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foreground object+alpha video display
i’m trying to put a video+alpha of a person walking across screen into a foreground object and then build/position a scene behind. i can’t figure out how to make the video display when you move on the timeline. it will display the correct frame when you render at any point on the timeline but doesn’t show in preview. if you assign the same material+alpha vid to a background object or a plane it shows and updates in real time correctly as you drag on the timeline, but nothing shows on foreground object until you render it. is this a limitation of the foreground object or am i doing something wrong?
i always want the video+alpha in front of the scene and unaffected by camera position so it seems like the foreground object is a good way to do it. just wondering, how does everyone handle this kind of situation?
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10 Replies
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Try Rui Batista’s (Rui Mac) Foreground-Display-Expression:
https://www.postforum.com/forums/read.php?f=6&i=113991&t=113972Just drag your movie onto the Foreground Planes Texture Tag – works like a charm,
and check Animate Preview in the Illumination Tab.Cheers
Nolan -
thanks nolan. i don’t really understand coffee but that works great, just what i wanted to do. the thread where he posted that file is almost 3 years old. i’m kind of surprised there isn’t a simple, non-coffee way to do that in R10. it’s a very useful thing.
i could sort of get the realtime view of the keyed video by applying the vid+alpha to a large plane using front projection with a “look at camera” tag on the plane, but that has some drawbacks depending on where the camera is. his set-up is much better, works like a charm. (thanks rui batista.)
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you don’t really need the Coffee anymore, drop your movie in the texture’s Color and Alpha channels and you can delete the Coffee but you do need to check Animate Preview in the Illumination Tab.
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[Brian Jones] “you don’t really need the Coffee anymore, drop your movie in the texture’s Color and Alpha channels and you can delete the Coffee but you do need to check Animate Preview in the Illumination Tab.”
Right, in fact you’ll get faster playback without the outdated COFFEE expression.
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Hi Brian, Hi Adam,
I always thought the Foreground-Object only shows up when rendering.
It was meant to place logos or copyright messages in front of your picture.
(Rui -
No special magic required here (r10.5). Just create the object and place a texture with alpha on it. Shows up in the viewport quite nicely.
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Using Cinema 4D R 10.506 / OSX 10.4.11 / iMac G5 Intel
Hi Adam,
Thanks for your reply.
I can place my texture with alpha channel on any object in the viewport and it will show up nicely without rendering, but it won -
take a look at the scene with the coffee again it’s using a plane called Foreground Plane it is not a Foreground Object.
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Hi Brian,
Thanks for clearing this up after all…
Cheers
Nolan -
i noticed it works a little different without the coffee expression. without coffee the keyed element stays unchanged in the foreground when you move/rotate the cam but if you change focal length and zoom on the scene you’ll zoom on the foreground element also and it will change. with the coffee expression the keyed foreground element is unaffected by camera move/rotate OR focal changes, which for my purposes is a good thing since i wanted the keyed video to stay in the screen position where it was shot no matter what i do with the c4d cam.
both are useful and either way you can see the keyed foreground video live when you move on the timeline, which is quite handy. thanks for all the info.
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