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				pt vs pmc
				Posted: Sat Jun 09, 2012 7:56 am
				by gabrielefx
				more renders to come
edit:
few adjustments on each still.
			 
			
					
				Re: pt vs pmc
				Posted: Sat Jun 09, 2012 9:15 am
				by Pullakk
				Amazing as always. 
How did you do that carpet...that must be modeled.
			 
			
					
				Re: pt vs pmc
				Posted: Sat Jun 09, 2012 5:03 pm
				by gabrielefx
				Pullakk wrote:Amazing as always. 
How did you do that carpet...that must be modeled.
thank you,
it's Max fur
 
			 
			
					
				Re: pt vs pmc
				Posted: Sun Jun 10, 2012 6:46 pm
				by paoloverona
				Amazing job Gabriele!  
 
I like your comparison between PMC and PT, all settings and materials where leaved the same?
why the toothbrushes in PMC doesn't have any color?, and why such a difference with the soap and perfume bottle refractions?
I'm in love with your last render, render time? 
waitnig for your next job!   
 
Saluti,
Paolo
 
			 
			
					
				Re: pt vs pmc
				Posted: Sun Jun 10, 2012 7:39 pm
				by gabrielefx
				paoloverona wrote:Amazing job Gabriele!  
 
I like your comparison between PMC and PT, all settings and materials where leaved the same?
why the toothbrushes in PMC doesn't have any color?, and why such a difference with the soap and perfume bottle refractions?
I'm in love with your last render, render time? 
waitnig for your next job!   
 
Saluti,
Paolo
 
Hi, I did few adjustments on objects position and materials
The full resolution renders are at 2560x1810
PMC 10 hours
PT 7 hours
PMC renders have less noise but you need more hours
What I have discovered is:
In the case we have a good illumination we should select the PT kernel, on the contrary we will use the PMC.
I analyzed the best renders created with Arion and iray. The users don't use tiny emitters and use hdrs. They don't put in the scene the ceiling.
If we render an object inside a closed box we will get few samples/second. If we delete the ceiling and put an hdr the samples will be 10X more.
 
			 
			
					
				Re: pt vs pmc
				Posted: Mon Jun 11, 2012 9:35 am
				by paoloverona
				super!, yours tests are lot helpful for the refractive's community  
 
...unfortunately most of the time the ceiling couldn't be "hidden", should be fantastic if inside octane there was the option for the objects to don't cast shadows  
 
hoping the best for the next releases of octane.
Saluti,
Paolo
 
			 
			
					
				Re: pt vs pmc
				Posted: Tue Jun 12, 2012 10:31 am
				by lenreed
				About that - you can set a slight transparency to the ceiling and the render will be faster and still see the ceiling.
			 
			
					
				Re: pt vs pmc
				Posted: Tue Jun 12, 2012 12:04 pm
				by gabrielefx
				lenreed wrote:About that - you can set a slight transparency to the ceiling and the render will be faster and still see the ceiling.
It's a good tip!
I use the same tip to create a slight transparent hemispherical sky passed by the sunlight.
 
			 
			
					
				Re: pt vs pmc
				Posted: Wed Jun 13, 2012 4:23 pm
				by lzanlorenzi
				great work as always gabrielefx. but 7 hours with 4 gtx 480.. is too much, no? i think you have same results using biased renders, like vray in brute force mode. just my opinion. 
hugs
			 
			
					
				Re: pt vs pmc
				Posted: Thu Jun 14, 2012 6:54 am
				by gabrielefx
				lzanlorenzi wrote:great work as always gabrielefx. but 7 hours with 4 gtx 480.. is too much, no? i think you have same results using biased renders, like vray in brute force mode. just my opinion. 
hugs
Oh yes.
If you look at the render with the rotated camera you will notice a more natural illumination.
The other renders were illuminate with 3 rectangular lights (two hidden) behind the camera.
I don't like artificial or tricky illumination, these results are similar to many Vray renders I do.
In Octane the light is distributed naturally, it goes everywhere.
In Vray using bruteforce for primary and secondary rays you can't achieve natural illumination using only one sky portals and two thin emitters behind the mirror.
In Vray you will get splotches, dark areas and a lot of noise except if you pump the dmc sampler.
Gpu render it's in a early state. I'm waiting for the next Kepler gpus to get 3x performances.