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V-Ray 2.0 for Maya Essential Training
Illustration by Richard Downs

Depth of field: VRayPhysicalCamera


From:

V-Ray 2.0 for Maya Essential Training

with Brian Bradley

Video: Depth of field: VRayPhysicalCamera

When it comes to adding a photographic depth of field effect to our renders, there are a number of options available tools whilst rendering with V-Ray. In this video we will focus on using the V-Ray physical camera to create and control an in-rendered depth of field effect. Now when we're working to create these types of effects with the V-Ray physical camera, we really need to keep in mind the fact that choices we make, such as focal length for our lens, camera placement with regards to composition in the scene, the lighting and exposure settings that we use, all of these will affect how we create and control depth of field in our scene.
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  1. 4m 28s
    1. Welcome
      59s
    2. What you should know before watching this course
      51s
    3. Exercise files
      40s
    4. Workflow recommendation
      1m 58s
  2. 11m 32s
    1. Installing V-Ray
      4m 25s
    2. Setting up V-Ray
      3m 14s
    3. Locating V-Ray's tools and features
      3m 53s
  3. 24m 41s
    1. Image sampling explained
      3m 19s
    2. Understanding subdivs
      3m 49s
    3. Using the DMC Sampler
      6m 54s
    4. Overview of color mapping
      4m 45s
    5. Understanding the color-mapping modes
      5m 54s
  4. 27m 55s
    1. Dealing with lighting problems
      9m 26s
    2. Adding a spherical fill light
      8m 50s
    3. Creating a mesh light
      2m 43s
    4. Creating a skylight effect
      3m 18s
    5. Working with the dome light
      3m 38s
  5. 44m 25s
    1. Global illumination (GI) explained
      3m 55s
    2. Understanding primary and secondary bounces
      3m 34s
    3. How irradiance mapping works
      5m 30s
    4. Using irradiance mapping, part 1
      4m 35s
    5. Using irradiance mapping, part 2
      5m 44s
    6. How light cache works
      3m 48s
    7. Using light cache
      7m 58s
    8. Understanding brute force GI
      2m 18s
    9. Using brute force GI
      7m 3s
  6. 40m 3s
    1. Introduction to V-Ray-specific materials
      2m 22s
    2. Creating diffuse color
      8m 31s
    3. Making reflective materials
      5m 40s
    4. Blurring reflections
      8m 31s
    5. Making clear and colored glass
      8m 49s
    6. Creating a translucency effect
      6m 10s
  7. 24m 15s
    1. Introduction to image sampling
      2m 56s
    2. Using the Fixed-Rate sampler
      5m 57s
    3. How to use the Adaptive DMC sampler
      5m 21s
    4. Working with the Adaptive Subdivision sampler
      7m 7s
    5. Comparing image-sampling renders
      2m 54s
  8. 17m 23s
    1. The physical workflow explained
      2m 37s
    2. Working with VRaySun and VRaySky
      7m 39s
    3. Controlling the VRayPhysicalCamera
      7m 7s
  9. 45m 0s
    1. Depth of field: VRayPhysicalCamera
      5m 45s
    2. Depth of field: perspective viewport
      5m 49s
    3. Creating a motion blur effect
      9m 30s
    4. Generating caustic effects
      7m 51s
    5. Using VRayFur
      6m 2s
    6. Setting up render-time displacement effects
      10m 3s
  10. 34m 17s
    1. Render elements workflow
      6m 47s
    2. Preparing to composite
      2m 22s
    3. Compositing V-Ray elements
      7m 8s
    4. Putting extra elements to work
      6m 20s
    5. Post-lighting a scene
      11m 40s
  11. 11m 47s
    1. Overview of V-Ray RT
      5m 27s
    2. Demonstrating the RT workflow
      6m 20s
  12. 1m 8s
    1. What's next?
      1m 8s

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V-Ray 2.0 for Maya Essential Training
4h 46m Beginner Mar 08, 2012

Viewers: in countries Watching now:

This course introduces the features of the V-Ray 2.0 rendering engine and demonstrates how to extend the range of Maya with its state-of-the-art tools, such as irradiance mapping, fur and hair textures and shaders, and stereoscopic 3D rendering. The course covers critical concepts such as creating basic materials, image sampling, color mapping, subdivs, and lighting, as well as the Render Elements, RT, and physical rendering workflows in V-Ray. Exercise files are included with the course.

