3D has become almost a dirty word in the current moviegoing environment, but itâs a useful tool when done with purpose and precision (see: Hugo). One of the genres in which 3D really shines is animation, and with Disneyâs announcement that theyâll be releasing a number of classics back into theaters weâll get the chance to see some excellent 3D put to good use. First up on Disney-Pixarâs theatrical re-release slate is Finding Nemo, and a full trailer for the 3D release is now online. The trailer plays up the 3D aspect, and Iâm assuming itâs more effective when seen in three dimensions. While 3D seems like a perfect fit for Pixarâs gorgeous ocean-set pic, Iâm also just eager to see Andrew Stantonâs incredibly sweet, funny, and heartfelt film on the big screen once again.Hit the jump to watch the trailer for Finding Nemo 3D, and brace for the 3D re-releases of Monsterâs Inc. and The Little Mermaid which will follow. Finding Nemo returns to theaters on September 14th.Click over to Yahoo! to watch in HD.