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Lighting and Rendering with mental ray in Maya

Creating render layers


From:

Lighting and Rendering with mental ray in Maya

with Eric Keller

Video: Creating render layers

There are a few different ways to create render layers in a Maya scene. I have my basic textured room with some simple lighting. I am going to create some render layers here. So the first thing I am going to do is I am going to open up the Channel Box, and you'll see that I have my three different layer types: Display, Render, and Animation. I am only concerned with Render at this point, so I'll click on this tab. You'll see under the tab that there is a defaultRenderlayer listed. This always exists in Maya scenes, and it contains everything in the scene, all the objects and geometry.
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  1. 3m 46s
    1. Welcome
      1m 32s
    2. Using the exercise files
      2m 14s
  2. 19m 8s
    1. What is a CG light?
      1m 22s
    2. Types of CG lights
      10m 55s
    3. Direct lighting
      4m 48s
    4. Indirect lighting
      2m 3s
  3. 53m 20s
    1. Decay rate
      6m 30s
    2. Previewing lighting and shadows
      2m 37s
    3. Creating depth map shadows
      1m 57s
    4. Troubleshooting depth map shadows
      2m 38s
    5. Shadow map overrides
      5m 30s
    6. Using the shadow map camera
      5m 31s
    7. Saving and reusing shadow maps
      2m 48s
    8. Creating raytraced shadows
      1m 56s
    9. Adding softness to raytraced shadows
      3m 42s
    10. Creating area light shadows
      5m 11s
    11. Sample: mental ray area light
      4m 23s
    12. Setting area light visibility
      8m 7s
    13. Creating soft shadows with spot lights
      2m 30s
  4. 43m 35s
    1. Setting global illumination for interiors
      2m 33s
    2. Tuning global illumination
      5m 56s
    3. Global illumination photons
      1m 12s
    4. Activating caustic light effects
      3m 28s
    5. Tuning caustic settings
      3m 35s
    6. Setting caustic light effects on metal
      2m 35s
    7. Using final gathering for indirect lighting
      2m 9s
    8. Tuning final gathering
      4m 2s
    9. Reusing final gathering maps
      3m 21s
    10. Adding light with shaders
      5m 27s
    11. Creating final gathering maps for animation
      4m 26s
    12. Combining final gathering with global illumination
      4m 51s
  5. 1h 2m
    1. Activating the Physical Sun and Sky network
      2m 33s
    2. Tuning the Physical Sun and Sky settings
      7m 18s
    3. Applying physical light shaders
      8m 54s
    4. Applying image-based lighting
      8m 57s
    5. Tone mapping
      6m 23s
    6. Applying portal light shaders
      7m 45s
    7. Creating light beams with participating media
      10m 9s
    8. Adding depth of field with the Bokeh lens shader
      10m 39s
  6. 48m 21s
    1. Introducing render layers
      6m 13s
    2. Creating render layers
      4m 28s
    3. Splitting a scene into render layers
      15m 36s
    4. Applying render layer presets
      7m 47s
    5. Setting render layer overrides
      7m 7s
    6. Creating render layer composites
      3m 52s
    7. Organizing renders with tokens
      3m 18s
  7. 42m 24s
    1. Introducing render passes
      2m 56s
    2. Comparing render passes and render layers
      6m 44s
    3. Editing render passes
      10m 41s
    4. Using appropriate materials
      5m 51s
    5. Batch-rendering passes
      5m 56s
    6. Compositing in After Effects
      6m 41s
    7. Rendering the EXR image format
      3m 35s
  8. 23m 3s
    1. Anti-Aliasing Quality
      6m 44s
    2. Setting color profiles
      2m 53s
    3. Diagnosing raytracing
      5m 7s
    4. Adjusting motion blur
      6m 57s
    5. Finding mental ray help
      1m 22s
  9. 21s
    1. Goodbye
      21s

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Lighting and Rendering with mental ray in Maya
4h 56m Intermediate Jul 22, 2010

Viewers: in countries Watching now:

Lighting and Rendering with mental ray in Maya with Eric Keller shows how to master practical mental ray techniques for rendering models created in Maya. This course walks through the most efficient and innovative mental ray techniques, including direct versus indirect lighting methods, creating different types of shadows, using the new ShadowMap camera, and reusing shadow and final gathering maps. A chapter on optimizing render times and enhancing render quality is also included. Exercise files are included with the course.

