DL-Instant : Help

A module of DL-Light suite

Introduction SketchUp Interface Rendering Interface License


DL-Instant is a fast rendering software of daylight ambiances for architecture and urban projects.

It allows as soon as the design phase to study natural light directly from a SketchUp model.

DL-Instant is a module of DL-light suite and it shares the same general philosophy: " Use the most sophisticated technical tools and hide complexity to give to the user, as early as possible, valid information and chart inside their conception tool. "

3D rendering tools generally aim to generate the nicest possible images, and provide a realism that brings in the user's subjectivity.

On the oppposite, DL-Instant focuses on the validity and fiability of natural light on the model.

inside view

Beyond a simple image rendering, DL-Instant implements a path-tracing technic able to calculate in real time fundamental light scales for the project: luminance and illuminance.

In order to reach fast and precise results, a probe system has been implemented inside DL-Instant. During image computation (hundred of thousands of pixels), a right-click on the image put probes on the geometry.

The probe identifies a spot where computation is done faster.

Probes are computed faster than the whole image and allow you to study luminous ambiance very quickly before the image is completely computed. It allows the program to compute the probes with the highest accuracy.

vue sondes

You can watch probes values in the probe window stabilizing in a few seconds, while the image is still calculating.

Designers can understand quickly and precisely if the project uses natural light in an efficient way.

DL-Instant is a tool allowing a fast project study before the use of heavier procedures like daylight factor or luminous autonomy.

It allows to know if the project is efficient regarding natural light before giving the heavier computation to a specialized office.

The user can watch the project from different points of view that are all calculating simultaneously.

vue multiples

DL-Instant uses the pathtracer Embree developed by Intel. De Luminæ has developed DL-Instant with Embree to ensure the validity of computed images regarding natural light and to keep the compatibility with Radiance output, the reference engine on the photo-realistic rendering.

DL-Instant uses two technics:

This double technic allows to obtain:

DL-Instant combines:

DL-Instant has been designed for:


Interface SketchUp

Dl-Instant main window can be opened from the toolbar button DL-Instant_dialog or from menu with option Extensions->De Luminae-> DL-Instant-> DL-Instant.

In this dialog main data are given and calculation are launched. It contains 2 tabs: A General tab with the necessary information to launch calculation and a Material tab for the definition of the materials that will be attached to the various layers of the model.

General tab

DL-Instant General tab


Material tab

Material of each face of the model are very important for the distribution of natural light.

In order to define materials for the objects in the model, it is necessary to attach to each layer of the model a specific material.
When a material is attached to a layer, all the faces belonging to that layer have the same material. If you add a face to that layer, it will automatically have the same material.

The Material tab has 2 parts:

To attach a material to a layer, select a material and double-click on the desired layer.
You may select several layers with the tick box, select a material and click "Attch/Detach" to attach a matrial to all the selected layers.

Optical characteristics of the materials, colours, transparency, etc. are defined in the material manager. To access the material manager, click on the blue ball in the "Material" tab.

The material manager dialog is opened. This dialog is identical for all DL-Light suite modules.

Rendering Interface

Main menu

Rendering Window



Window for Indicators

The window for indicators is used to display the values for the following daylight indicators:

In this window, the indicators are calculated for each of the views that are displayed.

In order to avoid unnecessary calculations, the indicators are calculated when you click on the Start button on the top left.

Once the calculation are started, they are repeated to follow the evolution of the image. It can be noted that the values are very quickly stable even as the image continues to evolve. It comes from the fact that a very large number of the pixels are already calculated precisely all over the image and that they represent an already good sample for the calculation of the indicators.

Probes Window


Array content

Palette window

The palette is used to control the display of the false colours. Each colour corresponds to an interval of illuminance or luminance as in the following images:

False colour image

The above image has been produced with the following palette:


Add a color

Value modification

note: it's necessary to click on Apply button to update the modifications.

Change palette

To show/modify an illuminance or luminance, click on the appropriate tab.

Information and Language window


Software limitation of the evaluation version (without a license number) are :

Details on the license can be found in the license information page.

Installation Requirements

Technical information

Sketchup extension DL-Instant is written in Ruby and Python. Extension code uses standard Ruby API library provided by SketchUp.

Graphical interface is written in WebDialog provided by SketchUp, with HTML files to describe UI contents.

The computing engine is written in C++/C#.

Numeric and visual results given in SketchUp were validated on projects and compared to results provided by radiance.

DL-Instant Extension
Copyright (c) 2017
De Luminæ