Hi,

I am using DIVA 4 for grasshopper for daylight and glare simulations. and I want to know on what basis does the quality list (very low, low, medium and high) was set. Is it somehow justified by the developer through any validation, measurements, ...etc ??

Thanks

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The quality presets are collections of Radiance parameters, based on a combination of our own experience and recommendations in the literature (e.g., Rendering with Radiance, 2011, Ward and Shakespeare).  They should be thought of as a very rough set of templates to steer you in the right direction, rather than ideal settings for any particular scene.  In fact, optimizing Radiance parameters to meet the needs of a specific simulation often takes a bit of trial and error, even for the experienced user.

In addition to the aforementioned book by Ward & Shakespeare (which is a bit hard to find in print), the online Radiance manual pages provide very helpful descriptions of what each parameter controls (e.g., http://radsite.lbl.gov/radiance/man_html/rtrace.1.html).  You may also find this page useful, as it provides a quick outline of the runtime impact and artifacts associated with several commonly used parameters.

These are always directly editable using the "Radiance Parameter" input of the Grasshopper simulation components.  (Hidden by default, so zoom in and find the '+' button.)

Jon


Thanks a lot Jon for the information provided. :) 
Jon Sargent said:

The quality presets are collections of Radiance parameters, based on a combination of our own experience and recommendations in the literature (e.g., Rendering with Radiance, 2011, Ward and Shakespeare).  They should be thought of as a very rough set of templates to steer you in the right direction, rather than ideal settings for any particular scene.  In fact, optimizing Radiance parameters to meet the needs of a specific simulation often takes a bit of trial and error, even for the experienced user.

In addition to the aforementioned book by Ward & Shakespeare (which is a bit hard to find in print), the online Radiance manual pages provide very helpful descriptions of what each parameter controls (e.g., http://radsite.lbl.gov/radiance/man_html/rtrace.1.html).  You may also find this page useful, as it provides a quick outline of the runtime impact and artifacts associated with several commonly used parameters.

These are always directly editable using the "Radiance Parameter" input of the Grasshopper simulation components.  (Hidden by default, so zoom in and find the '+' button.)

Jon

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