Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Setting up for a depth-of-field effect

From: SketchUp Rendering Using V-Ray

Video: Setting up for a depth-of-field effect

When it comes to adding a photographic depth-of-field effect to our renders, there are a couple of options available to us whilst rendering with V-Ray in SketchUp. We could for instance render out a Z-Depth G-Buffer image that could be used in a post-production application such as Photoshop to add blur after the fact. But if for some reason we need physically accurate depth of field, then we will need to use to V-Ray Physical Camera and its built-in depth-of-field capabilities. When we are looking to create in-scene effects such as depth of field with the V-Ray Physical Camera, we really need to keep in mind the fact that many of the choices we make for our camera setup, such as the focal length of our lens, camera placement for composition, lighting, and exposure requirements, all of these will affect how we create and ultimately control depth of field in our scene.

Setting up for a depth-of-field effect

When it comes to adding a photographic depth-of-field effect to our renders, there are a couple of options available to us whilst rendering with V-Ray in SketchUp. We could for instance render out a Z-Depth G-Buffer image that could be used in a post-production application such as Photoshop to add blur after the fact. But if for some reason we need physically accurate depth of field, then we will need to use to V-Ray Physical Camera and its built-in depth-of-field capabilities. When we are looking to create in-scene effects such as depth of field with the V-Ray Physical Camera, we really need to keep in mind the fact that many of the choices we make for our camera setup, such as the focal length of our lens, camera placement for composition, lighting, and exposure requirements, all of these will affect how we create and ultimately control depth of field in our scene.

We also have a choice over the behavior of our V-Ray Physical Camera. It can be used exactly like a real camera in that depth of field is always a factor of the focal length, or we can override this behavior for a simpler setup and a more artistic, rather than realistic, approach to creating the depth-of-field effect. Because we do have this flexibility, we should note that any numeric values we work with in this video really are specific to the scene and the shot that we have composed.

You will need to adapt the values to work with the exposure of your scene, the focal length of your lens, and the type of depth of field you want in the shot. But perhaps one of the first things that we will need to decide is just what the point of focus is in our depth-of-field shot. In other words, what do we want in and what do we want to be out of focus? In our case we're going to work with our pool ornament as the in-focus part of the scene and we're going to create a subtle depth-of-field effect on our table. Of course we do need to go and enable depth field on our V-Ray Physical Camera, so let's come into the Options Editor, into the Camera rollout, and if we scroll down, you can see we have the depth-of-field controls and we can just switch that on.

A problem I have at the moment is that in the free version of SketchUp we actually don't have any easy way of measuring the distance from our camera in the scene to our point of focus, to our garden ornament. There are indeed free scripts that will allow us to measure the distance from our SketchUp camera to certain points in our scene. As we don't have any of those scripts installed though, we are going to be working with just the tools available with the default SketchUp and default V-Ray installs. Because that is the case, as well as turning on our depth-of-field effect, we also want to go and enable this Override Focal Distance control.

This will allow us to set a specific distance in our scene from the camera, at which our point of focus resides. What we can do now is engage in a little bit of educated guessing with the help of SketchUp's Tape Measure tool. The first thing I want to do is come and dismiss our Options dialog and I want to come over to SketchUp Zoom tool, because I want to reset my camera view to a 50 mm lens. This setting roughly approximates human vision, and it will allow us to make a rough estimate of where, behind this table, our camera is positioned.

So if I just left-mouse-click to select the Zoom tool and then just enter 50 mm on my keyboard and use the Enter or Return key, you can see we have now set a 50 mm focal length in our view. Now, as we say, we can roughly tell where, behind the table, our camera might be. Because we of course need to measure the distance from our pool ornament to the approximate position of our camera, we are going to use SketchUp's Tape Measure tool. First of all I want to come up to the Camera menu, come to Standard Views, and go to a Top view.

Then I just want to middle-mouse-scroll out and then grab the Hand tool and just pull everything into place, just so that we can use the Tape Measure tool very easily. If we go and grab that tool, we can take a measurement for ourselves. So, first click to approximate where our point of focus is in the scene. Then if I just use the left arrow key on my keyboard, I can constrain to the green axis, and we can take a rough estimate of where in the scene we think our camera is. So if we say something around about there, we have a measurement then of roughly just short of 48 feet, which is what I will round things up to.

To dismiss the Tape Measure tool, I am just going to press once on my spacebar. Now before I go and enter any values in our depth-of-field controls, I do just want to click on our depth-of-field camera tab here, just to reset our view. This of course takes us back to a 65 mm lens as well. Now with that set, I can go back into the Options Editor and we can work with our Override Focal Distance parameter. One thing we do need to keep in mind about this Override parameter is that it works in scene units, so we need to enter a value in inches into this field.

