Command entry:Main toolbar (Render Setup) Render Setup dialog Render Elements panel Render Elements rollout Add button Render Elements dialog Add Illuminance HDR Data element to the elements list (or highlight an existing Illuminance HDR Data element in the list).

Command entry:Rendering menu Render Setup Render Setup dialog Render Elements panel Render Elements rollout Add button Render Elements dialog Add Illuminance HDR Data element to the elements list (or highlight an existing Illuminance HDR Data element in the list).

Generates an image containing 32–bit floating-point data that can be used for analyzing the amount of light that falls on a surface perpendicular to its normal. The illuminance data ignores material characteristics such as reflectance and transmittance.

Illuminance is not related to surface properties.

For best results, render with mental ray or another renderer that supports 32–bit floating-point output and set the output format to PIC, HDR, or EXR. If using the scanline renderer or another renderer that doesn't support 32–bit floating-point output, set the Scale Factor parameter, which acts as a multiplier, to adjust the range of values for the output data.

Interface

Scale Factor

When you use a renderer that does not support floating-point output, set Scale Factor to a value less than 1.0. Default=1.0 (no scaling).