles to support this technology.