2008

material (RGB:255, 255, 255) would have a reflectance of 100%. This means
that the material reflects 100% of the energy received.
■ Exposure Control: The exposure control is the equivalent of the aperture
of a camera. Make sure you enable the exposure control and set a value
that provides the final results you desire.
To process radiosity for photometric lights using a physically based workflow:
1 Ensure that your geometry is set to a physically correct scale and that the
materials have valid reflectance values.
2 Place photometric lights in your scene. The benefit of this workflow is
that it allows you to place lights in your scene the same way you would
in the real world. You can create new photometric lights or, using the
asset browser on page 6928 , drag and drop preset luminaire objects on
page 235 from the included library.
You can also refer to Common Lamp Values on page 5020 .
3 Choose Rendering > Environment to display the
Environment panel on
page 6486 . Select the type of exposure control you want to use (typically
Logarithmic on page 6540 ).
4 Click Render Scene to preview the lighting. At this stage, the
radiosity will not be processed but you can quickly confirm that the direct
lighting is correct. Adjust the position of the lights if desired.
5 Choose Rendering > Advanced Lighting > Radiosity. Make sure that Active
is turned on.
6 On the Radiosity Parameters rollout, click Start to process radiosity. Once
the Radiosity calculation has been completed, you should see your results
in the viewports. The light levels are stored with the geometry and you
can interactively navigate around the model without reprocessing the
scene.
7
Click Render Scene again. The renderer will calculate the direct
lighting and shadows, and the radiosity solution (indirect lighting) will
be integrated as a modulated ambient light.
Default Scanline Renderer Rollout | 5991