Actually you only need unit conversion for lights that are set to work in a real physical scale, such as cd, lm or Watts. IES lights should always need a unit conversion if one wants to get the real intensity of it. In MR the unit conversion is only on the light shaders itself that require it, such as the mia_photometric_light. Both V-Ray and Arnold has the ability to adjust the diffuse intensity depending on the size of the light, so bigger scene/scale requires bigger lights = more diffuse.
/Jens On Fri, Feb 22, 2013 at 3:11 AM, Stephen Blair <[email protected]>wrote: > Hi > > Arnold doesn't have units. > > Steve > Solid Angle Support > > > On 21/02/2013 8:28 PM, Emilio Hernandez wrote: > > Thank you Max. Working with MR for the last 20 years and switching to > other render engines. For Arnold I don't find any units system like > Maxwell or Vray. Is there any? > > > 2013/2/21 Massimo Galluzzo <[email protected]> > >> Hello, just to clarify this >> in maxwell you can decide the settings for unit system, check here >> http://support.nextlimit.com/display/maxwelldocs/Softimage+-+Render+options >> its in the global render options, the paramter is called “Global scale >> factor” and if in softimage you adopt 1 SI unit = 10 cm, then the global >> scale factor should be set at 0.1. >> >> Vray has also the Unit converter in its tab called “Units” which you can >> check here >> http://www.spot3d.com/vray/help/softimage/150R1/render_params_units.htm >> and its already set at 0.1 assuming people would use the most common used >> measure in Softimage which is 1 SI unit = 10 cm [image: Sorriso] >> >> Regarding the whole unit system, in Softimage you decide how much is your >> 1 unit and model/light based on that decision, all render engines has this >> unit conversion, Mental Ray doesnt really need since it is embed in. >> >> Hope that helps, >> >> Max >> >> *From:* Emilio Hernandez <[email protected]> >> *Sent:* Thursday, February 21, 2013 10:41 PM >> *To:* [email protected] >> *Subject:* Re: Units convention for lighting and rendering >> >> Thanks Julien. It seems that the 1 unit = 10 centimeters gives me >> different intensities in render engines where you can't define the >> softimage scale like Vray or Maxwell. >> >> >> 2013/2/21 julien carmagnac <[email protected]> >> >>> We use at work : 1 unit = 1 meter >>> >> >> >> >> -- >> >> > > > -- > > > -- Jens Lindgren -------------------------- Lead Technical Director Magoo 3D Studios <http://www.magoo3dstudios.com/>
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