Physically Based Shader - IBL

TheMetaMorphe · Apr 2013

Hi,

I'm working on a Physicall based shader for a while now on Unity and now I think it is time to show some of my progress on it.

At the beginning I was developping a shader for a game I'm currently making on unity but more I was going deeper into it more I was thinking of making a version for folio ( my folio

).

This shader use :

HDR Cube map and Sky encoded in RGBM using a custom app to encode them from HDR to TGA.
Ambient Cube using HDR Cube map as source of illumination.
A normalized Blinn-Phong as specular term.
Mipmap for gloss reflection.

You can try a very first version of it here : http://www.charles-greivelding.com/UNITY/Ingram/Ingram.html

Use the mouse to rotate the camera around and the mouse wheel for zooming in and out.

Post Process are from Unity.

Some images :

Probes are from : http://www.hdrlabs.com/sibl/archive.html

Some usefull reads :

RGBM Encoding : http://graphicrants.blogspot.fr/2009/04/rgbm-color-encoding.html

Jason Mitchell, Gary McTaggart and Chris Green,"Shading in Valves Source Engine," SIGGRAPH Course on Advanced Real-Time Rendering in 3D Graphics and Games, 2006. http://www.valvesoftware.com/publications/2006/SIGGRAPH06_Course_ShadingInValvesSourceEngine_Slides.pdf

Gary McTaggart, "HDR in Valves Source Engine," SIGGRAPH Course on High-Dynamic-Range Imaging: Theory and Applications, 2006. http://www.valvesoftware.com/publications/2006/SIGGRAPH06_Course_HDRInValvesSourceEngine_Slides.pdf

Hoffman, Crafting Physically Motivated Shading Models for Game Development and Background: Physically-Based Shading http://renderwonk.com/publications/s2010-shading-course/

Lazarov, Physically Based Lighting in Call of Duty: Black Ops http://advances.realtimerendering.com/s2011/Lazarov-Physically-Based-Lighting-in-Black-Ops%20(Siggraph%202011%20Advances%20in%20Real-Time%20Rendering%20Course).pptx

almighty_gir · Apr 2013

was just talking about this in the G+ hangout.

can't wait to try it out!

Drew++ · Apr 2013

Good stuff man!

TheMetaMorphe · Apr 2013

Thanks guys !

I did a little update on how the camera is handle :

http://www.charles-greivelding.com/UNITY/Ingram/Ingram.html

P.S for zooming it is not Mouse Right but Mouse Left + Alt Left.

waldo · Apr 2013

I have been looking for this for Unity, posted on their forum and asked for it but no one seemed to be working on it

Is this something you are going to share somewhere when it's done?

TheMetaMorphe · Apr 2013

Yes this is something I would like to share like a sort of tool for doing assets presentations for example.

But at this stage it's only for my own use.

waldo · Apr 2013

I hope you post the shader later on.. Seems to be a awesome workflow for artists instead of the old way.

jfeez · Apr 2013

Looks pretty sick, when i rotated around the mesh i got some weird artifacts on the mesh. guessing its from motion blur or something

TheMetaMorphe · Apr 2013

I see what you mean, probably going to desable it until I'll make my own.

TheMetaMorphe · May 2013

Thanks !

Ok so it's bean a long time since my last update !

So now my shader is ok and ready to use and now I'm focusing on Skin.

It is based on a shader I did on UDK ( http://www.polycount.com/forum/showthread.php?t=98253 ).

The SSS part, based on Eric Penner's work use a lookup texture, see http://www.ericpenner.net/portfolio
Ambient use also an experimental SSS effect.

Pictures :

Infinite, 3D Head Scan by Lee Perry-Smith : http://www.ir-ltd.net/infinite-3d-head-scan-released

sheheryar_noor · Aug 2013

Isn't that what skyshop do?

airdrummer · Aug 2013

Yes...great stuff. Using it now.

http://forum.unity3d.com/threads/173412-Skyshop-Image-Based-Lighting-Tools

Fnitrox · Aug 2013

PBL shaders, PBL shaders everywhere! and they're juicy good too!

I'm so glad a lot of this stuff is coming up lately, as i wanted to get myself into a bit of coding for shaders myself to better understand what i'm doing while texturing...

and that SSS rocks!

Pabs · Aug 2013

what is this pbl stuff i keep hearing about recently?

BARDLER · Aug 2013

sheheryar_noor wrote: »

Isn't that what skyshop do?

No, Skyshop is image based lighting using HDR. This is a tad different from what it looks like.

airdrummer · Aug 2013

Great write up on IBL and Physically shaded from ILM. (PDF)

http://renderwonk.com/publications/s2010-shading-course/snow/sigg2010_physhadcourse_ILM.pdf

walreu · Aug 2013

Hello,
any possibility of sharing this shader?

larsbertram · Apr 2014

Hi there,
for anybody looking for a physically based shader framework: today Lux has been officially released on the asset store as open source:
https://www.assetstore.unity3d.com/#/content/16000

lars

TheMetaMorphe · Aug 2014

Hey,

After quit some time I've finally put together a first release of my stuff :

It consist of three main component the Dielectric, the Metallic and the Metallic and Dielectric shader.

Dielectric shader is the non condictor material ( stone, brick, plastic etc ).

Metallic shader is the conductor material ( any kind of metal ).

Metallic and Dielectric shader have both properties.

Current Features :

Forward only
Lightmap (Single and Directionnal)
PBR rendering
Specular Workflow
Metallic/Metalness Workflow
Pre integrated skin shader ( Eric Penner method ).
Probe capture tool
RGBM Encoding for cubemap ( Free and Pro )
GPU based cubemap convolution using importance sampling.
Box and sphere projection for cubemap with attenuation.

Infinite, Sphere and Box projection in action :

Next Features :

Lightmap Probe support
Billboard/Image reflection plane and its tool to capture reflection images.
Screen space subsurface scattering
Screen space reflection
Terrain and foliage shader
Wetness/Rain effect
Glass shader

Packages :

Antonov Suit v0.042 : https://dl.dropboxusercontent.com/u/1812933/AntonovSuit/Antonov Suit_v0.042_30.07.2014.unitypackage

Antonov Suit Samples : https://dl.dropboxusercontent.com/u/1812933/AntonovSuit/Antonov Suit Samples.unitypackage

This is some samples textures and materials in a scene to give you an idea on how the shader is working.

Infinite Head Scan : https://dl.dropboxusercontent.com/u/1812933/AntonovSuit/InfiniteScan.unitypackage

Infinite head scan from infinite realities allowing you to see how skin shader is working.

Sample for the specular workflow : https://dl.dropboxusercontent.com/u/1812933/AntonovSuit/MetalCeilling_04_SpecularWorkflow_Sample.zip

Change Log : https://dl.dropboxusercontent.com/u/1812933/AntonovSuit/ChangeLog.txt

Thanks, if you have any questions feel free to send me an MP or mail at antonovsuit@gmail.com.

Physically Based Shader - IBL

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