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Activating the Physical Sun and Sky network

From: Lighting and Rendering with mental ray in Maya

Video: Activating the Physical Sun and Sky network

mental ray has a special shading network that is designed to make simulating outdoor lighting very easy. This is known as the Physical Sun and Sky Shading network. I'm going to demonstrate how to activate this feature. So, in this scene, I just have a simple model of a Frankenstein's monster toy, and what I'm going to do is I'm going to turn on the Physical Sun and Sky, so that it looks like this is rendered outside. I need to go into the Render Settings and switch to the Indirect Lighting tab, and under Environment, at the very top, there's a button here for Physical Sun and Sky.

Activating the Physical Sun and Sky network

mental ray has a special shading network that is designed to make simulating outdoor lighting very easy. This is known as the Physical Sun and Sky Shading network. I'm going to demonstrate how to activate this feature. So, in this scene, I just have a simple model of a Frankenstein's monster toy, and what I'm going to do is I'm going to turn on the Physical Sun and Sky, so that it looks like this is rendered outside. I need to go into the Render Settings and switch to the Indirect Lighting tab, and under Environment, at the very top, there's a button here for Physical Sun and Sky.

So, I'm just going to press that button, and it will create the network. It's also going to automatically turn on Final Gathering. So, this is turned on automatically when you press that button. I'll close this. We have a new sunDirection light that's been added to the scene. So, I'm just going to pull this up, so we can see it a little bit better. I'm just going to go ahead and create a test render and see how it looks. This is what we get just by hitting that Render button. So we can see we have a nice little plastic toy here.

So, I'm going to save this. If I want to change essentially the look of the render so that it looks like a different time of day, the only thing I need to do - I don't need to change any of the settings - all I need to do is rotate the light. The closer that the Light icon becomes parallel to the ground, the later in the day or the earlier in the day, it will appear. So you can make it look like early morning or late afternoon. So, I just rotated that a little bit and do another render, and you can see now that we have the light coming from here, we have longer shadows.

You can see the Final Gathering is adding some blue color to the shadows. You also notice that in the background, we have a simulated blue sky, and you can even see the glare of the sun over here. Then there's also a horizon that's automatically added to the scene. If I position the light and rotate it so that it's pointing right at the camera, and do another render, you can see that we get something that looks little bit more evening, but you can also actually see a hazy disc that represents the sun.

So that is added to the render as well. After adding this to the scene, the next step would be to adjust the settings to get the kind of lighting that you'd like.

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Image for Lighting and Rendering with mental ray in Maya
Lighting and Rendering with mental ray in Maya

59 video lessons · 7945 viewers

Eric Keller
Author

 
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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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