LSS Chronolux
The main goal of LSS Chronolux is to test insolation duration and SVF at a given point
LSS Chronolux


  • interactive real-time duration of insolation testing and SVF calculation at a pointer position
  • graphical representation of duration of insolation and SVF testing results
  • duration of insolation of an area defined by a face or surface testing
  • listing of processed test points
  • setting a testing time period and testing accuracy
  • manual refreshing of testing results if it is necessary after model changes
  • help system
  • instructor is enabled while LSS Chronolux tools are active

Terms and Definitions

Insolation is the solar radiation that reaches the earth's surface. It is measured by the amount of solar energy received per square centimetre per minute.

Duration of Insolation at a given point is the time period while direct sunlight reaches the test point.

SVF (sky view factor) is the extent of sky observed from a point as a proportion of the total possible sky hemisphere. (A Dictionary of Earth Sciences | 1999 | AILSA ALLABY and MICHAEL ALLABY).

WVF (window view factor) is the extent of sky observed from a point as a proportion of the total possibly observable sky from a point through a window (despite of shadowing objects outside the window).


Learn more at


Аватар пользователя Beppe C.


Аватар пользователя fabian3412 .


Аватар пользователя Andreas W

Hello Kirill,

i tried to change the date for calculation but it always switches back to 09/22.

I am using sketchup 2015.

Greetings Andi

Аватар пользователя Kirill B

Hi Andreas,
I didn't know that Chronolux is even able to work in SU2015. The point is that the latest version of Chronolux compatible with SU2013 (and older). In SketchUp 2015 structure of folders differs from earlier versions so it was necessary to update extension in order to make it compatible with SU2015, but I haven't done it yet. So in SU2015 extension can not find its resource files and as a result it can not display global settings dialog and time settings dialog.
For now in SU2015 it is possible to set any desired time within Shadow Info roll, then pick this time as a start or end testing time by clicking of appropiate button of Chronolux toolbar:
Extension displays warning message with testing steps count and asks if it is necessary to regenerate sun-scale. So it is possible to try to set testing period without time settings dialog.
I hope I'll finally find a time to update Chronolux in order to make it compatible with SU2015.


Аватар пользователя Adorian C

Hi Kirill
Please do the upgrade to 2015 please, your plugin its amazing ;)

Аватар пользователя Benjamin S

I really love your extension.

But i had a question and i hope you can help me with it. I am interested in the insolation on a building facade for not just a regular day but more during the whole year. Is it also possible to use your tools with this. I just started to work with this tool. I tried to use the test face and then time settings a month but then i get results with average 11 hours sun that looks a bit strange and really a lot of lines

Thanks in advance.

Аватар пользователя Kirill B

Hi Benjamin,
First of all thanks for kind words! Speaking of annual insolation study: I was going to implement such functionality somehow, but looks like it is necessary to use something more fast

than Ruby in order to achieve accurate results. For now it is possible to calculate only roughly approximate results, because in order to get reasonable testing time it is necessary to

increase "Time Increment" value within "Time Setup" dialog so quality of testing drops down when "Time Increment" gets bigger.
Speakin of iso-lines quantity: note that it is possible to adjust count of insolation iso-lines by setting appropriate value of "Isolines Step" This setting is described

within "Global Settings" chapter of extension's help system

The most important thing to take in account when testing a period longer, than a day, is that current version of Chronolux does not estimate average duration per day of a year (or

month) it estimates _total_ duration when insolation occur during given testing period. In case of face or surface testing extension calculates average insolation duration of the face or

surface (it is not average per day, it is average per face or surface).


Аватар пользователя d j
d j

I'm trying to export a model in black and white style with shadows - in a vector format. Trying PDF - no shadow. Trying Layout - no shadows when I choose vector rendering...

Will LSS Chronolux work?

Аватар пользователя Kirill B

Hi D J,
I'm afraid LSS Chronolux will not help to solve this problem, because it does not affect styling or appearance of shadows. It uses SketchUp's built-in real-world shadows engine to examine incidental insolation at a given point, so it does not calculate (or draw) analytic (or vector) dropping shadows itself.
You may try to use 'Hybrid' rendering in LayOut in order to enable dropping shadows. They have to appear in PDF as well, but I'm afraid dropping shadows will remain raster:

Аватар пользователя Vladimir Syroezhkin

Amazing tool! But it's falling down all time.
OS X 10.8.4

4754 users
9.96 МБ
1.2.2; июня 6, 2013
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Extensions: 5
Architect since 2000. SketchUp enthusiast since 2008.