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rlk / envtools

Utilities to manipulate spherical images
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Explanation about dome remapping #9

Open cfoch opened 1 year ago

cfoch commented 1 year ago

Hello. Could you please explain why if I apply remap to the rect picture, I get a fully circular dome, that can be used as a texture in a hemisphere 3D object:

./envremap -i rect -o dome etc/rect.tif out/out3.tif

output

However, if I remap the fisheye (hemi) to dome, I get half of circule projection:

output2

Could you please explain how can I remap a fisheye 180 degrees picture to a dome image? So I can apply it as a texture to a 3D object: Screenshot from 2023-07-14 13-29-58

rlk commented 1 year ago

Quite simply, a planetarium dome is expected to depict the sky above you, while a fisheye lens is expected to depict the scene in front of you. So, if you projected that half image onto a planetarium, you would indeed see that group of people in front of you.

You should be able to simply use fisheye and dome images interchangeably without converting between them. If I recall correctly, they're the same, except for their implied orientation.