Spherical World Space Normal Map - Using Math!

anonymous_user_9903fbd0 · July 28, 2014, 3:46pm

Hey community,

Just spent a bit of time developing a system for capturing 360 video content from engine.

The important bit is where we use the shader to re-unwrap a cubemap back out to a single panoramic image. It may turn out that this entire method is obselete, and theres a simple tickbox somewhere to do this, but we didn’t have much time to dig through the engine.

Shown above is a rendered world space normal map of a sphere, with standard UVs - This result is correct, but it leads to artifacting as there are compression issues with 24bit images. At this point we could have looked into HDR/Colour lookup textures (.hdr stands out, as would .exr if it was supported). We opted to look into the math behind the map, as a mathmatical solution would always be more accurate.

Might never be any use to anyone, but it just might save someone out there a bit of time, so attached is our solution. Apologies for the large image.

http://rewindfx.com/wp-content/uploads/2014/07/RWD_Spherical.jpg




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AnadinX · July 29, 2014, 4:42am

Thats pretty cool

DaveBerg · August 26, 2014, 9:12am

Wow…This is really, really useful. I’ve been checking engine forums and basically any realtime 3d software forums waiting if this would be done.

I used my time earlier this year to learn cryengine but never got to 360 renders. So… I have no idea how the code here works and how the blueprint in the image is associated with it or are they the same thing… so I got to ask how far am i using unreal engine to render eqirectangular image sequences as I’ve never even opened unreal once?

It seems that it’s quite a bit easier to import skinned characters and objects and so on in unreal than in cryengine as unreal uses fbx, so i’m not worried about the learning curve in the editor but in this custom coding that is far beyond my skills.

RewindFX, would you strip your level down leaving only the sphere and it’s shaders etc. and share your level as a template for 360 video capture?

daveb

(I don’t have subscription yet but 20/mo for this is truly nothing)

anonymous_user_4b63bc33 · August 27, 2014, 5:21am

This is really cool.
I have been working with someone who has a project that could possibly benefit from this.
keep up the good work.

BlackFangTech · August 27, 2014, 2:39pm

I love math. Nice tut!

DaveBerg · September 13, 2014, 7:11pm

Hello. Finally got subscription today and tried the math solution.

I can’t insert negative values in constant 3Vector
as it’s done in the code and image above. Any idea what i’m missing?

I also understand that final material is applied on a plane or whatever planar object
in the scene to view the equirectangular but i just cant figure out what is the texture for in the image
that has the parameter2d and the parametercube?

db

DaveBerg · September 17, 2014, 11:49pm

One more post on this one. Got it now. Took me a while to realize it is possible to paste code to nodes editor.
Anyway, this is great. Thanks a bunch RewindFX!

anonymous_user_160e49031 · September 18, 2014, 1:03am

Out of curiosity - what are you using these for? It seems like a good idea, but I can’t figure out the use.

anonymous_user_cbdc83411 · September 21, 2014, 7:54am

awesome