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I wanted to know is it possible to measure the intensity of the brightness falling on a cube in blender 2.8. Example: I have attched an image, in the image the brightness of the light falling on the face of box-1 is higher than the brightness of the light falling the face of box-2. Is there any way to measure the intensity of brightness falling on those boxes in blender.enter image description here

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A few alternatives:

Use the false colour view transform in the color management.

enter image description here enter image description here

(from https://sobotka.github.io/filmic-blender/)

False Colour. This Look is an extremely useful tool for evaluating your image in terms of the dynamic range and latitude. It is a colour coded “heat map” of your image values, according to the following codes:

enter image description here

Or render an image, and you can probe the values for the pixels under the cursor by pressing the right mouse button wile hovering over the image.

enter image description here

The values appear at the bottom of the image editor screen. You can see the coordinates of the pixel, and values before and after the color transforms of the color management.

Or you can measure the brightness of the image using a waveform monitor in the scopes section.

The scale here is 0 for black and 100% for white.

enter image description here

Note that these values are after the color transforms, or display referred values.

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    $\begingroup$ Thank you very much for your response susu. Thank you for sending in so many alternatives. $\endgroup$ – Sourabh Manchale Jul 20 at 5:50

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