Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Nejc Kilar on 2015-05-21, 12:16:19

Title: Light W
Post by: Nejc Kilar on 2015-05-21, 12:16:19

Hey everyone, I'd like to ask a pretty dumb question here.

The equation for light source power is W/(sr.m^2) but scrolling over the tooltips in Corona it says that the equation is dependant on scene unit settings.

Does that mean that the meter is replaced by cm if so set in the scene unit settings? I.e intensity of 80 in meter mode becomes 800 in cm mode?

Thanks! :)

Title: Re: Light W
Post by: Ondra on 2015-05-21, 15:31:43

Which tooltip specifically you mean?

When using W/sr/m^2, your light intensity is not dependant on scene units, because the intensity is "per m^2" - so it does not depend on the overall light scale/size (same as when you are travelling 80 km per hour, your speed is not dependent on whether you are travelling for 1 or 2 hours)

Title: Re: Light W
Post by: Nejc Kilar on 2015-05-21, 17:41:55

Quote

The default option (W/sr/m^2) is in Corona equal to the "image units".

Oh my, it would appear I am just a lazy reader :) I was refering to the tooltip under Corona light settings - Intensity units. My mistake was reading the tooltip wrong, it says "image units" not "scene units".

Regardless of my mistake, would you mind explaining what do the image units in this case acutally represent?

Title: Re: Light W
Post by: Ondra on 2015-05-21, 18:59:22

it is simple, 0 in image units = black, 1 in image units = white

Title: Re: Light W
Post by: Nejc Kilar on 2015-05-21, 20:11:58

Quote from: Ondra on 2015-05-21, 18:59:22

it is simple, 0 in image units = black, 1 in image units = white

Great, thanks for that Ondra :)