8

Radiosity Controls 61
2.
Choose Tools > Measure Distance to measure
some object in the scene for which you know
the size; for example, a door or window. The
distance displays in the Co ordinate Display of
the st atus bar.
3. Choose Customize > Units Setup and adjust
the Scene Unit Scale.
Forexample,ifyourobjectmeasures35scene
units long, and your model uses US Standard
measurement, then you would enter 1 for the
scale, and choose Inches from the drop-down
list. This would give you an object 35 inches
long.
If your object measures 90 scene units long,
and your model uses Metric measurement,
then you would enter 1 for the scale, and selec t
Centimeters from the drop-down list. This
would give you an object 90 centimeters long.
Ex a m pl e: To pr ocess ra d io si t y wi t h phot omet r i c
lighting:
1.
Use a scene that has geometry set to the correct
scale. For more information, see
To s e t u n its
correctly (page 3–60)
.
For example, if the ceiling is 96 scene units high
inthemodel,makesuretheunitsaresettoUS
Standard (inches) and not Metric.
2. OntheCreatepanel,clickLights.
3. Choose Photometr ic from the drop-down list.
(The default is Standard.)
4. IntheObjectTyperollout,clickTargetPoint.
5. Drag in a viewport. The initial point of the
drag is the location of the light, and the point
whereyoureleasethemouseisthelocationof
the target.
The light is now part of the scene.
6. Set the creation parameters.
Tip: You can use the Move tr ansform to
adjust the location of the light or its ta rget.
7. Click Render Scene to preview the
lighting.
Make any changes you need to adjust the
rendering.
8. Cho ose Rendering > Environment to display
the
Environment p anel (page 3–268) .
9. On the Exposure Control rollout of the
Environment panel, choose Logarithmic
Exposure Control from the drop-down list.
Click Render Preview. The thumbnail preview
shows the effect of exposure control.
10. On the Logarithmic Exposure Control rollout
(page 3–293)
, adjust the sett ings until the scene
lighting is acceptable. The thumbnail preview
updatesasyouadjustsettings.
For example, a brightness of 65 and a contrast
of 50 can be good values for interior scenes.
11. Choose Rendering > Advanced Lighting to
display the Advanced Lighting panel. On
the Select Advanced Lighting rollout, choose
Radiosity as the advanced lighting type.
The rollouts for radiosity are displayed.
12. On the Radiosity Processing Parameters rollout
(page 3–63)
, click Start to beg in processing
radiosity.
13. Click Render Scene to render the scene
after radiosity processing completes.
Example: To process radiosity with standar d lighting:
Photometric lights are recommended for use with
radiosity. But if y ou are working on a scene that
already contains standard lights, you can follow
these guidelines.