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Introduction to image sampling

From: V-Ray 2.0 for Maya Essential Training

Video: Introduction to image sampling

In Chapter 2 of our course we covered a somewhat brief outline of Image Sampling in theory. What we need to do now is move on to examining V-Ray's Image Sampling Engine themselves and of course take a look at the controls and parameters that go with them. To do this we've set up for ourselves a custom made scene that really presents some difficulties, some challenges for our Image Sampling Engines. We're going to throw the scene at them and see how they handle this test. In fact, just to show you what we have set up in our scene, let's pull up Maya's Render View window, and if we want to come to File>Open, and you can follow these steps because you have these images provides in your Exercise files folder.

Introduction to image sampling

In Chapter 2 of our course we covered a somewhat brief outline of Image Sampling in theory. What we need to do now is move on to examining V-Ray's Image Sampling Engine themselves and of course take a look at the controls and parameters that go with them. To do this we've set up for ourselves a custom made scene that really presents some difficulties, some challenges for our Image Sampling Engines. We're going to throw the scene at them and see how they handle this test. In fact, just to show you what we have set up in our scene, let's pull up Maya's Render View window, and if we want to come to File>Open, and you can follow these steps because you have these images provides in your Exercise files folder.

So make sure you are in your Exercise files, come to assets>Ch06, and we just want to load this Main_Cam.bmp file. And if we open that and if I just middle-mouse scroll out a little bit and then hold Alt and Pan, you can see we have a number of different elements in the scene. For instance, we have materials that for the most part have been set up with blurry or noisy reflections on them. So the noise will have to be cleaned up by our Image Sampling Engines. We have number of objects that have straight lines associated with the materials, that can be something that is challenging to our Image Samplers.

We also have some noisy patterns; you look at the patterning, the texture that is found in the diffused properties of our cabinet here. You can see we have lots and lots of noise and detail in our countertop and our vase material. So lots of expects of the materials that the Image Samplers will have to work on. In terms of lighting in the scene, we have a V-Ray dome light, of course that gives a 180? of direct light. But we have left our subdivisions, our sampling subdivisions set at the default of 8. So again, the Image Samplers will have to work to clean up any shadow information coming from our lights.

Global Illumination is also enabled in the scene. If we come to the Render Settings window, let's come into the Indirect Illumination tab, you can see the Systems are enabled. If we come down, you can see our Irradiance Map, Primary Bounce Engine is set to Low setting. If we come down to our Light cache settings, you can see we have very low Subdivisions there of 250. That means we can get a lot of noise, blotchiness in our scene and, again, the Image Samplers will have to work to resolve any of that. If we come right up to the top of our roll out, you can see we also have Ambient Occlusion.

Again, this is a noisy, secondary Ray effect giving those occlusion shadows. Add to that the fact that if we come to the V-Ray tab, we have no Antialiasing filters enabled, so there's no averaging or smoothing taking place off our sampling. Well, you can see that the scene would present some difficulties for our Image Samplers. So with the clear view of just how our test scene has been set up then, let's push on to our next video and take a look first of all at working with V-Ray's Fixed Rate Image Sampling Engine.

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This video is part of

Image for V-Ray 2.0 for Maya Essential Training
V-Ray 2.0 for Maya Essential Training

54 video lessons · 2210 viewers

Brian Bradley
Author

 
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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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