Orthographic projection vray tutorial

12 May, 2010 renderstuff (Staff Author)
 

Probably, anyone who deals with visualization, especially of architecture, have faced the need of creating an image without perspective distortion. In particular, it is the rendering of the orthogonal projection of the facade of a building or a straight interior elevations.
In most cases, the most common question on this theme is: "How to render a facade without the perspective using VRayPhysicalCamera?" The answer is quite simple - in no way with completely no perspective with VRayPhysicalCamera :)

The difference between perspective view and othographic projection image Camera targeting in the Left viewport image

In fact, the perspective is a distortion of dimensions and shapes of objects in their visual observation. It is specific not only to any camera lenses, but to the human eye also. Speaking in the aspect of traditional photography, perception of the perspective distortions of the human eye, for example, close to those in the so-called normal lens. The strongest perspective distortions are in the wide-angle lenses with small focal length. And in contrast, less perspective distortion observed in telephoto lenses with long focal length.

Just these very distortions are imitated by the 3d program's cameras.

It is easy to guess that to get rid of perspective, you simply need to increase the focal length, simulating the telephoto lens and reducing the perspective distortions to a minimum. However, as in real photography, the changing of the focal length also changes the camera's zoom and angle of view. This makes a need to carry the camera to a considerable distance from the subject, so that the shot hit the same part of the scene, as in the shot with a smaller focal length.

The focal length setting is responsible for a VRayPhysicalCamera focal length. To achieve results that are very close to the orthogonal projection, it is necessary to increase this parameter. Typically 3000-5000 mm would be enough to significantly minimize perspective distortion. Also you should move the camera back at a considerable distance for all objects to be completely in the shot.

In any case, it will be only the relative visual similarity with the orthogonal projection, while in fact not being it:

Enabling Orthographic Projection option the standard 3ds max camera image

The real orthographic projection can be obtained using standard 3ds max camera. To do this, just replace VRayPhysicalCamera with standard and activate the appropriate function in it.

Take a look at the bike picture. At the first visualization it looks pretty standard, like any forward-looking photo, but at the second picture it looks more like a color drawing than a photo. This is especially evident at the handlebar. In the first case the both left and right red handles are clearly distinguishable, which go into perspective and distort, while in the second case even the left hand is virtually invisible. It is visible strictly on the side only and has no perspective distortion.

If your scene is initially configured for visualization with VRayPhysicalCamera, you can simply change it to standard 3ds Max camera using a few basic operations. You can learn how to do it from the Switching from VRayPhysicalCamera to standard tutorial.

The Orthographic Projection option is responsible for the reconfiguration of the standard camera from perspective into orthogonal. It is located in the camera settings Parameters rollout. Simply set the checkbox near Orthographic Projection and the camera will be orthogonal without any even minimal perspective distortion.

Whether to use VRayPhysicalCamera with intense settings or an present feature of a standard 3ds Max camera is rather a matter of taste than of a principle correctness. The desired result can be achieved in both ways. Pick the one that is comfortable and easier. We hope that this lesson has helped to answer the frequently asked question about how to do render without perspective distortion in the V-Ray.

Have a beautiful and precise ortho-renderings! :)

Questions and suggestions regarding this tutorial please leave in comments.



15 May, 2010 Dima3
15 May, 2010 # Re: Orthographic projection vray tutorial
Thank you!


23 May, 2010 Sad
23 May, 2010 # Re: Orthographic projection vray tutorial
really helpful. thanks man!

2 Jun, 2010 Rossamahaar
2 Jun, 2010 # Re: Orthographic projection vray tutorial
Thank you very much!


6 Jun, 2010 arq
6 Jun, 2010 # Re: Orthographic projection vray tutorial
I'm working on an architecture project, and needed the orthogonal projection of the building, I am designing the buildings with sketchup with the help of v-ray for the renders, I appreciate if you can explain how I do in r-ray to obtain the projections of the orthogonal to the building.

6 Jun, 2010 RenderStuff (Staff Author)
6 Jun, 2010 # Re: Orthographic projection vray tutorial
Hi arq! We do not use the Google SketchUp in our work, but it is for sure that the conceptions for using 3dsmax's and sketchup's V-Ray are similar. All you need is to correctly position the camera exactly perpendicular to the facade. Then to minimize perspective distortion. This is done by enabling the Override Focal Length option and setting it to 3000-5000 millimeters. This way you imitate the extrastrong telescopic effect and get the minimum of the perspective distortions. After that move the out (back) camera so the all facade be in the frame and render it. Also you can check if there is a possibility of using the default camera with V-Ray in SketchUp in ortho mode.

8 Jun, 2010 San
8 Jun, 2010 # Re: Orthographic projection vray tutorial
zmetil than the less professional approach any unnecessary bullshit need to nibble rezalty. it is rather a hindrance. physicist himself does not use 🙂


9 Jun, 2010 3Dman
9 Jun, 2010 # Re: Orthographic projection vray tutorial
You guys are miracle-workers! Thnx for your advices. They very helpful to me.

31 Aug, 2010 Yellesar
31 Aug, 2010 # Re: Orthographic projection vray tutorial
Thank you🙂


25 Oct, 2010 Marina
25 Oct, 2010 # Re: Orthographic projection vray tutorial
and thank you from me!


25 Oct, 2010 Marina
25 Oct, 2010 # Re: Orthographic projection vray tutorial
By the way, solving the question before reading this lesson when I nat. chamber pressed the ortho projection, reduce kolormeping and received the same picture as in the process. Does it make sense to change the camera?


