Dealing with cylindrical correction of volume anamorphosis

[lupaz]

Hey guys,

Does anyone know if there's a way to correct cylindrical distortion from renderings within 3Ds Max?

[maru]

If you create a Corona Camera, you have "distortion" rollout there and you can control the cubic distortion amount manually. The drawback is that when using extreme amounts you will end up with a circular crop in your rendering. I am not aware of any "automatic" way to do it.

[lupaz]

Hm. Thanks Maru.
DxO Viewpoint has a pretty cool feature to correct this. I wonder if Corona could have a post effect that uses a similar algorithm. Just an idea,

[piotrus3333]

try this texture as distortion map in camera:
https://we.tl/8G2rSuMg8m

1920x1080 resolution should work best with this one.

[lupaz]

try this texture as distortion map in camera:
https://we.tl/8G2rSuMg8m

1920x1080 resolution should work best with this one.

Thanks Piotrus! The image gets the barrel look with that map, which for architectural images is a no no.

[piotrus3333]

it's just a sample made for 8mm lens camera so the look is pretty extreme. the point is you can put any projection you can imagine into texture like that.

[lupaz]

Aha
I hope I'm not one of those that ask questions that can be answered with 5 minutes of googling, but:
How do you make those textures?

[piotrus3333]

add two gradients. black to red and black to green. red gives you X and green - Y. render that in resolution you need.
16bit minimum and full float optimal - you need separate values for all the pixels in the image and accommodate for distortion.
than distort it to your liking with whatever software you have (example attached).