Autodesk 12812-051462-9011 User Guide 3 - Page 930

■ Natural Lighting: To simulate natural lighting without using the physically based workflow described above, you can use only a Direct Light on page 5057 for the Sun and Skylight on page 5065 to produce skylight on page 8129. ■ Exposure Control: Standard lights are not physically based, so use the Logarithmic Exposure Control on page 6740 for the radiosity solution. Be sure to turn on Affect Indirect Only. The Brightness and Contrast controls of the exposure control will affect only the radiosity solution and your lights will render as usual. To process radiosity with standard lighting: 1 Ensure that your geometry is set to a physically correct scale. 2 On the Create panel, click Lights. Create and position standard lights on page 5049 in your scene. 3 To preview the lighting, click Render. At this stage, the radiosity is not processed, but you can quickly confirm that the direct lighting is correct. Adjust the position of the lights if desired. 4 Choose Rendering > Advanced Lighting > Radiosity and confirm any alerts that appear. On the Select Advanced Lighting rollout, make sure Active is on. 5 To process radiosity, on the Radiosity Processing Parameters rollout, click Start. Once the Radiosity calculation has been completed, you should see your results in the viewports. 6 To display the Environment panel on page 6689, where you set exposure controls, in the Interactive Tools group of the Radiosity Processing Parameters rollout, click Setup. 7 When working with non-physically based lights, always use the Logarithmic Exposure Control on page 6740. On the Logarithmic Exposure Control Parameters rollout, turn on Affect Indirect Only. This causes the exposure control to affect only the results of the radiosity solution. This way you maintain the way your direct lights render without radiosity. Use the Brightness and Contrast controls of the exposure control Default Scanline Renderer Controls | 6185