Modern bedroom Visualization, Vray GPU

[fixeighted]

Just as an addendum to all this good info, a nice video showing/explaining this, which may help others https://www.youtube.com/watch?v=BagZ...el=MographPlus

Mainly here for my reference until I get it all forced into my brain as muscle memory

[Muhammed_Hamed]

fixeighted Thanks for sharing

He did a great job honestly, and overall the workflow in Vray is very basic hence I recommend all people to adapt. One thing I wish he stressed more is Wide Gamut Rendering, which doesn't usually get enough credit
Many people think about the ACES look in the Frame Buffer as a LUT, similar to the tone-mapping layer in the frame buffer(like what he mentioned)
On using ACEScg as rendering color space.. there is a meaningful difference on GI and anything that deals with bounces like SSS, hair..etc

Some mathematical operations because of the nature of linear algebra and matrices are dependent on the given RGB colourspace primaries, i.e., on the colourspaces basis. The same operations performed in different RGB colourspace will yield different tristimulus values once converted back to CIE XYZ color space. For example multiplication, division and power operations are RGB colourspace primaries dependent while addition and subtraction are not

ACEScg is superior for CGI rendering, uses much wider gamut compared to Linear sRGB. This Cornelbox scene is very simple, yet shows difference in GI between ACEScg vs sRGB (ACES is left)
https://imgsli.com/MTUxMzY
And this is the GI pass for the same render,
https://imgsli.com/MTUxMzc
And this,
https://imgsli.com/MTUxODM
https://imgsli.com/MTUxODI

Corona uses the original XYZ color space for rendering internally, and Fstorm uses some special color space(hence you will see people praise their GI and overall look, and tone mapping being another side of that).. And now Vray + ACEScg catches up and pulls ahead(this color space is made specifically for CGI rendering by the color scientists and engineers of the Academy), it gets us closer to spectral rendering in some ways


Best,

Muhammed

[fixeighted]

One issue I'm trying to get my head around is that aces makes everything much much darker, so does that imply we need to completely rework lighting, upping multipliers to compensate, or am I missing something more basic than that?
This an interior using only an hdri.

[Muhammed_Hamed]

One issue I'm trying to get my head around is that aces makes everything much much darker, so does that imply we need to completely rework lighting, upping multipliers to compensate, or am I missing something more basic than that?
This an interior using only an hdri.

I tend to use higher intensity for my lights, compared to the time I rendered in sRGB. This is normal, it is about the ACES Tonemapping which has a lot of contrast. Some people like it and some people don't, it is personal preference
For me personally, I got used to the ACES ODT look and I don't mind working with it

Make sure your HDRI has the correct IDT like this,



And these settings for 8bit jpeg images for diffuse or translucency



And on another note, if the contrast is way too much you can swap the frame buffer to sRGB and use a filmic tonemap layer.. then swap colorspace to ACEScg, this way you build your own custom view transform to your liking.

https://www.youtube.com/watch?v=1mcE5cJ198U


Both ways are fine on using ACES workflow

[fixeighted]

Yes I made sure to have everything set in terms of correct spaces for textures etc.
I've been using filmic since Vray 5 dropped - that was a great improvement feature, so I guess I'm
now thinking I'll stick with just that, if it's essentially the same implementation but in a slightly nicer slidery
UI way

[luisgamino2]

Hi Muhammed and fixeighted
I Like a Lot how ACES look in interior spaces, i agree there are a Lot of changes with ACES cg, lights and colors looks really amazing, as You already pointed Muhammed its better to wait for a real support for ACES cg in Vray 5 for sketchup, i hope in the next update, i have some proyects that i want to render in ACES.

Thanks for your advices Muhammed and fixeighted

[fixeighted]

I'm sure it won't be too long. Sketchup is a very big part of the market these days, so that provides a certain imperative I reckon
Not that I know how hard it is to implement...I can't code a bit (pun intended )

[seq]

Hi Muhammed,

do you use PSD for your post work? Or Nuke?

Do you have any recommendations for working with 32bit EXR ACES files in PSD? I know that PSD is in no way optimum for editing 32 bit images and least of all if you use the ACES workflow. But for now we have found no other real option to edit hundreds of product shots. We use the workflow from Jonas Noel (https://m.youtube.com/watch?v=dksSrFWxLr4) and it gives us an nearly identical result as in the VFB with OCIO. But PSD is getting really slow when you want e.g. editing a curve corrections.

We also tried the approach from Alex Fry (https://community.acescentral.com/t/...-workflows/136), but that was not as close to the VFB result as with Jonas way.

Thanks for any further tips+tricks.

Best,
Lars

[Muhammed_Hamed]

do you use PSD for your post work? Or Nuke?

Hi Lars,

I have used Nuke and Photoshop with ACES system for quite a while, depending on the job usually because not everyone has access to Nuke

We use the workflow from Jonas Noel (https://m.youtube.com/watch?v=dksSrFWxLr4) and it gives us an nearly identical result as in the VFB with OCIO

Jonas's video is based on my forum thread about ACES workflow in Photoshop, and in the same thread I explained Alex Fry's method as well. Which gives identical results to the Frame Buffer(it should offer better performance than using 2 LUTs, maybe unless you work with massive resolutions and this becomes Photoshop's fault again)

Other than these 2 methods, I don't know of any other way. Sorry
Nuke is able to handle large number of files, and you can automate this process with scripting

but that was not as close to the VFB result as with Jonas way.

Can you upload me an EXR and Photoshop screenshots, it should match like what I explain in my thread above

Best,
Muhammed

[seq]

Hi Muhammed,

here are the two screenshots from PSD: one without view transform (both images looks the same) and one with the workflow from Jonas and Alex (images looks different especially the blue and the red part).

You are right: With only one LUT PSD reacts a bit faster. But why are the colors so different?


I think we will test Nuke for our purpose. Anyone has used NATRON? Read that people are also using it for 32 bit still image editing.

Best,
Lars

[Muhammed_Hamed]

Hey Lars,

Can you upload me this EXR so I test on my side with Alex's method, I have used it in the past and it should be 1 to 1 match
There might be a setup issue on your side

I don't have experience with Natron, on the other hand I think Nuke is gonna handle this well. Let me know how this goes

[seq]

Hi Muhammed,

I guess the mistake is in our setup. So, thanks for taking a look. Attached a part of the image as 32 bit EXR from V-Ray.

We will look onto Nuke and see how it can help us.

Best,
Lars

[Muhammed_Hamed]

Hey Lars,

Sorry for the late reply, we had update 2 release yesterday. I tested your EXR and I'm able to get a perfect match
Please take a look at this video on how I set this up

https://www.youtube.com/watch?v=xac7XCg1Crc

Let me know how this works for you seq

Best,
Muhammed

[stezza]

Hi Muhammed
As rendering with OCIO config isnt supported in the cloud yet, what is the process of rendering in the cloud then applying the OCIO in the VFB locally?
There is something in the process I'm missing. I render the image as sRGB in the cloud then download it and apply OCIO locally but get a totally incorrect result.
What am I missing?
Maya prefs set to use default ocio and VFB points to same file, VRay set to use Maya prefs.

Thanks for any help.

[seq]

Thanks a lot for your effort, Muhammed.

We had used the wrong ICC profile. Now the two workflows match perfectly.

For any Mac user: The ICC profile needs to go there -> /Library/ColorSync/Profiles