I'm trying to export a simple camera animation as an FBX out of Houdini. The animation consists of keyframes for translate and rotation at the start and end of the sequence. The interpolation between them needs to be constant, so has been set to linear.

Inside the animation editor in Houdini it looks like this (only translate shown):



However, when I bring this into my game engine, I can see that easing in and out has been added to the animation data. So if I reimport the FBX back into Houdini and look again in the animation editor, it looks like this:



Why has the animation been eased during export? I can't see any settings on the FBX export menu which could explain this.

I can get around the problem by baking the animation before exporting. However, I am doing this for a web-based game engine (Playcanvas) so file size is important. Baking the animation basically triples the size of the resultant file.

I've attached a hip file.

Anyone know why this would be happening?