Blackmagic Forum

I have a video of a spear falling to the grassy ground and goes down into it some. I want to replace that spear with another 1. Here's my current plan:

1) since it can't be qualified, track spear 1 in the Color window in order to remove it
2) track the same spear in the Fusion window for tracking data
3) put the second spear behind the scene, since the end of the spear will pierce into the ground and disappear.

Is this the best way? And any way around tracking the same object twice, once in Color, once in Fusion?

Thanks.

Why not remove it in Fusion as well? Why the two steps? I am not sure if I understand what it is you're trying to achieve.

Sander de Regt wrote:Why not remove it in Fusion as well? Why the two steps? I am not sure if I understand what it is you're trying to achieve.

Wasn't sure how to remove a moving object in Fusion, leaving transparency in its place. Can I use the tracking data on a mask or matte (?), the same way as on an object I want to place in the video?

I want to remove and make transparent where an object is, so there can be a new object in the background showing through where the original object was. I need to do this because something covers up the object part way through the video.

deebers35 wrote:Wasn't sure how to remove a moving object in Fusion, leaving transparency in its place. Can I use the tracking data on a mask or matte (?), the same way as on an object I want to place in the video?

I want to remove and make transparent where an object is, so there can be a new object in the background showing through where the original object was. I need to do this because something covers up the object part way through the video.

You are approaching it backwards. Instead of punching a hole to show other element from behind simpy merge new spear on top of your footage. Makes much more sense. And if your new spear does not cover the old one, just clean up your footage before merge, for example cover the old spear with piece of BG taken from a time frame before it landed.
If something covers your spear, you need to place that element on top lf your new spear: mask it from original footage and merge it on top. Work from back to front, placing elements in their depth order. This kind of arrangement is much easier to follow and fix.

Hendrik Proosa wrote:

deebers35 wrote:Wasn't sure how to remove a moving object in Fusion, leaving transparency in its place. Can I use the tracking data on a mask or matte (?), the same way as on an object I want to place in the video?

I want to remove and make transparent where an object is, so there can be a new object in the background showing through where the original object was. I need to do this because something covers up the object part way through the video.

You are approaching it backwards. Instead of punching a hole to show other element from behind simpy merge new spear on top of your footage. Makes much more sense. And if your new spear does not cover the old one, just clean up your footage before merge, for example cover the old spear with piece of BG taken from a time frame before it landed.
If something covers your spear, you need to place that element on top lf your new spear: mask it from original footage and merge it on top. Work from back to front, placing elements in their depth order. This kind of arrangement is much easier to follow and fix.

so it still leaves me with having to track the first object, which gets covered on and off? Then I need to use a second planar tracker, this time to track the objects that will be covering the spear? To construct that, do I use a mask when selecting? matte? In the color window I know it's a power window, not sure what in Fusion. Anyway, this way seems 2 be harder, as I need to track the object and then the items that pass over it?

Tracking the original object is the toughest part, as it sometimes gets fully covered. Not sure what to do when it is fully covered then comes back into view. The tracker polygon shrinks away to nothing and off-screen, then I have to reset it as the object comes into view?

Thanks.

Does your new spear fully cover the old one (is it big enough)? If yes, just animate new spear over it (with some help from tracking if possible). And then mask off those parts of new spear that should be behind some object.