DL-Light extensions are designed according to a general ergonomic principle:
- The main window allows to choose the key elements of the calculation
(model file, type of calculation, period, ...). Organization of the
information aims at reproducing observed
professional approaches. This window is intentionally kept simple and
shows only a minimal set of parameters.
- The additional parameters are a priori common to a series of
calculations. They are defined in the preferences, and are classified
into categories: global parameters, specific to an extension,
- The default values of the parameters are consistent with
This organization facilitates the handling of the tool in simple or recurring
situations, while allowing fine adjustment of the calculation parameters. (As
an illustration, the DL-Light version 12.0 preferences file contains 532
Preferences can be opened from toolbar
or from menu Extensions -> De Luminae -> [Extension name] ->
Parameters are organized into groups:
To restore the default value of a parameter: click on the arrow to the right of
To restore the values of all the parameters of the current tab: click
on the "Defaults" button.
Global preferences are common to all extensions.
In the trial version of DL-Light some options are fixed at their default value.
For more details read License information.
Number of parallel calculations - Maximum number of processes in
parallel on the computer. The maximum is the number of CPU cores.
Show warning messages - Switch on/off warning messages.
Show switching extension message - Switch on/off warning messages
before changing extensions.
Confirmation of virtual layer status change - Switch on/off the
confirmation message when changing status of layers of virtual surfaces.
Enable automatic check for updates - Enable DL-Light to
automatically check on De Luminæ site if new version is available. If
new version is available user is informed, but not forced to download and
Sound notification - Play a sound when computation is done and
duration in seconds is greater than "value". Set to 0 to stay always
Date format - Select the display format for dates.
Display time zone abbreviations - Select the display format for
Abbreviations of time zones - Customize the abbreviations of time
Calculation periods - Customize calculation periods (seasons
dates). DL-Light allows you to set the definitions of the seasons and
their display in the menus.
Default reflectance - Reflectance of default material for surfaces
without defined material.
Take into account north angle - Take into account north angle
parameter (shadow_info['NorthAngle']) for extensions involving Sun
position (Sunexposure, Watt, Daylight Autonomy, Daylight Factor, SEPP65,
Cache directory - Folder used for temporary computations and
"Show only false colors", transparency level - Opacity of surfaces
without result, from 0.0 (transparent) to 1.0 (opaque).
"Show only false colors", remove shadows - Do not display shadows
on surfaces when "Show only false colors" is set.
Configuration of menus and toolbars
This tab allows you to select the icons to display on the toolbars and the
extensions to list in the DL-Light menu.
The configuration of icons is common to all extensions.
To take the modifications into account, restart SketchUp.
This tab contains the main settings for the active extension:
- Radiance settings for relevant extensions (Daylight factor,
Autonomy, Watt, ...).
- Ergonomic parameters: automatic display of the report, content of
- Graphic parameters: algorithm for false color textures.
Some parameters are present on all the extensions:
Show report - Automatic display of the report after
Grid names in report lines - Show the name of the sensors grid
used for the surface, for all surfaces.
Layer names in report lines - Display a "layer" column with
for each surface the name of the layer to which the surface is
Load all at report opening - When opening the report, load all
computed surfaces rows. Otherwise, click on a surface in the model to
load the corresponding row in the report.
Algorithm for false color textures - Setting the generation of
textures. The indicators are calculated on a grid of sensors
according to the Level of details, then these values are
interpreted for visual representation. Several algorithms are
available, see page Interpolation
Maximum texture size - Adjust the maximum size of textures
generated. Warning: for size of 8192 or above, rendering time and
memory usage increase a lot.
Texture smoothing - Adjust the smoothing level of the
Size of snapshot images - Use a fixed width or the width of the
- Use fixed size - Width of the fixed size image (1600 pixels by
- Don't use fixed size - The size of the exported image will
correspond directly to the size of the model on the screen.
This tab contains settings that should be suitable for most situations.
Min face area - Minimal surface area below which surface calculation is
skipped as surface is considered extremely small. If this limit is set to zero,
still be discarded by the threshold distance to borders.
Area limit for single sensor - Area below which a single sensor is
generated for the surface.
Virtual surface offset - Offset default value for virtual
Coverage area of sensors - Assign to each sensor the area
corresponding to the nearest points of the plane (Voronoi diagram).
The traditional alternative is to consider that every sensor represents
the same surface which can lead to anomalies (corner sensors). For most
standards such as BREEAM or EN 17037, it is recommended not to use this
option and to consider that all sensors are equivalent.
Maximum scale in px/m - Texture resolution in pixels per meter.
Actual textures resolution is limited by both this setting and maximum
textures size. For a large model (town planning), use a low value, for
example 10 pixels / meter.
Warning if many surfaces - Warn if surfaces to calculate is above
Cache size - Number of calculations kept in the cache. The cache
allows to accelerate successive calculations on the same project. Each
extension has its dedicated cache. To clear the cache, put this value to
zero and start a calculation.
Complex period - Definition of the complex period used in
'complex' duration mode. See complex
This section provides access to internal software settings. These parameters
should not be changed without support.
More than a hundred parameters are present in this category. They allow the
software to be adapted to particular cases, but they are likely to evolve
with new versions.