Autodesk 12812-051462-9011 User Guide 3 - Page 928

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 7132, drag and drop preset luminaire objects on page 295 from the included library. You can also refer to Common Lamp Values on page 5014. 3 Choose Rendering > Environment to display the Environment panel on page 6689. Select the type of exposure control you want to use (typically Logarithmic on page 6740). 4 To preview the lighting, click Render. At this stage, no processing of radiosity occurs, but you can quickly confirm that the direct lighting is correct. If you like, adjust the position of the lights. 5 Choose Rendering > Advanced Lighting > Radiosity, and then confirm any alerts that appear. On the Select Advanced Lighting rollout, make sure Active is on. 6 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. The light levels are stored with the geometry and you can navigate the model interactively without reprocessing the scene. 7 Click Render again. Default Scanline Renderer Controls | 6183