OTOY Forums

Hello all,

a nice sportscar, never be produced in series, even if it should be...
And yes, it´s inspired very much by this great artist http://niuqcam.blogspot.de/

https://vimeo.com/89323044

[vimeo]http://www.vimeo.com/89323044[/vimeo]

Hello djart,

nicely done! Like the evening mood!

Any details about the kernel used? Render Times?
And the lighting...are the back and front lites supported by IES lights? (for the shine on the floor?)
Is this a fully geometry scene or a well done mixture of HDR Background and front geomtry?
You are using C4D?

Which glass material did you use? I get strange perspective shifts with specular glass materials, but didn`t manage to get nice reflections with glossy fake glass. Would be nice to see your glass material settings.

Keep the good work up,
ChrisVis

Hi ChrisVis,

thx for your reply. I hope my answer to your questions will help you.

At my first tests i had the same problem with perspective shifts on the carwindows too.
I got rid of it using a falloffmap in the opacity channel. You can also use a mixmat and place the transparent glass without any index
and put some glossymat only for reflection... (i used this for an upcoming test on interiour animation)

I attached all the glassmaterials and front/ backlights as a c4dfile, so you can check by yourself.
"jaguar_racecar_matsetup_c4d"
The back and front lights are simple octane arealights. See attached image "jaguar_octaned_lights"

The scene itself is a mixture of Closeup surrounding geometry and HDR. See attached image "jaguar_octaned_racetrack"

Its all rendered on 1xtitan/1xgtx680 with directlight/AO on 1200 Samples.
The average rendertime is 80 seconds/frame + some colorcorr. in AE.

cheers,
djart

Hi djart,

thank you for your reply and the detailed insights!
And thank you for the glass material tip and settings... falloff map in the opacity channel, thats what I have been searching for... but didn`t find the right post in the forum yet.
Very helpful!

I wonder why real octane glass behaves like this with perspective shifts. It is a bit strange in my understanding of index of refraction and light refraction.

Rendertimes are quiet good and it is looking fine for directlighting kernel.
Did you try to do a PMC Still rendering yet? Would be nice to see real photos form this nice Race track scene

See you,
ChrisVis

ChrisVis wrote: Rendertimes are quiet good and it is looking fine for directlighting kernel.
Did you try to do a PMC Still rendering yet? Would be nice to see real photos form this nice Race track scene

Hi ChrisVis,

i am sorry to say but for this scene it dont makes any difference to use pmc or else. I did a comparison and for there is not even a small difference.

Mostly i start with directlight AO, if i dont need much colorbleed effect. Then i switch to directlight diffuse, pathtrace and pmc.
At the end i always come back to directlight AO or diffuse, wich does a good job. If i ever need glass/ caustics... i use a different engine for render that effect and do some compositework.

cheers,
djart

Hi djart,

ok, most of my work so far I also did with directlight and AO... when increasing AO to like 20 or 30 it mostly looks like pathtracing for me, except for glass of course, as you said.
I did some comparisons with my scenes and have seen some improvements with PMC in terms of reflections and the look of the car paint that add realism.

Cya,
ChrisVis