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Corona vs Vray Case Study
show user profile  donvella
Did a quick conversion of an old Vray scene to Corona this morning as a test, followed Juraj tutorial on the vegetation as the colours werent quite right from vray. The rest was automatic - took about 20 minutes all up tweaking. Straight raw renders no post



more on my blog if you are interested

read 2377 times
2/26/2016 4:43:49 AM (last edit: 2/26/2016 4:43:49 AM)
show user profile  ijzerman
Cool stuff, why is your whitebalance so different?

Pushing buttons since "86
read 2367 times
2/26/2016 8:43:11 AM (last edit: 2/26/2016 8:43:11 AM)
show user profile  herfst1
Hard to tell which one I prefer... but after careful deliberation, I think the corona one is more like a photo to me. If you look at the table in the foreground, the vray one appears more speckled.
read 2365 times
2/26/2016 8:53:26 AM (last edit: 2/26/2016 8:53:26 AM)
show user profile  Octopuzzy
So what were the rendertimes?

read 2359 times
2/26/2016 9:18:28 AM (last edit: 2/26/2016 9:18:28 AM)
show user profile  donvella
ijzerman: thanks for noticing, I forgot to mention in my excitement that the white balance is different as the frame buffer in Corona is a little more flexible - you can adjust the camera exposure controls and render settings - while you render. I will also mention that the exposure is different as I have adjusted it while rendering.

herfst1: I agree, every test so far appears to me like Corona's lighting is far more intricate, I did some evermotion interiors and it picks up massive details in items such as the leaves, petals on flowers, glass refraction, lighting around fabrics and you can notice the ceiling is receiving more light around the windows and around where the tv unit would be on the wall you can see the colour bleed under the timber veneer. The timber coffee table also has a higher range of colour and seems 'flat' in vray.

Octopuzzy: glad you asked, these are both 2000px renders and from what I remember the vray one took about 45 mintues to 1 hour. The Corona render took about 10 minutes.

I will showcase a start to end render as I believe setting up the materials from scratch will produce a far better result however a 'converted' scene which is 1 click of a button was quite impressive - apart from the plants ofcourse, but this was due to the plants being 'optimised' for vray which makes them look rather shitty usually anyway. Most renders ive seen with Corona the plants look amazing - take a look at Gabriel Saunders to understand what I mean.

Another thing I have noticed is that coming from a vray background and working with a post team, they could never understand why some materials set up well in a morning scene had to be re tweaked for a dusk scene - even when correct lumen values were used for lights and camera settings were matched from photography. I never really thought anything of it - until I played with this renderer. I'm convinced that even bold colours - strong bright teals, reds, yellows will not clash as they tend to appear in real life in forms of books, bean bags, vases, feature walls etc. However a constant challenge in artistic direction is to match your 'hues' or get your values to blend well - as you can see from the colourful binds on the books this doesn't seem to be a problem, and is my next test for Corona. I want to see how colours blend together and how materials transfer between differently lit scenes. This could save me a lot of time fidgeting in either post or 3D due to a realistic outcome.

Another thing I have noticed about the lighting and detail is - that first window on the right actually had a 1mm gap between the 2 panels, this was apparent in Corona until I moved it. The light leak stopped - which meant that 1. modelling needs to be pretty much 100% accurate and 2. that the engine was able to pick up a 1mm gap and work with it accordingly. Also, the bump values and colour corrections are very noticeable on a small scale - meaning that a hue change of 2-5% was noticeable, and sometimes I have to change hues dramatically in vray to notice an affect, this is quite easy to manage in Corona

edit; one last thing I noticed was that the latest materials offered by vray on cgpress are vrscans, these are 'physically accuriate materials scanned via photography' and unfortunately as a long time vray user - I am terribly unimpressed with the results. They are flat, they do not match the photo taken and to be totally honest a let down as a 'new' technology. more on this here for examples of what I mean

read 2340 times
2/26/2016 11:55:51 AM (last edit: 2/26/2016 12:21:20 PM)
show user profile  ijzerman
Interesting thread, thnx for the explanation :)

Pushing buttons since "86
read 2323 times
2/26/2016 1:43:56 PM (last edit: 2/26/2016 1:43:56 PM)
show user profile  npcph
i just was doing the same thing with both renders. I had an exterior house scene that i created and used both render engines to compare. i thought that Corona worked great. Was real easy to setup and use was simple to setup and get a decent render. the cornona scatter was awesome for grass and trees. I was able to create an entire yard with a wooded area with ease. I also loved the coronoa active view port. this gave a full (lower resolution) render in one of the view ports including shadows. I think that the newer versions of Max has this as well, but until i get some more jobs, i'm stuck with max 2011. the limitations that i found with corona were

1. Very little in the way of resources compared to vray or mental ray. this includes tutorials and materials. I'm not an expert on materials, but can normally find a tutorial that will walk me through it. There is nothing that i can find for specific types of materials such as chrome.

2. not a lot of support for extra add-ons. for example. One of the things that i have used was sketchfab. Corona isn't supported so i had to texture and light the scene in mental ray to be able to use this.

If it weren't for these two things, i would have gone with corona over vray.

read 2303 times
2/26/2016 3:57:45 PM (last edit: 2/26/2016 3:57:45 PM)
show user profile  donvella
not sure about the support for addons as I'm only going to be using it for archviz, the plugins I need are supported - forestpro, etc. the fact everything else in max works as normal is a refreshing surprise - even the fact u can use vraydome lights.

In regards to materials I like to create them based on a template and tweak from there, I found these are a good base so far

read 2272 times
2/26/2016 9:40:29 PM (last edit: 2/26/2016 9:40:29 PM)
show user profile  Bolteon
Try to not take this the wrong way; but from the sounds of it you might not be using V-Ray the right way if you're experiencing issues like you're describing above.

Corona is a much more simplistic way of approaching rendering.

That being said, there are pro's and con's to each RS. The only thing that remains constant is that you should always use the right tool for the job.

-Marko Mandaric

read 2265 times
2/26/2016 10:21:10 PM (last edit: 2/26/2016 10:21:10 PM)
show user profile  9krausec
^Which in your case is currently MR. lol

- Portfolio-

read 2263 times
2/26/2016 10:45:10 PM (last edit: 2/26/2016 10:45:10 PM)
show user profile  herfst1
Scanline for the win.
read 2261 times
2/26/2016 10:58:50 PM (last edit: 2/26/2016 10:58:50 PM)
show user profile  Bolteon
"Which in your case is currently MR. lol"

I will be the first to acknowledge my lack of understanding for MR.

-Marko Mandaric

read 2256 times
2/26/2016 11:09:50 PM (last edit: 2/26/2016 11:09:50 PM)
show user profile  donvella
my mum said that about wearing my hat backwards, now I'm the coolest kid in town.

Your right, there is cons and pros, considering I'm solely doing archviz now lighting, materials and render time are my priority. Vray is still my go-to - as its predictable, easy to use, lots of features and well supported. Ill keep you up to date with my findings

read 2252 times
2/26/2016 11:47:21 PM (last edit: 2/26/2016 11:47:21 PM)
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