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Fast and reliable simulations of luminance and illuminance in daylighting for architectural and urban projects.
Instant sensor calculation.
DGP calculation.

 DL-Instant is a fast simulation software of daylit ambiances for architecture and urban projects. It uses a ray-tracing engine called Embree developed by Intel and adapted by French computing laboratory Gaspard Monge and De Luminæ.

It allows as soon as the conception 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 scientific validity and fiability of natural light distribution on the model. 

DGP (Daylight Glare Probability) results

DGP (Daylight Glare Probability) is an indicator designed to evaluate glare based on the illuminance and luminance in a point of view. DGP is becoming a widely known indicator.

DGP is normally calculated on an high-res HDR image. On this image, luminance and illuminance are collected by calculated the DGP. In this workflow, one first needs to make a high quality image, then calculate the indicator.

In DL-Instant, the image is progressively refining, so is the DGP. As you can see when testing, the DGP gets stable very quickly during the rendering of the image. You can hence get a much faster result than with the traditional workflow.

To make this complex calculation simple, DL-Instant handles the calculation during the rendering itself. When the value becomes stable, the proper result has been reached. It usually appear in minutes.

During the rendering of the image, just one click activates the calculation of Daylight indicators such as DGP.

DGP in Instant

DGP = 0.1923

DGP in Instant

DGP = 0.2657

Validity of DL-Instant results

We validate the quality of DL-Instant approach by comparison with Radiance imagine system. 

Radiance ray-tracing engine is certainly the most reliable platform to calculate quality luminance, illuminance and high-quality images in Daylighting.

In order to validate DL-Instant, we systematically compare our results with those of Radiance generated images. Below is a set of examples to test how DL-Instant distributes natural light on a test scene.

That scene has been designed to ensure multiple boucing accross several materials, various shapes, various sizes.

These images are luminance renderings, hence the values expressed in cd/m². The same validations have been performed on illuminance renderings, hence in Lux.

Glass test in Instant

Glass material test in DL-Instant

Glass test in Radiance

Glass material test in Radiance

Transluscent material in Instant

Transluscent panel test in DL-Instant

Transluscent material in Radiance

Transluscent panel test in Radiance

Mirror material in Instant

Mirror test in DL-Instant

Mirror material in Radiance

Mirror test in Radiance

Metal test in Instant

Metal test in DL-Instant

Metal test in Radiance

Metal test in Radiance