PDA

View Full Version : Tips to improve the realism of this outdoor scene...


Richard7666
06-21-2010, 11:48 AM
Hi guys, in order to hopefully save myself a lot of time fiddling, would anyone have any suggestions to improve the realism of this image? It's using Physical Sun & Sky with FG and GI. I have the Sun directional light casting photons, but it seems to make no difference =/
I have the sun multiplier on 0.2 and a fair bit of haze.
It's *meant* to be an overcast day lol...help?

(excuse the ground texture, it'll be covered in grass I'll composit later)

Eshta
06-21-2010, 08:24 PM
the first thing to do is to use Linar workflow
where you correct he gamma for all your textures

Richard7666
06-22-2010, 11:13 AM
Ah, okay. I'm reading http://www.djx.com.au/blog/2010/03/07/maya-linear-workflow-in-two-steps/ and http://3dlight.blogspot.com/2008/09/linear-workflow-for-maya-mental-ray.html, however they seem to contradict each other ...which method should I use?

Out of interest, how come there's no mention of this 'linear workflow' in, say, the fairly comprehensive help file entry on Pysical Sun & Sky, or any of digital-tutors.com's MR tutorials?

kiryha
06-22-2010, 11:32 AM
Use this technique [/url] [url="http://www.djx.com.au/blog/2010/03/07/maya-linear-workflow-in-two-steps/"]http://www.djx.com.au/blog/2010/03/...w-in-two-steps/ (http://www.djx.com.au/blog/2010/03/07/maya-linear-workflow-in-two-steps/)

razielsavage
06-23-2010, 11:02 AM
Hi
I have some suggestions that I said on your picture
I hope it Help you.
unfortunately the size of image is higher than upload limits i Put it on my dropbox

http://dl.dropbox.com/u/7387816/WallsTest%20copy.jpg

here is the address you can download it from there

Cuni
06-23-2010, 06:29 PM
The ground looks flat as well. Try with a bump/normal map, or even a displacement map. Put some stones scattered.

coccosoids
06-23-2010, 10:26 PM
Hi
I have some suggestions that I said on your picture
I hope it Help you.
unfortunately the size of image is higher than upload limits i Put it on my dropbox

http://dl.dropbox.com/u/7387816/WallsTest%20copy.jpg

here is the address you can download it from there

Excellent job on the tree, fence... :)

rBrady
06-23-2010, 10:40 PM
I would get rid of the physical sun/sky. I use it all the time for quick tests, but its not all that great for final renders. I would grab an HDRI of an overcast day, add a distant light if the sun ever peeks out. The ground texture res looks a bit low. Cant say I love the tree. Those are my thoughts.

Richard7666
06-24-2010, 07:27 AM
Hi
I have some suggestions that I said on your picture
I hope it Help you.
unfortunately the size of image is higher than upload limits i Put it on my dropbox

http://dl.dropbox.com/u/7387816/WallsTest%20copy.jpg

here is the address you can download it from there

Wow, thanks heaps! That's great tips there

Kabab
06-24-2010, 12:06 PM
Does anyone know of a way to do atmospheric scattering with MR?

Richard7666
06-24-2010, 01:56 PM
Okay...I've done what http://www.djx.com.au/blog/2010/03/07/maya-linear-workflow-in-two-steps/ said by using details from http://vimeo.com/11492949 because djx gave no detailed instructions.

Using djx's method, is there a way to apply these gamma correction nodes univerally to the scene? Or do I have to do every material individually?

Redsand1080
06-24-2010, 03:19 PM
Using djx's method, is there a way to apply these gamma correction nodes univerally to the scene? Or do I have to do every material individually?

There are quite a few mel scripts out there to help with this process. One is toi texture tools, another set of tools was posted at the 3dlight blog some time ago. However, after using a LWF for over a year now I've found none of these tools work exactly how I would like them to.

I've taken the past couple weeks to write a set of gamma tools that works exactly how I would like them to and makes working with gamma nodes much less of a headache. This tool set handles every situation I've run into and solves a bunch of my problems quickly and easily. I plan on sharing it in a week or so for anyone who would like to use them. There are two more features I'm going to add to the tools so I'm going to hold off on posting them up until then. But I'll let you know when they're done if you'd like.

Richard7666
06-26-2010, 12:27 PM
^keep me posted, that sounds like a useful tool indeed that you're working on!

Also, here's my 'linear' workflow versions. I used Asraf Aiad's method of putting a mip_gamma_gain on the camera as a lens shader and set its gamma to 0.455 as he does here http://vimeo.com/11492949...

Left pic I lowered the 'multiplier' on the sun/sky down to 0.1
Right pic is with the sun/sky multiplier at 1.0, same as the image I posted in my OP. As mentioned, both rendered through a cam with a mip_gamma_gain node as described above.

Are these pics sort of what should happen?

CGTalk Moderation
06-26-2010, 12:27 PM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.