Simple Renderings Thread

[Pibuz]

Thank you Nick
Ono, you can download it from the link above, but it is a SKP scene..
Which format do you prefer?

Or do you want me to pack the scene and upload a pigs file?

[dakiru]

Cool Dakiru! I LOVE the metallic dragon!
I'd really like to know how to do diffraction, if you haven't added it in postpro..
Could you post some maps? Please? i really want to test some glares!

I'm glad that you liked it, guys! The third one with SSS is rendering atm.

@Pibuz
I didn't add the diffraction in postpro, it's Indigo only. I'll post some screen shots, I hope they will clear it better.

Some info:
MLT+BiDir
Dragon size: 0.205m x 0.144m x 0.092m
World scale: 1
White balance: D65

[dakiru]

My orange juice material (now found in material database) rendered to 35,000 samples per pixel

Totally agree with Zeitmeister, it really looks very real

[Josh]

Very great renders dakiru & Whaat
I like the reflections and the blurring of the golden dragon!

[Pibuz]

Sorry Dakiru, but I really think some kind of glares are present here!
It's nothing you can control via simple tonemapping or response function: it must be a map or something.. Or something wrong is happening here!

I attach an image showing what I mean by "glares": those are basically some "imperfections" (NICE imperfections" where the light comes out of a light source, or bounces off a reflective surface. It's some kind of bloom..

Hope you can TEACH me! I'm just trying to understand how to achieve that effect, cos I really like it

[dakiru]

Sorry Dakiru, but I really think some kind of glares are present here!
It's nothing you can control via simple tonemapping or response function: it must be a map or something.. Or something wrong is happening here!

I attach an image showing what I mean by "glares": those are basically some "imperfections" (NICE imperfections" where the light comes out of a light source, or bounces off a reflective surface. It's some kind of bloom..

Hope you can TEACH me! I'm just trying to understand how to achieve that effect, cos I really like it

Aha, those glares I can turn them of and off in Blendigo before the render starts and in Indigo GUI while the rendering is in process. Now I'll make the same material, scene and all other setup as with the dragon, but with a ball. Totally everything will be the same except the model (yeah, and I'll change the exponent of the ball material from 20 to 5000 to see those reflections better)

Here how this setting looks in Blendigo:




Here in Indigo GUI: picture 1 is off and picture 2 is on






And those settings in the .igs file:





I have definitely no problem to send you the .blend file and .igs if you would like

[Pibuz]

Thank you a lot Dakiru: your screenshots are very explainatory. Thank you.
Now, looking at your settings, I try to test similar values using SkIndigo, and I post the result: nothing seems to change here..
It's HIGHLY probable that it's all my fault, though..

So, er, I ask for some tips and suggestions. Thank you all guys for your support

[cpfresh]

i think one cause you may not be seeing any results is due to your f/stop. i think it needs to be much higher. you use 2.8 and dakiru is using 32 ... hth!

[Pibuz]

..ouch: but what if I want some lens blur?

[dakiru]

Thank you a lot Dakiru: your screenshots are very explainatory. Thank you.
Now, looking at your settings, I try to test similar values using SkIndigo, and I post the result: nothing seems to change here..
It's HIGHLY probable that it's all my fault, though..

So, er, I ask for some tips and suggestions. Thank you all guys for your support

Thank YOU for such an investigation

First I tried to enter the values exactly as you did:







And this was the result:







But then one reasonable thing left. That black'o'white test albedo map on the background. A I am pretty sure it's 1.0 1.0 1.0 total white color with 0.0 0.0 0.0 total black. So, the only thing I changed then was the background surface color to

Code: Select all

<rgb>0.98 0.98 0.98</rgb> 

And the result is:



with aperture diffraction OFF







and ON







I don't see much difference. Can you, please, try it too?

[OnoSendai]

Thank you Nick
Ono, you can download it from the link above, but it is a SKP scene..
Which format do you prefer?

Or do you want me to pack the scene and upload a pigs file?

Yes, can you please export it and pack it to a .pigs? Thanks.

[Pibuz]

Attached is the SSS test scene in pigs format! report of any errors, if encountered, Ono.

Dakiru, you're actually saying that I should try with a black environment?
Yes, I can try, but I guess it should work with ALL environments, isn't it?

I'm going to do a test VEEERY soon...

[Pibuz]

Ok I'm back with some clearer results. Finally.

It seems that to achieve some valuable glares through aperture diffraction you need:
1. High aperture values, like f/16 or f/22 (which excludes any lens blur )
2. Very contrasted whites or bright points: the fact is that glares are visible only if the white points are very very bright. In a common environment this would result in a burned context (which is BAD); in Dakiru's tests the environment was very dark so it wouldn't come out burned.

Given those two facts I come here with some requests:
1. The possibility to play with the diffraction values during the rendering. They're quite difficult to set before exporting the scene, and it takes LOTS of time to find a proper setting. It would be VERY GOOD to choose curvature, blade radius and stuff when you can actually see what is changing in your image;
2. The possibility, if it is possible, to obtain glares with small aperture values such as 1.4 or 2.8;
3. The possibility, if it is possible, to obtain glares also with not-too-contrasted white points, so that we can avoid the environment burning I'm experiencing at the moment.

I attach my tests.
I tried with two different apertures: f/32 and f/1.4.
I always kept constant the environment value, and I played with the power of my left emitter only.
Thank you a lot CPfresh for your hint about aperture.

[suvakas]

I think this stuff obeys the laws of real camera?
Or am I wrong?

[Pibuz]

I am afraid it does..
Though I think that there is no useful reason to use glare only with dark (=unusual) environments.
Almost all architecture photos have glares, and they are almost everytime bright photos, not dark ones.

I think that glares have to be somehow made more visible.
I can understand the high aperture value restriction, but i'd gladly avoid to burn all my images to get to see a small bloom..