32bit and AA problems in Mental Ray

[dagon1978]

By the way, I’m getting decent results inside Maya in the Render View with the first Preview option turned off and the second one on, ie

• turn off ‘preview convert tiles’
• turn on ‘preview tonemap tiles’

Then, I can use gamma, tonemapping and RGBA (half) 4x16 bit.

But, it might just be the scene I’m using.
And I haven’t checked how the preview image compares to the actual file written out.

i’m getting good results in the renderview too, with both the option turned off… don’t know… but i’m so happy now!!

[jupiterjazz]

yeaaaaaaaaah!! now it’s working fine!! :applause:
thanx paolo, thanx bart
ciau
mat

very well!
BTW, I thought about starting a blog that allows me to post something very quickly, hence, guess what, I did it: http://blog.jupiter-jazz.com (in a rage of excitement I just added somethig about this issue… will be probably extended).
I will post here some TRIXR4KIDZ + random lollies&follies.
Of course bounded by the two magic words: “time allowing…”

p

[jupiterjazz]

i’m getting good results in the renderview too, with both the option turned off… don’t know… but i’m so happy now!!

yes, ofcourse, BUT this is NOT a fp buffer, hence your data is already in 0—>1 range. you cannot RMB and save an EXR from the renderview: only regular formats here.

if you need to tweak your data in post rely on the rendered file on disk.

p

[pantich78]

very well!
BTW, I thought about starting a blog that allows me to post something very quickly, hence, guess what, I did it: http://blog.jupiter-jazz.com (in a rage of excitement I just added somethig about this issue… will be probably extended).
I will post here some TRIXR4KIDZ + random lollies&follies.
Of course bounded by the two magic words: “time allowing…”

p

Good Paolo, I like your idea about the blog!

Alessandro

[dagon1978]

a like your blog!
very helpfull
thanx for all trix

[techmage]

so: avoid relying on maya do the tonemapping and do it yourself in post. in mental ray renderglobals> preview:

• turn off ‘preview convert tiles’
• turn off ‘preview tonemap tiles’

(ah: note that if you turn off only the second you will have hot pixels for the areas over the range 0–>1, sort of a diagnostic mode if you want)

don’t care about the image in the renderview (which is not fp) and get the *_tmp.exr file that maya generates in your project images’ folder (or render with batchrender and get the *_tmp-less .exr file which is written). If you open it with imf_disp you’ll see it’s an 4x32bit (half) .exr

If you’ll open it in - say - photoshop you can tonemappit yourself and you have no aliasing.

Same if you render in standalone.
I can’t attch an archive bigger than 97 kb here… so get it from here: http://www.jupiter-jazz.com/temp/room.zip (it contains the .exr and a posttonemapped .jpg with no aliasing

have fun!

p

ps when tonemapping in maya the aliasing though shouldn’t happen, you might log a bug through the proper channel: Alias.

following this exactly works great for me. But when I do a batch render the same problem comes back, is there anyway around that?

[Tlock]

Why don’t you try rendering your output to HDR then once rendered bring the final image into Artizen HDR and use anyone of the 5 tone mapping methods.

-Linear Conversion - Free
-Lock Linear - Free
-Dynamic Range Max - Free
-Dynamic Range Channel Max - Free
-Reinhard - Free

Then once you like your final results just save your image into any LDR format Artizen supports.
www.supportingcomputers.net

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