Chaos Corona Forum
General Category => Gallery => Work in Progress/Tests => Topic started by: Kaihes on 2014-11-11, 14:51:24
-
I want to share the first results of my upcoming AMG GT series.
The backplates and HDRI's were shot in Dortmund/Germany. The AMG GT was modeled by Humster3d.
Feel free to criticize ;-)
-
Perspective of car in the backplates doesn't really work in most of the pictures. And neither does the lighting. The car looks quite fake and style does not get along with stylization of the backplates.
-
Ok I have to admit that I'm new to the whole "CGI-world" . Could you explain it in a a little more detail? The car was positioned with a reference cube (except for the first image), but perhaps I made a mistake....
-
It just looks generally weird, as if it was tilted to the right. And to match the car with backplate better, i would first try to take some raw photographic backplate, without any retouches, integrate the car into it and render them together, and then stylize and retouch the entire image with a car. If you place car into already stylized backplate, it's a lot more challenging to do right.
-
Agree with Rawalanche on perspective. And i just can't stand that "Dragan" style. It's so overused...
-
It just looks generally weird, as if it was tilted to the right. And to match the car with backplate better, i would first try to take some raw photographic backplate, without any retouches, integrate the car into it and render them together, and then stylize and retouch the entire image with a car. If you place car into already stylized backplate, it's a lot more challenging to do right.
Mh okay, but this is basically what I did. The first image is the "raw" image (ok some highlight recovery and the best people) with the car integrated. And then retouch everything together. But I will have a look at the perspective. ;-)
-
Agree with Rawalanche on perspective. And i just can't stand that "Dragan" style. It's so overused...
"Dragan" style?
-
Don't know, maybe it has different name novadays, but it's basically the same - boosted midtone contrast and saturation over the top. Sadly, it's pretty much standart in automotive photography :/
-
Okay, thank you guys ;-)
I will show you the hopefully fixed version ;-)
-
Ok, I changed the colour, the red seems easier to handle, the position of the car, and the HDRI.
Does the postion still looks weird?
The bright spots of the sun on the backplate needs to be removed. I will add some reflections on the most important lines of the car as well.
-
Nope, still not working. Reflections are weirdly distorted, so the model itself could be the problem. Start with some simple integration, into static backplate, no motion blur. First try to master that before jumping into more complex scenarios. Also make sure your model is good. If there is some funky topology, no matter how hard you try, it will always look weird, because car paints mostly reflect sharply, and reveal crumpled surfaces ;)
-
Thank you Rawalanche :-)
So I changed the HDRI and the Backplate with the static ones. I added some teapots as well, so that it might be easier to find the most significant problems.
The model is from humster3d, so I guess it should be fine....
-
Car chasis seems to be full of distortions, so it's not a good model i am afraid. Nor is the backplate, because it's super difficult to compose objects that are partially in shadow, and partially in light. The case you have here is really one of the most difficult. To make successful image you need a good starting conditions. That means good car model, and good backplate :)
-
Thanks Rawalanche for your patience ;-)
I'm sure I can fix the backplate...I have some exposures without sun, so I can fix the sunny spots.
Is it possible to fix the distortion problem? To be honest I don't know if I understand that problem. I always thought distortions are a natural effect, if the surface isn't completly flat. But the car body has curves etc., so that distortions should be visible or am I wrong?
-
Like this one. It should look like entire chasis is made of one piece which has been cut apart. Here it looks like two pieces that bend inwards into the area of the cut. So you can see reflection doing something looking like two bubbles next to each other. This is most common problem of the low quality models.
(https://forum.corona-renderer.com/index.php?action=dlattach;topic=5872.0;attach=23833)
As for backplates, if you done them yourself, just make yourself (or get yourself) one that is either completely in sun or sky light, or completely in shadow, but ground area on which car will be placed should have no areas where shadows and light meet in contrast, like this one. These situations are solvable, but really difficult, so if you are just learning the process, then pick yourself easier scenario first :)
-
Like this one. It should look like entire chasis is made of one piece which has been cut apart. Here it looks like two pieces that bend inwards into the area of the cut. So you can see reflection doing something looking like two bubbles next to each other. This is most common problem of the low quality models.
