Autodesk 12812-051462-9011 User Guide 3 - Page 1504

Above: Correct range for a scene Middle: Too narrow a range Below: Too great a range Narrowing the range to focus on a single object General Guidelines for Physical Scale Values ■ If you use only Photometric lights on page 5005, IES Sun on page 5154, and IES Sky on page 5157, the Physical Scale value is disregarded, and you don't need to change it. ■ If you use Standard lights on page 5049, the Physical Scale value acts as a conversion scale that the radiosity engine uses to calculate energy. Set it to the equivalent of the brightest light source in the scene. This will set the appropriate conversion scale for reflections, self-illumination, and all other non-physically based elements a 3ds Max material offers. However, if you use the Affect Indirect Only flag in the Logarithmic Exposure Control on page 6740, you don't need to worry about the physical scale setting. Spectrum bar Shows the spectrum-to-intensity mapping. The numbers below the spectrum range from the Minimum to the Maximum settings. When rendering with pseudo color, the spectrum bar is displayed beneath the pseudo color image, labeled either Luminance or Illuminance. Lighting Data Exporter Utility Utilities panel > Utilities rollout > Lighting Data Export The Lighting Data Exporter renders the active viewport to images that include luminance on page 8029 and illuminance on page 8009 data that can be used for lighting analysis. The Lighting Data Exporter does not render the files unless you have applied an exposure control on page 6732 to the scene. Exposure Controls | 6759