Do bear in mind that no matter what display unit we are currently using, SketchUp behind the scenes always works in inches, and this is the measurement that this particular parameter will always require. So, a quick use of the calculator will tell us that 48 feet is the equivalent of 576 inches. So now we have our point of focus set in the scene, but of course we don't have our depth-of-field effect. Just as with a real camera, we need to set our F Number, or F stop value, so that it will give us a depth of field effect in the scene.

In this instance, I am going to set a value of 2.2 in here. Of course, something we need to keep in mind is that with this Exposure option checked, our F Number is also handling exposure in the scene. For this reason then, we're going to need to compensate now for the change in brightness values by altering one of the other exposure parameters. As the ISO value doesn't really control any other effects on the V-Ray Physical Camera, generally speaking, this is the parameter that I choose to work with.

In this instance, we are going to set it all the way down to a value of 5. Now we should have a scene that is ready to render with a depth-of-field effect enabled, so let's dismiss our dialog and take another test render to see if that is the case. And our render reveals that it most definitely is the case. You can see we have a very nice subtle depth-of-field effect working on our table. Of course, if this is a little too subtle for us, we can increase the depth-of-field effect, if go back into our Physical Camera controls. We could lower our F Number; of course that would mean we would need to compensate by altering our Exposure controls once again.

There is another option for increasing the strength of our depth-of-field effect, and this is to work with the Override Focal Length option. This will allow us to override SketchUp's lens value and enter one of our own. Now remember, at this moment in time, we are working with a 65 mm lens in the SketchUp viewport, but we can alter that by changing this to something really strong, like 120 mm. Now of course, typically speaking, changing the focal length of our camera would completely change the framing of our shot.

But with our Override Focal Distance option enabled, this actually doesn't happen. We get the depth-of-field effect increased as if we had to 120 mm lens on our camera, but the framing of our shot will not alter. In fact, let's take a render and show you that that is indeed the case. Well, clearly, we have dramatically increased the strength of our depth-of-field effect, so much so that our table is becoming almost invisible in parts.

And you can also see that we have not changed the framing of our shot at all, which can be really, really handy in certain instances. Again, it is not physical behavior, but certainly it is an override that can help us out in many, many cases. So, depth of field with the V-Ray Physical Camera works exactly as per real-world cameras. The only difference really is that we have to deliberately enable the effect in our V-Ray Physical Camera to get it working, and we do have a couple of non-physical overrides that can help us out, that can give us some very fine artistic control over our depth- of-field effects.

Show transcript

This video is part of

Image for SketchUp Rendering Using V-Ray
SketchUp Rendering Using V-Ray

33 video lessons · 6193 viewers

Brian Bradley
Author

 
Expand all | Collapse all
  1. 4m 30s
    1. Welcome
      1m 14s
    2. What you should know before watching this course
      2m 33s
    3. Using the exercise files
      43s
  2. 7m 52s
    1. Installing V-Ray
      2m 27s
    2. Locating V-Ray tools and features
      5m 25s
  3. 39m 2s
    1. Creating natural daylight with the V-Ray Sun and Sky
      7m 41s
    2. Using the Omni Light
      7m 9s
    3. Exploring the Rectangle Light
      6m 2s
    4. Exploring the Spotlight
      4m 37s
    5. Exploring the IES light type
      5m 0s
    6. Setting up image-based lighting
      8m 33s
  4. 29m 40s
    1. Working with irradiance mapping
      12m 8s
    2. Creating a light cache solution
      6m 14s
    3. Using the DMC engine
      11m 18s
  5. 23m 11s
    1. Overview of the physical cameras
      5m 16s
    2. Understanding the Exposure controls
      6m 23s
    3. Handling perspective correction
      3m 4s
    4. Setting up for a depth-of-field effect
      8m 28s
  6. 44m 59s
    1. Introduction to V-Ray-specific materials
      9m 41s
    2. Creating diffuse surfaces
      9m 44s
    3. Creating reflective surfaces
      8m 2s
    4. Creating refractive surfaces
      9m 53s
    5. Creating translucent surfaces
      7m 39s
  7. 44m 8s
    1. Using fixed-rate sampling
      10m 21s
    2. Working with the Adaptive DMC engine
      11m 48s
    3. Controlling the Adaptive Subdivision sampler
      10m 15s
    4. Exploring subdivs and the DMC Sampler controls
      5m 52s
    5. Manipulating color mapping
      5m 52s
  8. 33m 39s
    1. Adding displacement to materials
      10m 48s
    2. Using caustic lighting effects
      7m 37s
    3. Creating occlusion effects
      8m 13s
    4. Creating a non-photorealistic render (NPR) with the Toon material
      7m 1s
  9. 1m 21s
    1. What's next?
      1m 21s

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Join now "Already a member? Log in

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed SketchUp Rendering Using V-Ray.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Your file was successfully uploaded.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.