V-Ray 8.29 [clay renderings]

“Creating ‘Clay’ Renderings”

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  • NOTE:  In the interest of making your life easer, you can view and download a Clay Rendering .visopt file here that will require little work on your part to get a nice quality clay rendering.  If you choose this method, you do not need to perform steps 3+ below and you can leave your sun on in the scene when rendering.
  • IMPORTANT: Before creating a clay rendering of your scene, use File>Save As… to save a new .3dm of your Rhino model just in case something goes wrong.
  1. In the V-Ray Options window, click on the “load” button. Select “Clay_Render.visopt” which you can download from this tutorial on the Digital Tools website.
  2. Open the global switches drawer and check the box for “Override materials.” Specify white as the override color.
  3. Uncheck the box for “lights” to turn off all lights in the scene except the default lighting.
    • Note: Turning off all lights will not make your drawing dark, but it will eliminate shadows cast by the sun which may or may not be desirable.
  4. Render your scene. Save the results.
  5. Now, in the VFB Channels drawer, specify “RGB Color”, “Alpha”, “Lighting”, “Render ID”, “Z Depth”, and “Background”.
  6. In the Global Switches drawer, check the box for Lights.
  7. Show the Sun (Turn on layer if not already on). Select your sun and click on the “Modify Sun” button under the Lighting section of the Properties window.
  8. Write down the Azimuth and the Alititude. Select “Cancel.” Turn off the sun layer.
  9. Create a line parallel to the y-axis (north). Use rotate3d to rotate your line by the Alititude value you wrote down above. (Your rotate3d axis of rotation should be the x-axis.)
  10. Now use rotate to rotate your line negatively by the Azimuth value you wrote down above. You will now use this line to create a basic directional light.
  11. Create a directional light with the end of light direction vector at the lower point and the start of light direction vector at the higher point of the line you created above. This will mimic the sun in direction and shadow, but will be less intense and not require the use of a Physical camera when rendering in V-Ray.
    • Note:  You should turn off any lights except the directional light (or adjust the physical camera to have a much higher shutter speed than suggested here).
  12. Return to your desired view and render the scene. This time the clay rendering will incldue basic shadows. Save your rendering.
    • Note: If your rendering is too light (with the directional light on), turn on the physical camera and set the shutter speed to ~15.
  13. If you have a section cut in your model, you will need to uncheck the "Override materials" checkbox (refer to step 2 above) and select all objects (that are not glass) that will be visible and assign them a clay  material.  (This material should be a default material with a white color.)