one projector two surfaces, keystone?

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one projector two surfaces, keystone?

Postby tontheaterbasel » Thu Mar 03, 2022 7:37 pm

Hi there,

we have one projector covering two surfaces and would like to do a keystone correction for both surfaces separately.
I tried creating two 2x2 meshes, but there is no option for doing a perspective correction, hence the lines in the testpattern get all curvy.
How would you go about this?

Best regards,
David
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Re: one projector two surfaces, keystone?

Postby Daniel Kaminski » Sun Mar 06, 2022 4:35 pm

Can you post a simple hand drawing of the setup?

I think you will need a 2 3x3 Meshes.

Daniel
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Re: one projector two surfaces, keystone?

Postby tontheaterbasel » Sun Mar 06, 2022 9:31 pm

Hi Daniel,

thank you for your answer.

Imagine the picture is taken from the point of view of the projector ( yes I am traveling in France at the moment :) ) and the books are the surfaces I want to project on.
I would like to have two surfaces, that do a keystone correction.
I tried with 2x2 and 3x3 meshes, but the lines of the test grid get curvy.
In MadMapper for example there is a switch to toggle between mesh warp and keystone correction for each mesh.
That is what I am missing here.

Best regards,
David
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Re: one projector two surfaces, keystone?

Postby Daniel Kaminski » Tue Mar 08, 2022 9:21 pm

I see,

I do not know MadMapper.
Best Way in Pandoras Box will be

1 Mesh with 2 Submeshes.

Each Submesh with 3x3 Points, Place the Corners first and than align the Outside Middelpoint and the center Point.

There is no way to toggle the behavior of the FFD like you described at the moment.

Daniel
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