Circular matte/mask
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Hello. what's the best way to mask all video so its inside a circle? i'm projecting onto the floor (via a mirror and a fair amount of keystoning in the projector and in Izzymap) and my rectangular image is only slightly distorted - i can work with that.
now i need to create a circular image, but i'd like to keep everything as GPU as possible, so i'm trying to avoid alpha masks.cheers,john -
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Hello,
You can use Shapes and FFGLAddAlphaChan to have a variable mask (square to round and ellipse).Here is a quick sample. -
thanks Michel and Jacques. i shall experiment with your solutions.
j -
I like the way we find very different way to do the same task. I hope to see you in Berlin this summer. -
I will be there. Looking forward seeing you too, it's long time since last time.
Best Michel
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hi all,
is there a way to soften the edges of the mask with Michels solution inside the mapper?
ciao Bodo
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@Bobo
Within the mapper there is no method of blurring the mask. -
@DusX this really turns out to be a "feature" in bad need ;)
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It's the reason I proposed the shapes way, you can blur the mask…
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@jhoepffner very nice example indeed (i also use it this way at the moment) but if you need more of a complex mask (composite/ strange shapes/ sculptures ect.)
the only option at the moment is to build, scale and adjust an alpha mask from within photoshop. -
I agree with you, but there is another way, on which I am preparing a tutorial (in french first…).That's to use processing, with all the possibilities to draw and move lines interactively by OSC and receive it by Syphon. I hope it in 2 weeks. -
@jhoepffner looking forward to this :) and if its in french i hope google is my friend :)
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I made a first sample for a quadrangular mask. In Isadora, you can activate the mask, move the corners, activate the blur and adjust blurriness.With a little bit of coding in Processing, you can have more corners and even beziers vertex.I tried to comment in Processing and Isadora.Feel free to give comments, it's a prototype.Jacques -
And just for the fun, the same with 2 bezier curves.
You can move the 2 points, the 4 tangents, change the blur and change the quality.Hope you appreciate -
I just forget to say that you need:
Processing (3.0.3)Syphon library (2.0-RC2)It's possible to make an app but it's heavier and platform exclusive -
Hello again,
I'm currently in the studio with a projector and a white dance mat. my projector is rigged horizontally in the grid, with a mirror reflecting the image down onto the floor - causing massive keystoning. i've used Izzymap (tweaking the corners of a rectangular slice in the output screen) to correct this keystoning and produced a rectangular image that looks great.in a separate Projector, i've used @Michel's method above to add a mask - and the circle is nicely round, but the image inside the circle is keystoned.How can i combine the two to create a circular mask of a mapped image?(i've been through the manual, but i can't find out how to solve this particular problem)cheers,John -
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@Michel - i'll have another look tomorrow.
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ok. i found the problem. when projected, the circle mask wasn't really circular, but looked circular from where i was sat (underneath the projector) so i dropped a grid image in and mapped it so that the grid was square. it will be much easier when i've cut the floor to a perfect circle.