Topics include:
  • Understanding computer-generated lighting
  • Creating depth map and ray traced shadows
  • Softening and shaping shadows
  • Working with global illumination
  • Lighting with the caustic settings
  • Applying physical and portal shaders
  • Adding depth of field with the Bokeh shader
  • Splitting a scene into render layers
  • Comparing render passes and render layers
Subjects:
3D + Animation Rendering Photography Lighting
Software:
Maya
Author:
Eric Keller

Creating render layers

There are a few different ways to create render layers in a Maya scene. I have my basic textured room with some simple lighting. I am going to create some render layers here. So the first thing I am going to do is I am going to open up the Channel Box, and you'll see that I have my three different layer types: Display, Render, and Animation. I am only concerned with Render at this point, so I'll click on this tab. You'll see under the tab that there is a defaultRenderlayer listed. This always exists in Maya scenes, and it contains everything in the scene, all the objects and geometry.

So if I want to create a new Render layer, I can go Layers > Create Empty Layer, and I'll see layer1 appear. Maybe I can name this something like litRoom. If I want to delete it, I could just right-click over it and do Delete. It won't allow me to delete because I have the layer selected. So I'll select this defaultlayer, and now right-click, and go Delete, and now the layer is gone. So I'll do Ctrl+Z to bring that layer back. If I want to add something to this layer, for instance if I select the roomGeometry, I can right-click over this and do Add Selected Objects, and that will add all of the room geometry to the layer.

Likewise, I can right-click and remove selected objects to take it out of the litRoom layer. Another thing I can do is select the roomGeometry, or actually I'll expand this, and I'll just select the firePlaceGroup. And I'll go Layers > Create Layer from Selected, and this will make a new layer. And when I select on it, you'll see there is the firePlaceGroup. And notice I selected the firePlaceGroup, and I created a new layer. Let's name this very quickly, just to get organized. Since I added the group to this layer, if I expand the group, and let's say selected on firePlace, and then try and remove this, it won't remove.

The reason is is because I added the group, so everything in the group is added to this layer. For example, if I drag this down a little bit, you can see, the firePlaceGroup selected, if I scroll down, I can see under Inputs, it is firePlace1. That's the name of this layer. If I select this Group and go Remove Selected Objects, you can see that now that disappears from the Input's List. Same thing happens if, say, I am in the Outliner, and I expand this, under Display, I have Shapes checked, so I can see both Shape Nodes and Transform Nodes, so when I expand a piece of geometry, for instance, the firePlace, I could see the Shape Node here.

So for instance, if I select this and I add this to the firePlace render layer, by right-clicking and doing Add Selected Objects, it's going to add this. So if I selected the firePlace Transform node in the Outliner and try and remove that, again, it won't allow me to remove this, and that's because I have added the Shape node instead of the Transform node. So this might cause you a little bit of frustration. So if you find that you're not able to remove something from a layer, check and see whether or not you have added the Shape node, as opposed to the Transform node.

So in this case, I'll just select the Shape node again and do Remove Selected Objects, and now it's gone. And I can delete this layer just by going Delete Selected layers. Oops! Remember, once again, I can't delete it if it's selected in the Layer Editor, so I'll just go Delete. Another way that I can add objects to a render layer is I'll go to the Window > Relationship Editors > Render Layers, and I can see my render layers here. If I select defaultRenderlayer1, you'll see that everything is selected.

If I go to litRoom, nothing is selected. Now if I select something like the roomGeometry, it suddenly appears, because it's been added to the litRoom. If I deselect it, it disappears. It's been removed from that room. Likewise, I can expand the Group and start to add specific objects, just by clicking on them over here and removing them, just by clicking on them again. So I'll add this.

That's the basics of using the Render Layer Editor, to create render layers and add and remove objects from the layers.

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