Re: Xbox 360 Graphics rendering issue

The Sims 3 PC support - goodish

The Sims 3 MAC support - bad

The Sims 3 XBOX 360 support - non-existent

I think you'll have better luck in an XBOX 360 forum. I have one, but don't have The Sims 3 on it, neither have I had any issues with rendering in any game ever. Some XBOX 360 players say that installing the game to the drive solves it, but if you've already tried that then I guess you'll have better luck getting a solution in that forum.