The online racing simulator
June Progress Report
(76 posts, closed, started )
June Progress Report
Dear Racers,

In the March report I described how Live for Speed has been converted to use Direct3D 11. I've now started to use some of the features that Direct3D 11 allows.

Most interesting is the image-based automatic exposure. As we have moved to more physically based lighting, allowing day to night transitions and realistic brightness for artificial lights, there are many reasons why the exposure level needs to be adjusted. Not only for different times of day but also for the lighting conditions at any location. An extreme example is when you enter a multi-storey car park on a sunny day. The exposure level must adapt to what you can see, just as your eyes or a camera would do in reality. This is demonstrated in the video below. If you don't notice it happening too much then it's working well. Without the automatic exposure it would be very dark inside or totally overexposed outside.



On the technical side, a reduced copy of the output image (that has already been generated for the bloom effect) is transferred to memory that the CPU can read. Direct3D 11 allows this to be done without waiting. A histogram is constructed so the program can estimate the exposure level to use. The brightness is then adjusted to that target over several frames.

These car parks don't have a path with pre-generated lighting values or any light probe information (yet) so I added a system to allow the ambient lighting to be calculated in real time by analysing a copy of the car's unique environment map. In the video, this allows the car to be lit by the artificial lights and avoid being lit by the sky. It's probably not the best way to get the diffuse lighting in car parks but it is a good fallback when there is no data available.

Eric has continued working on South City. It's a longer process than any of us had imagined, because he has been updating most of the buildings with more detailed architecture and opening up new roads around the city. He doesn't want to show a lot of new areas yet because there are too many holes around but some night and day shots of similar scenes are attached below.

Other updates I wont try to cover in detail include some features to help Eric in the editors and completing the conversion to Direct3D 11. Support for Direct3D 9 has now been dropped as it was not reasonable for me to try to maintain the two versions. The GPU requirements are higher now so I wouldn't expect it to run well on a Direct3D 9 graphics card anyway.

We're getting there gradually. It's a lot of work on the programming side and the content side but we like the results!
Attached images
ss1_-774246 19409133 83936 -10484 -384 0.0 60.0.jpg
ss2_-741233 19398811 84200 -12166 -456 0.0 60.0.jpg
ss3_1665289 -5106160 829033 -22392 -392 0.0 60.0.jpg
ss4_1846887 -5341356 832199 -23400 112 0.0 60.0.jpg
ss5_15078055 18568751 571238 -21416 1480 0.0 60.0.jpg
ss6_15095702 16902646 781904 -24332 1594 0.0 60.0.jpg
Quote from Scawen :...
Eric has continued working on South City. ...

omg ! Big grin Eric, keep faith, you will nail it, we are sure Omg omg omg
(screenshots and the video of it are just ... breathtaking!)
Quote from Scawen :
....
We're getting there gradually. It's a lot of work on the programming side and the content side but we like the results!

Thumbs up
Good luck ! It seems really impressive ! LFS 2.0 on the way !
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(THE WIZARD DK) DELETED by THE WIZARD DK


I see playing Russian roulette down into Turn 1 is a thing now Omg omg omg
GG
Quote from MicroSpecV :...

I see playing Russian roulette down into Turn 1 is a thing now Omg omg omg

let's guess it is only present for X and Y configurations Wink
#6 - Pasci
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(THE WIZARD DK) DELETED by THE WIZARD DK
Now is the time to wait Fern Bay graphics update Smile
Quote from Degats :Obligatory comparisons..

Thanks, I was looking for your post haha. First image seems broken btw.
Quote from LakynVonLegendaus :Thanks, I was looking for your post haha. First image seems broken btw.

Seems fine to me, it's just a part of the track that wasn't open before.
Quote from LakynVonLegendaus :Thanks, I was looking for your post haha. First image seems broken btw.

If you mean the left third of the before shot, there's a low res wall in the way Wink



Quote from MicroSpecV :

I see playing Russian roulette down into Turn 1 is a thing now Omg omg omg

Could be worse, could be the planned London F1 route Wink

Cruise servers pants just became wet after seeing this parking lot
Quote from Degats :If you mean the left third of the before shot, there's a low res wall in the way Wink

Oh right, it's so ugly it looked like a glitch Big grin
Thanks for the update Scawen, glad to see it still going strong Smile

I have some questions though:

- Why don't you generate the auto-exposure histogram on the GPU ? It's a highly parallelisable operation, so perfect for the GPU, and would remove the need to transfer data back a framebuffer to the CPU. IRC you need it for the atmospheric sky on the CPU, so you'll have only a small struct containing the final exposure to send back.

- Do you have a system to have physical light units in your engine ? Like tweaking spot light by setting it to be a 100W LED at 5000K for example. Coupling physical lights units with physical camera settings (aperture, shutter speed, etc) really add another dimension to the lighting, and creating a coherent HDR range between sun light zone (at 90/100k lumens) and the dark parking (see attachements).


For your fallback ambient solution, it actually really common, we also use the last mip of specular IBL to fake the diffuse lighting on cars, and it really does the job nicely when you don't have light probes available. Smile
Attached images
Screenshot_1.png
Screenshot_2.png
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(THE WIZARD DK) DELETED by THE WIZARD DK
Looking great, thanks for the update.
It's always nice to see some progress, thanks for the report !
Quote from Scawen :Dear Racers,


[..]

but we like the results!

Dear Racers with a capital R.. Directly followed by a demo of a parking garage. Haha.

But okay I understand its a location where you can see the effect the best and the results are looking nice so far (although the light bars look totally fake). It takes massive amounts of time but hey Rome ne s'est pas faite en un jour. Lets see what happens when time rolls into 2021 when at least another big viruswave will occur.
That graphic... whoah! But how about low-end racers? Is there any speculation of requirements to run these graphs? I know that it requires D3D11, but is there any other info about?
Damn... Everything about the new SO screams attention to detail.
I second Pedro though, I hope it won't be that GPU intensive...
You are very good, very good Devs <3
It will still work on potato PC's. It just needs to be a DX11 potato GPU. Don't think you have to worry about it, unless you're on a 20 year old PC.

Looking nice, the AO is really subtle.
anxiety strikes me again
last pic gives some throwback GranTurismo vibes back in the PlayStation days, good times
It does look really nice, but also a bit empty. No (visible) spectators besides the track or lights in the buildings in the evening / night shots.
Yeh.. Lockdown mode. Not so uncommon these days.
This thread is closed

June Progress Report
(76 posts, closed, started )
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