Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Does the projector display 3D at 120hz? What resolution was your input file? What did you use to play it?
Document: As such, I didn't get to test this projector in 3D.Of note: Upon returning the HD33, I excitedly bought the Epson 3010 hoping it would be the answer to my 3D quest. Alas, the input lag (~1/10th second delay between picture reception and picture display) made that projector unsuitable for my use as well. Like Wylie Coyote- back to the drawing board.
When I first got the hd33 all set up i tried to play MW3 on PS3. I was kinda bummed that I was having "input lag" made it almost impossible to play online. After a few days I found a solution while messing with the settings. If you are experiencing so called "input lag" go into the advanced setup for the PURE ENGINE and turn off the Pure motion setting, you do lose a little bit of graphic quality but it still looks great! But better yet I am back playing good!
I tried both my playstation and my panasonic 3-d player but did the same thing. I tried using the other HDMI port but it wouldn't even play at all some times it would get so scrabled that it wouldn't even play. Optoma tech said to RMA it but I read that they give you a refurbished one if they can't fix it. I decided to use Amazons return policy and they sent me a new one within the hour and the next day UPS took the old one from my door step. I was pretty impressed by that.
i used to have native 720p projector  but i need hd33 for native 1080p resolution. i watch lot of blu ray movies and 3d gaming. ohh man the quality is good as my 2011 top of the line panasonic tv which i use it on my main floor. i used to worry about rainbow artifact but trust me YOU SHOULD NOT WORRY ABOUT IT! if you can not see in theater you won't see on home projector either and this hd33 has 6 times color wheel compare to other home project which has 4 color wheel.
Ohh and the 3D is amazing! movie theater quality at least.I would recommend this projector to anyone that is looking to buy, definitely the best way to play PS3 and watch movies!
I read several reviews before committing to purchase the product, and what really won me over were the positive comments on the 3D feature. I must say the positive reviews were right on target. The 3D effects on this projector are awesome! I now get to see The Avengers in a whole new light, and look forward to Avatar and Transformers next. I did have a little problem with the picture getting hung up once on the first play through, but I suspect that may have been more to do with the wireless HDMI signal transmitter I am using, or possibly just the unit getting warmed up.
I purchased the HD33 along with a new home theater reciever. I've been wanting to get a 3D display for some time and was contemplating getting one of the new Samsung 64" plasmas or LCDs. I have a nice Samsung 46" LCD that we love, but was wanting to get something a little bigger, but every time I went to actually buy one, I couldn't pull the trigger because they cost just too much in my opinion at >2000.So I kept on looking at projector central to hoping to see a 3D projector for home theater that was in a decent price range.
***Update 13 December, 2011: Emitter showed up 2 days after ordering it. Easy to hook up and the glasses synced right up for 3D. The HD quality and the 3D HD both look fantastic, the fan kicks on during 3D play and is a little loud but after a few minutes you don't even notice it. The picture is flawless and plenty bright. Mounting was easy, hookup was easy. A great deal! Now, if directv would just start offering more 3d channels... Despite a few snafus, I am very pleased with this purchase.
This projector is just plain sick!! You will never see a display like this in a projector and I had many projectors I had a optoma hd70, hd20, Mitsubishi hc3800 witch was one of my favorites. I also had a epson 6500ub and a optoma gt750e and the hd33 is by far the best out of all of them. The 3d is just plain the best out there and the blacks are very good the only reason people think the blacks aren't that great is because the projector is so bright so all you gotta do is turn the brightness down and the blacks look very good.
I thought I had an issue with my AV receiver, the sound would play but no picture via the projector. After a couple of painful weeks I figured out it was the projector. Optima makes you pay for the shipping to have it fixed! No good.Now guess what? It is not working again, not sure why but I am not looking forward to this process again.The picture is really good but I would not buy it had I known the issues I was going to have.
Answer: It does, but all I have used are 3D blu ray movies. I just used a 3D capable LG blu ray player.