When using 3d max when I render something it always antialiases the background with it. In this case I am makeing fire but the black background blends in with the orange fire. Since I am putting this in a video game with multi colored spaces the black tinted parts of the animation look bad. I have clicked on the options I could find that mention antialiasing but it doesnt seem to help at least not all the way.

Any ideas? I dont mind the flame smoothing out within itself, I just cant handle the black background being mixed in.

I uploaded the max file.

I never done this, but since noone is giving you an answer, i'll give it a shot:
(i have no idea if you use after effects afterwards or not, but this is the principle)
The idea is to make sure C4D knows what you want to tread seperately, but this is normally done for editing in After effects, so i have no idea if this would help you.
The way to do this, is to right-click on the object (animated) and to add a Cinema 4D tags > Compositing Tag to the object. Then go to the Object Buffer tab and enable Buffer 1. You do the same with other animated objects and you choose f.ex. enable Buffer 2 etc...
Then in the render settings:
1. in the save part, enable the compositing project file (with some settings, dont ask me which, but be sure to choose a "save" spot.
2. in the multipass section: you choose in the channels the info you want to be rendered seperately --> in our case here that would be "object buffer" with the right ID (repeat for every buffer).

Now they should be an easier way though...
If your not planning on editing in after effects, i think it should be possible, just to exclude the background from any lighting and/or just saving the animation with an alpha channel.

But like i said, i"m not there yet, never did anything like that yet.
(my pc is too skow for animations atm.)

Let me try with a simple bouncing ball anim though,
i'll egt back to you if a find the alpha option)

im not 100% sure what you mean but if im right in assuming you want to remove the black background then this may help... if not then its a waste of 5 minutes so stop reading now

for starters, why does your animation snapshot in your original post look so pixelated?

secondly, when rendering animations i always render as a series of .tga or .tif files with alpha channels preserved. this enable you to a)take out the background later and b)if the render crashes or you want to re-render a certain section of the scene you only have to re-render those select frames as oppose to the entire animation and c)in short it just gives you more control.

so to remove the black background... this is how i would do it, but im a sucker for doing things the hard way so i dont know if there is an easier process to do this...

- create a new folder
- save file as xxxx_xxxx.tga in the newly created folder (xxxxx_xxxxx being whatever file name you choose)
- render

- once rendered open photoshop and record a new action in which you open the first image of the sequence and load the alpha channel, then delete the background from the image. save the file in ANOTHER NEW folder as a .tga and then close it. stop recording and save the action.
- file->automate->select the action you saved previously. this will do the same process for all of the images in the folder that was created from the initial render.

- open the folder with the NEW images in using after effects or whatever video compositing software you use.
- composite with video game scene


there is a tutorial on cgarchitect.com i think, which explains the process on using actions to take out background on your images for use in animations in detail. if you do not know how and cannot find the article reply here and ill find it for you.

im only assuming youre using after effects as i think scythar mentioned it in his post... i dont know if that is the case or not but the same theory behind the process stands.

anyways i gotta run now as work is over and i need to beat the traffic... im keeping an eye on this thread so let me know if im on the right track or not and if i am ill try reply in a bit more detail!