An Introduction to LucidShape

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2. Digital Mock Up for Lighting ProductsIn order tomake simulations and analysis, a digitalmock up for the lighting/optical producthas to be set up, that is, a collection of optical geometry (reflectors, refractors), light sourcesand light detectors has to be created. LucidShape supports the setup of such a "opticalscene" in the following ways: Geometry may either be defined interactively within Lucid-Studio, calculated in a shell script in LucidScript, or imported from a CAD file.2.1.

The "Form Follows Function" Paradigm with LucidFunGeoLucidFunGeo (standing for LucidShape Functional Geometry) is a broad selection of toolsunder LucidShape, allowing to create optical geometry in various ways
One of the particular strengths of many of the LucidFunGeo tools is the ability to generategeometry directly from optical requirements. For example, for having to compute a freeform reflector which should emit the light in a specific angular direction, one would like tocompute the reflector directly fromthis lighting requirement, rather than having to generateit fromgeometric parameters and checkwhether the optical behaviour iswithin the require-ments, all this in a possibly tedious process cycle. LucidShape supports this "FormfollowsFunction" paradigm whenever possible.

Figure 3: Example for the "Form follows Function" paradigm in LucidShape: An LED based signal lampcomputed directly fromits lighting requirement (left) and verification of the c omputed result fromsimulation(right)Macrofocal Applications for Sharp Cutoff LinesThemacrofocal conceptis away to create sharp cutoff lines (e.g. for automotive lowbeamapplications) by designing reflector or lens arrays that use the edge contours of the entirelight source and not simply a point.

In the LucidShape Macrofocal Applications, a typicalsetup would require the user to define1. a planar grid as the base for the geometry array to be computed, and2. the required light function (target range, type of cutoff etc.) for each grid element.Once the setup is defined, the LucidShape macrofocal solver will compute the desired op-tical array within seconds.

2.2. Standard and Procedural Surfaces via the Conventional ApproachBut also in caseswhere the conventional approach of generation via geometric parametersis preferred, youwill not be disappointed: LucidFunGeo offers dozens of standard geometrieslike planes, paraboloids, or ellipsoids. In addition, the conventional creation of proceduralsurfaces like• rotational surfaces by rotating a curve around an axis• swung surfaces by rotating a curve around an axis with a varying radius• swept surfaces by sweeping a spine curve along a profile curve• pipe surfaces by sweeping a circular profile along a profile curve (essential for light pipeapplications)• interpolation surfaces by interpolating surfaces froma skeleton grid of boundary curvesis supported.