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I could try to program it myself, but it wouldn't be perfect. I don't know if there are big lots of tools that are capable of mixing 2D Avis with 3D FX with multiple layers. The whole thing could then be saved as an Avi or a sequence of images, depending on the 3D app you would use. then 2D-layer 2 that contains the trees only. The easiest way to achieve this is using a 3d tool that creates nice looking explosions and is capable of using additional 2D layers, eg: background layer (original shot), then 3D-explosion with proper transparency etc. But the flames, smoke and dust look bad when masked. Rock, Stones and other particles may not be a problem although you may get a nasty sawteeth when you simply mask them. You still can do this frame by frame in photoshop, using 32bit TGA with Alpha channel. I don't know if your tool does support this. Or even better, an explosion with alpha-transparency. So on video track 1 you have the original shot. You can do this in photoshop, but it's hard to mask things nicely when the material is interlaced, esp. If the camera moves, you need the entire shot as a masked version. If the camera stands still, you can use one masked frame for the whole shot. While Carnage7p may be right when he says you should get better tools the sooner or the later, you probably need a solution for your current tool too.Īs UFProductions said, you need to create a masked layer of the trees in the foreground.