First of all, I want to thank the corona developers for such impressive rendering engine, really nice results in a few clicks!
I’m an intermediate Vray user, but in this two days I gave myself the opportunity to try Corona, and get easily involved, after looking the galleries with user’s works, I guess it’s time to move on…
I share with you my first test image for a WIP scene, very basic, but I would like to improve with your opinion ans suggestions, as well to ask some questions:
Corona was set to default values, except for
-LUT Gamma, enabled to 2.2
-Exposure: 9
-Highlight compression:30
-PT samples: 1024 (I read somewhere it can improve image quality)
MATERIALS
I just import some vray objects and convert materials with DeadClown’s Advanced Corona Material Converter (Corona Material/Lights Converter (legacy) - User Contributions - Chaos Forum) but I noticed items must be un-grouped previous to convert them, is a bug?
once converted materials lost specular levels or difusse maps are not correctly shown. please look at the plants
LIGHTS
Is there a way to hide the “solid volume” from corona lights? I mean, is kinda annoying to add some lights on windows and then get a solid volume which doesnt allow me to see thru the scene. Something like “wired” or non-solid light?
It makes me wonder: Is it really needd to add some lights on windows or spherical lights for interior scenes? at the end I just used a HDRI map as only light source.
CAMERAS
I love the option for correcting white colors with color maping post process in real time, but some times, depending on lights sources I have to change those values each time I need to get a new image, also, by doing this way, I will not remember the settings for each camera :(.
Plase add something like vrayphysical camera, in order to control DOF, Exposure, Highlights, contrast WB and so on. Please add the option for controlling those values on camera while rendering too, its a cool option!
OTHER
I set the same rendering time from my vray scene in order to compare image quality. As you can notice, Corona image seems to be more “blurred” at background.
There is away to improve or change Antialiasing? how can I clear noise?
This guide above should be cut out, saved as a PDF and shipped with all future alpha’s - and maybe better be shown as a text box once you change render to Corona (with the option of hiding it once and forever, once you’ve got the general idea)!
Good work, Rawalanche - I look forward to the Corona beta’a, where I understand that you will be the author of the documentation.
First, I want to thank Rawalanche for those value tips, not only for me, but also the whole community
I will try your sugestions and post results nex week
Sorry for writing in capital letters, didnt want to be rude.
Just two more questions:
-concerning about albedo value, what do I have to change? difusse or reflection level?
-concerning about mergin objects to scene: do you suggest to re-make all materials, one by one… :S ?
ps. I start the scene from scratch, I just convert the plants and the vase. but this concrete wall is getting me crazy!, as well the strange behavior on those converted materials.
Now we all are gathered …
About lighting. Is there anyone that can tell what kind of unit or measure that is being used for the emission, - and even better could anyone give me some equivalent value(s) to the real world.
As I understand the value is area based - in other words, it doesn’t matter wether it is placed on an 1x 1 cm object or or an 1 x 1 m object, the light has the same strength, right?
And as I understand it shouldn’t matter wether I’m using a corona light set to a rectangle of 1x1 m or if I make a material with emission set to the same value and put it on a plane in same size, right?
The tricky thing is, - again, as I understand- , if you use a corona light with an IES profile - and you then want to make a mesh of fx. a lightbulb to look glowing, as IES lights are measured outside of a given fixture, giving the total light distribution.
If you chose to let the IES light light the fixtures mesh, it would be wrong, as it would fx. light the shades inside with the light distribution from the total fixture. AND if you use a material to make the lit components glow, then it would not be right to, because this would distribute both the light from the IES light together with the emitting material - as I don’t see any setting for not letting the material emit light - just look like it does. Correct me if I’m wrong.
It’s for sure easier to put in a Corona light or material and let it mimic the fixtures light source (the bulb) and then let it distribute light inside and outside the fixture. It wouldn’t however “hold in court” in the documentation for a light distribution as you can’t be sure the various components in the fixture are modeled right, if they all are there and have the right material ect ect. That unfortunately is certified to be right in IES profiles.
You might say, - hey, we are only doing visualizations - yes, but it’s always good to know if we are doing all physically correct or not - especially if we are going to deal with things likephysical cameras ect. and am wondering why things are not looking like on photos anyway.
Still, I may stand corrected - and please do if I’m wrong.
What Rawalanche means by “stick to it” is that VFB+ works flawlessly with corona too,
just switch vfb type to default instead of corona’s built in ‘customWxWidgets’ and if you have vfb+ overriding the default max you’re back to your uses.
Everything work, render pass switch, even stamping whatever render’s parameters from Corona’s core.
!!! The only thing I could see improved is the corona’s settings ‘post production’ are not reflected when render is stopped : at render time changing the highlight compression would reflect in render view (Wx or VFB+), after pushing stop it’s not working anymore in VFB+ while it stills alter the image in the WxWidget. That is probably not much informations to exchange between Corona’s dev and VBF+ dev to make it fully integrated.