Topics include:
  • Installing and setting up V-Ray
  • Using the DMC Sampler
  • Understanding color mapping modes
  • Adding a spherical fill light
  • Working with the V-Ray Dome Light
  • Using irradiance mapping and the Light cache
  • Creating diffuse color
  • Making reflective materials
  • Creating translucency
  • Ensuring quality with image sampling
  • Controlling the V-Ray physical camera
  • Creating a motion blur effect
  • Compositing V-Ray elements
Subjects:
3D + Animation Rendering Textures Materials Visual Effects
Software:
V-Ray
Author:
Brian Bradley

Depth of field: VRayPhysicalCamera

When it comes to adding a photographic depth of field effect to our renders, there are a number of options available tools whilst rendering with V-Ray. In this video we will focus on using the V-Ray physical camera to create and control an in-rendered depth of field effect. Now when we're working to create these types of effects with the V-Ray physical camera, we really need to keep in mind the fact that choices we make, such as focal length for our lens, camera placement with regards to composition in the scene, the lighting and exposure settings that we use, all of these will affect how we create and control depth of field in our scene.

We just need you to make note of the fact that any numeric values we work with in this video are specific to this scene and this shot. If you were not working with the Exercise Files, you will need to adopt the values you work with to the scale of your scene and to the type of the depth of field effect you're wanting to create. Now the first thing we needed to make certain of is the fact that you are viewing the scene through your depth of field camera, so if we just come to the Panels menu and just make certain that we are looking through our V-Ray_DOF_Cam, that's going to be that place that we want to start with.

Of course we need to make certain that our camera is selected in the scene, so let's use the Select Camera icon and now we can get access to all of the parameters for this particular V-Ray physical camera. To turn depth of field on in the scene we need to come down to the bottom of our rollout, open up the Extra V-Ray Attributes rollout and come all the way down to the bottom of that. Now before we enable anything in our scene, we just want to pull up our Maya Render View, we are going to be working with the number of pre-rendered images, depth of field is a render intensive effect so we are just going to step you through the controls and show you the resulting renders.

Now with no effects currently enabled in the scene, this is the render that we would get. You can see there's no blurring, no depth of filed effect at all. To enable that we want to come to our Physical Camera Controls, put a check in the Enable Depth of Field option, and remember of course your Subdivisions values, your V-Ray Image Sampling values and your DMC Sampler Controls would all contribute to the final look of the depth of field effect. It is a noisy render effect, so these values will determine how smooth or indeed how grainy this particular effect ends up looking.

What I want to do here is just set a Subdivision value of 12; then we just need to come up in our Camera's Controls until we find our F-number values. This of course is as it is in a real world camera, this is the control mechanism for the depth of field effect in our scene. Lower F-stop values will of course give us a shallower, narrower depth of field, higher F-stop values will give us a much deeper depth of field making more and more of our scene or placing more and more of our scene in focus.

We do have to remember that as the F- stop value or the F-number value is the part of the exposure triangle in the V- Ray physical camera, we do need to make compensation if we drop our F-stop value down to get a shallower, more pronounced depth of field effect, then we will also be allowing more light into the virtual camera and so we would have to compensate with our other exposure controls. So with the system enabled I am using these particular settings, if we go and check our next render, you can see that we do indeed produce a very nice depth of field effect in the scene for ourselves.

You can see we have a reasonably shallow, narrow depth of field, our front row of pool balls here definitely out of focus as the time we get up to the yellow ball here, we are again out of focus. We only have this very narrow band here that actually is in focus at this moment in time. Now, this is because this is the area that our V-Ray Physical Camera has its target placed at. By default the V-Ray Physical Camera will use its target as the point of focus in the scene. We don't of course have to work with that particular option, if we want to change the point of focus in our scene without moving the camera's target we can come into the camera's controls and we can work with this Specify Focus option.

Now there is a little bit of gotcha that you need to be aware of, if we just minimize Render View, if you watch how the viewport framing works as we enabled this Specify Focus option, you can see we do change the composition of our scene; we change where our camera is looking. So you just need to be aware of that fact. Now I am just going to leave this option checked and in the Focus Distance, I am going to specify a value of 115 centimeters. We really now have shifted the point of focus in scene.

And again if we pull our Render View window, we would go from this depth of field effect to this one, as you see, we have really shifted the point of focus off the table. We can perhaps notice that we have increased the depth of our effect for getting a much wider depth of field effect in this instance as we use this Specify Focus value that is often times something that will happen so if we wanted to create a lot shallower depth of field effect of this end of the table, we would have to again work with our F-stop parameter or a F-Number value.

So depth of field with V-Ray Physical Camera is easy to create. It works exactly as per real world cameras, the only difference being of course that we actually have to deliberately enable this particular effect in the V-Ray Physical Cameras controls. What though if we were rendering with a standard Maya camera? Now that could be one of the default perspective cameras or it could be a camera we have added into the scene. Well what we are going to move on to now is taking a look at creating a depth of field effects in V-Ray when rendering the scene from one of those camera types.

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