6 Jun, 2010 RenderStuff (Staff Author)
25 Oct, 2010 # Re: Orthographic projection vray tutorial
Hi, Marina. It is, rather, a matter of personal convenience. If you do not need to shoot it from the camera, then, of course, possible and without it, just to render one of the orthogonal projections. However, with the camera fixed to the desired position, it is more convenient to deal with than one of the orthogonal projections, but not necessarily😉


29 Oct, 2010 fluid
29 Oct, 2010 # Re: Orthographic projection vray tutorial
great , it work for me. thank u guys. thanks again

30 Jan, 2011 cale
30 Jan, 2011 # Re: Orthographic projection vray tutorial
any idea how one could change the camera from perspective to orthographic over time? I have an animation where I want to pull the camera up from an object to show it from the top, but in orthographic.

6 Jun, 2010 RenderStuff (Staff Author)
30 Jan, 2011 # Re: Orthographic projection vray tutorial
Hello cale,

Generally, the Orthographic Projection option is not animatable. However, you can decrease the camera's FOV value to the unity. Also, move it away from the object on the enough distance, so the object can fully be seen in the frame. Actually, this is the trick described in the tutorial on the VRayPhysicalCamera using.

As an option, you may create additional camera with Orthographic Projection enabled, and switch to it on the desired frame of the animation.

The last and the simplest, you can make your animation as before, but saving it to the rester image files sequence. After this, separately render the ortho-frames and paste them by the desired numeration to the final sequence, shifting the left frames.

If you wish to have the smooth animation of the gradual changing from the perspective to the ortho, the first option will be the most suitable 😉

28 Feb, 2011 Masha
28 Feb, 2011 # Re: Orthographic projection vray tutorial
Thank you for the lesson. And another question, it was not on, however it possible to save Max from the orthogonal projections in DWG format?


6 Jun, 2010 RenderStuff (Staff Author)
2 Mar, 2011 # Re: Orthographic projection vray tutorial
Masha, hi. Yes, the question is a bit beyond the scope of the splint, but we can make it out in the discussion of general questions on the 3d graphics . Come back and ask any question you are interested in, starting new discussions . We will together around will understand😉


21 Mar, 2011 Big Chris
21 Mar, 2011 # Re: Orthographic projection vray tutorial
Grab hold of Vray 2 and use a normal max camera with VRay exposure settings.. then you can have whatever angle you want !!!!

6 Jun, 2010 RenderStuff (Staff Author)
21 Mar, 2011 # Re: Orthographic projection vray tutorial
Yeah Big Chris, you're right, that is already possible with V-Ray 2.0 in V-Ray Exposure Control rollout of Environment tab in Environment and Effects window 🙂

5 Jun, 2011 dartanyan
5 Jun, 2011 # Re: Orthographic projection vray tutorial
Thank you so much! The world's best obyasnyatel🙂 The whole site is very like! You write a book author)


6 Jun, 2010 RenderStuff (Staff Author)
5 Jun, 2011 # Re: Orthographic projection vray tutorial
Hello, dartanyan. RanderStuff the same book on the theme of CG, not paper, and Online😁


11 Oct, 2011 Mihail
11 Oct, 2011 # Re: Orthographic projection vray tutorial
Could you tell. Why orthographic projection there is no reflection in the glass. On the environment appointed Khdr card, in the long term, it can be seen, and in ortografii no ...


11 Oct, 2011 Anton (Staff Author)
11 Oct, 2011 # Re: Orthographic projection vray tutorial
Hello! Orthographic projection has no prospects. That is just a front view of the current scene in the camera. When you, for example, visualizing facade normal camera perspective, then you do it, as a rule, from the bottom, as it were, from the human growth. Here you can see the bottom of the foundation of the building is almost frontally, but the top of the building begins to lean on you and narrow. That is "out" in the future. That is why you see the glass on the facade of the building is not frontally, but at an angle. It is from this angle they capture the "sky", which is reflected in them. In the case of orthographic projection, you can not see nothing at an angle of perspective, everything is clear frontally. "Angle of incidence equals the angle of reflection." Can not be on a strictly vertical (to the camera) surface reflected the fact that strictly horizontally on it. In orthographic projection, on a flat vertical surface, which are the windows, it can be reflected only what is strictly in front of them, but it does not from the side or from above 🙂


9 Apr, 2012 ziczod
9 Apr, 2012 # Re: Orthographic projection vray tutorial
Hello, and how to be in the interior? When we remove the prospect of seeing the wall of the room in front of him. regulated scope did not help.


9 Apr, 2012 Maks (Staff Author)
9 Apr, 2012 # Re: Orthographic projection vray tutorial
ziczod, see the discussion about the use of Clipping planes in the Max 3ds .


22 May, 2012 shir
22 May, 2012 # Re: Orthographic projection vray tutorial
thank you for help!

14 Jul, 2012 pun
14 Jul, 2012 # Re: Orthographic projection vray tutorial
go to tools, vray light lister

all vray light multiplier divided by 30.

for example, 30 change to 1

600 change to 20

and also the multiplier for vray lighting material.

here u go just render the elvation and plan

21 Feb, 2015 hai
21 Feb, 2015 # Re: Orthographic projection vray tutorial
when using normal standard camera with vray exposure settings
hdri image background does not appear in elevation views
is this not possible?

11 Oct, 2011 Anton (Staff Author)
21 Feb, 2015 # Re: Orthographic projection vray tutorial
Do you mean that Environment map («8» key on keyboard) not visible in the viewport? If so, go to «Views -> View port background» and select the «Environment background» option 😉

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