evilproducer - 14 July 2012 10:29 AM
...Perhaps the best way to get animated Carrara trees into Blender or any other app. is probably to render the animated trees in Carrara with an alpha channel and use that for billboards in your program of choice. Yes they’ll be 2D, but depending on the camera movement, you might be able to work around it.
Game and VR software deal with billboards by maintaining planar surface of the billboards pointed towards the camera. One could achieve this in software by doing a ‘point at’ on the billboards. Often though, pointing at the camera isn’t enough but rather one may need to create a null attached but displaced from the camera to maintain the proper orientation. Finally, one can even swap ‘point at’ targets in the timeline. I haven’t tried this in Carrara but it might be worth trying. Finally, there is the issue of shadows, those would need to be dealt with separately if the trees are close enough to have shadows that would be noticeable. For them, the direction wouldn’t change with camera movement but the size might. Also, one might need to do something like pwCatch to handle planar shadows over surfaces.