Why are my 3ds Max .fbx exports huge?

I've made an animation in 3ds Max and want to export it to .fbx and import it into Unity. I've done this once without problems. But this time, my .max file is 2,8MB and my .fbx file came out a huge 630MB!

There's nothing wrong with my model: I exported it from a Blender model (to .fbx) and imported it to 3ds max (converted it to an editable poly) to do my rigging and animation. As soon as I import some .bip animations, I get these huge files.

Is there a safe way to get smaller file sizes? I don't mind redoing the rigging if I can solve this.

• I am no expert, but it sounds to me like you are doing your export wrong. There has to be some options in the export that can control exactly what kind of data you are exporting. Just as a guess, if your file grew ~30 times, you maybe exporting every frame of your animation or something similar. So the issue maybe in the way you are exporting things. Have you tried looking at 3ds max forums on how to do this type of export properly? – Vitaly Omelchenko Apr 30 '14 at 20:34
• Hmmm.. It's true that I'm exporting every single animation frame, but as far as I know, this is the only way to transfer my animation from 3DS Max into my .fbx file and from there into Unity. Also, like I said, I did this before (just once to be honest, I'm fairly new to all this) and my exported .fbx file was just 4,5MB, all animations included.. – abracadabra1980 May 1 '14 at 9:08
• Are you using this guide by any chance? docs.unity3d.com/Documentation/Manual/… If so, try flipping various switches on and off and see how it impacts the file size. Start with bare minimum and keep adding more export options and see how it impacts your file, at the very least you will know what is causing the file to grow so big. – Vitaly Omelchenko May 1 '14 at 13:58
• Also, I found a lot of various guides just by googling : "export from 3ds max to unity animation". I don't really know what they are about, but the people who answer and make tutorial probably know a ton about it, you could try emailing them and ask this question. – Vitaly Omelchenko May 1 '14 at 14:00