(https://forum.corona-renderer.com/index.php?action=dlattach;topic=5872.0;attach=23833)
Ah okay, I see :-) . I will talk to humster3d, perhaps they can fix it....
As for backplates, if you done them yourself, just make yourself (or get yourself) one that is either completely in sun or sky light, or completely in shadow, but ground area on which car will be placed should have no areas where shadows and light meet in contrast, like this one. These situations are solvable, but really difficult, so if you are just learning the process, then pick yourself easier scenario first :)
But you talk about the backplate and not the HDRI correct? I thought the only problem were the sunny spots in the car shadow, which has to be removed. Or is there anything else to consider?
-
Backplate. I can not really imagine how could you remove them while keeping backplate looking pretty :)
-
I have some exposures without the sun (it had been covered by some clouds), so that I can remove the bright spots, as soon as I'm sure where the car stands in the final image.
While I'm waiting for the repsonse of humster3d, does someone know if there is a tutorial for bringing the edges of the body parts on the same level? It should fix the distortion problem.
-
So I got a new model from humster3d. The side of the car looks better, but still not perfect. The complex design of the body seems hard to handle.
What do you guys think of the updated model?
-
Still not perfect, but better. I suggest you try simple studio setup to see how car contours really look.
-
Not sure if the materials are final or not at this point but I've attached a markup with some material adjustment suggestions FWIW.
-
For me everything seems greyish, washed out and plastic-looking. Maybe you should work on your carpaint shader and darken elements that are gray.
-
Thank you guys, but the materials, the backplate, the position of the car and the HDRI are absolutely not final. I will start with them, as soon as the geometrie of the body looks good. ;-)
-
So this is the updated rendering, without photoshop. I guess I have to leave the model as it is and avoid humster3d in the future. :-(
But thank you guys for all your support. ;-)
-
So this is the updated rendering, without photoshop. I guess I have to leave the model as it is and avoid humster3d in the future. :-(
But thank you guys for all your support. ;-)
Can you point out what you specifically don't like in this model? I can't see nothing wrong in it, at least nothing that could stop you from making spectacular renderings.
-
Well the main problem is the side door which still shows some weird distortions. (See the image before)
Furthermore they needed about a week to fix the main problems, but they forgot the distortions at the trunk, which I had to fix myself.
Unfortunately I don't have the skills to solve the weird distortions at the door.
But yes perhaps those problems are based on the complexity of the car itself, so blaming humster3d wasn't correct. I simply don't have enough experience to give a precise assessment.
Do you have some other tips, which could help me, to improve the renderings? :-)
-
Well the main problem is the side door which still shows some weird distortions. (See the image before)
Furthermore they needed about a week to fix the main problems, but they forgot the distortions at the trunk, which I had to fix myself.
Unfortunately I don't have the skills to solve the weird distortions at the door.
But yes perhaps those problems are based on the complexity of the car itself, so blaming humster3d wasn't correct. I simply don't have enough experience to give a precise assessment.
Do you have some other tips, which could help me, to improve the renderings? :-)
Don't expect 100% accuracy on a 100$ model.
I'm working for Mackevision at Stuttgart, and we do a lot for Mercedes. I'm responsible for the CGi images for the brochure and the the configurator online (attachement). I worked about 1 month with the AMG GT and know the car from every angle (CAD files). The model here is just so inaccurate as we are used to from 100$ models. Most people can't model cars like the AMG GT. Or, did you ever asked yourself why you can't see Porsche models that much? Because it's a rounded design. To get those shapes right is a masterpiece only by using blueprints for example. Therefore you will find more people which is doing a Lamborghini for example, because with hardsurface modelling you mostly dont care about curvatures or smooth curves. If you are good at managing polyflows than you already got half the battle.
But this says nothing about the modeller skills (in this case humster3d). Nobody know the ambitions and amount of time he put into this model. So if you want to model a car within 5 days, than this result is solid.
So this is the updated rendering, without photoshop. I guess I have to leave the model as it is and avoid humster3d in the future. :-(
But thank you guys for all your support. ;-)
Can you point out what you specifically don't like in this model? I can't see nothing wrong in it, at least nothing that could stop you from making spectacular renderings.
have to agree here. The model is good enough, to do great renderings for sure.