Reverse perspective rendering

brothermechanic · March 7, 2021, 4:29pm

Very cool test!

sozap · March 20, 2021, 7:55pm

That’s awesome ! do you plan to propose this feature as a patch for inclusion in master ?
Looks like a great way to get interesting images!
Congrats on your work, this looks like blackmagic to me !

Mais · November 5, 2021, 12:35pm

Could you please update patch for the new version? I tried it with Mac OS but the blender.app comes now with Alpha 3.1.version and I couldn’t process it further.
Or maybe could you possibly make the one for the Window version?
I really appreciate your wonderful patch and would like to try it!
Thanks in advance

anon20675008 · December 8, 2021, 12:02am

Sure. I plan to do this in January 2022.
Do you have any suggestions for improvements to be included in the patch?

Ruy_Mascarua · December 8, 2021, 7:02pm

Hello sungreen! It’s very exciting to see a reverse perspective implementation in blender, I’ve been studying and experimenting physically with reverse perspective lenses for a while. I think this implementation could have a huge impact in the way we represent things thru perspective, so I consider very important to give it flexibility in order to achieve new ways of seeing objects. I’ve noticed a few things that would be nice to include in the patch:
1.- Reverse perspective defined by angle degrees: This means how much the camera covers around the object. The reference could be a 1m object at 1m away from the camera. You could also define reverse perspective by the size of the lens.
2.-Separate X and Y reverse perspective amount: To have the option for only affect X or Y axis in the perspective, similar to anamorphic lenses but in reverse.
3.- Sensor size: One thing is the lens size but if we change the sensor size the effect can become more extreme, very useful in some situations
4.- Curved camera?: Would it be possible to have a 360º reverse perspective??? In real world I’ve only achieved 180º because of the nature of flat lenses that cannot “wrap around” the objects.
5.- Finally. Would it be possible to affect the reverse perspective effect with a grayscale depth map? that would help to use different amounts of reverse perspective from the same point of view.

I hope being clear
I’m very interested to use this patch in Windows. I’m also very glad someone like u have taken the time to make this patch.

I’m sure this patch will be implemented on blender, later or sooner. Artists are getting deeper into these new ways of representation. Thank you very much for doing this!

I’d be very glad if u want to contact me to talk about this subject with more detail:
email: [email protected]
Instagram: ruy_mascarua
Facebook: Ruy MacRuy Osbahal

anon20675008 · December 10, 2021, 4:06am

I agree that of the above, it might be worth discussing. Now I am doing a reverse perspective on this code, which I myself came up with

The essence of the code is that traditionally the perspective matrix in blender has two states - perspective view and orthogonal view. I added a parameter from -1 to 1, which smoothly changes the view from reverse perspective to perspective, and 0 is a special case comparable to orthogonal view. Do you have any suggestions for modifying the code? What parameters do you need to add?

anon20675008 · December 22, 2021, 3:18am

The link is a preliminary version of the patch with the current functionality. There are mistakes in the work, but in general, you can get the effect of reverse perspective. Bug reports are welcome.

patch for blender 3.10 https://gitlab.com/sungreen/rcam3/-/blob/master/rcam3_310_20211222.diff

Rodrigo_Favarete · June 16, 2022, 3:36pm

Hey @anon20675008 amazing work! Can you share your builds for 3.10? I’m having problems building my own version. Also, do you plann to make this an addon or something?

anon20675008 · July 22, 2022, 10:22am

I plan to update the build during the upcoming 2 weeks.

Miso_Barosi · December 5, 2022, 3:33pm

Hi @anon20675008!!!
amazing work that you have done here!
Would you mind making one of your builds for windows available for the public?
I’m not really into programming and for sure don’t have the skillset to build it myself.
Keep up the amazing work!
Thanks!

anon20675008 · January 1, 2023, 12:01am

Unofficial build of blender 350 with rcam3 patch. Download and unpack archive pack_rcam3_350+demo.zip https://disk.yandex.ru/d/8yZnB9Qu7RIVBA or https://blender.community/c/graphicall/ej8z/ . Run rcam3\blender.exe and open demo file demo\chess_animate.blend

Demo video