Rhinoceros 5.17 [directional light]

“Creating and using a directional light”

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  1. In a most basic form, directional lights mimic the suns rays in that they cast parallel rays of light toward your model. While this is a preliminary (and rudimentary) lighting scheme, it can be good for getting quick rendering “sketches” out from the computer.
  2. To set up a directional light, click on the directional light tool, Select Render>Create Directional Light or type “DirectionalLight” into the command line. [Premium Content - Login] [Membership Options]
  3. Now, select the point on the model where you want the light vector to end. (Note: This does not mean the light will end at this point, but rather that the light will flow in a direction toward this point.)
  4. Next, select the point where you want the directional light to begin. This can be tricky as it can be difficult to place the directional light exactly where you would like it. Continue on with step 5 if you want to place the directional light in a more precise location.
  5. Instead of placing the directional light in the perspective view, try placing the light only in the top view. While this will cause the light rays to be flat initially, you can always adjust the height of the sun later (step 7).
  6. After your directional light has been placed in the top view, switch to the right or front views and Select Edit>Control Points> Control Points On or type “pointsOn” in the command line.
  7. When asked to select objects for control point display, pick the directional light source. You will notice a control point appear in the middle of the directional light.
  8. Use the move command (preferable to the drag command) to adjust the height of the control point.
  9. Note: You could use this type of directional light to mimic the sun at a given time of day in a given location if you know the azimuth and altitude of the sun on a given day. To find out the azimuth and altitude on a particular site on a particular day and time, visit: http://aa.usno.navy.mil/data/docs/AltAz.php  You might also like to view V-Ray 8.29 [clay renderings] and look at steps 8-11.


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