Radiance

Radiance logo.

Advanced lighting simulation and rendering package; calculates spectral radiance values (illuminance & color) and spectral irradiance (illuminance & color) for interior and exterior spaces considering electric lighting, daylight and interreflection. Used by architects and designers to predict illumination, visual quality and appearance of design spaces. Used by researchers to evaluate new lighting and daylighting technologies and study visual comfort and similar quantities related to the visual environment.

Keywords

lighting, daylighting, rendering

Validation/Testing

N/A

Expertise Required

High level of computer literacy required; 4 days training, minimum.

Users

Over 200.

Audience

Daylighting, lighting, and architectural designers.

Input

Geometry and materials of design space, including luminaire photometry and surface reflectance characteristics. Translators are available for DXF, Architrion, and IESNA standard luminaire files. Additional translators have been written by third parties for ArchiCAD and others. A third-party (shareware) CAD program, Vision3D, can prepare Radiance input directly.

Output

Luminance and illuminance values, plots and contours, visual comfort levels, photograph-quality images and video animations.

Computer Platform

UNIX-compatible workstation, e.g. Sun, Silicon Graphics, Hewlett Packard, DECstation, NeXT, Mac II running A/UX; 8- or 25-bit color display, 20 megabytes of free disk space, 8 megabytes of RAM, and math coprocessor recommended. IBM 386-compatible DOS port has been produced but is not currently being distributed.

Programming Language

C (Kernnigan and Ritchie standard)

Strengths

Physical accuracy in a graphics rendering package, reliability and source code availability; arbitrary surface geometry and reflectance properties.

Weaknesses

Lacks a graphical user interface, comprehensive documentation, and examples; too few CAD formats supported.

Contact

Company:

Lawrence Berkeley National Laboratory

Address:

Mail Stop 90-3111
1 Cyclotron Road
Berkeley, California 94720
United States

Telephone:

(510) 486-7916

Facsimile:

(510) 486-4089

E-mail:

CKEhrlich@lbl.gov

Website:

http://radsite.lbl.gov/radiance/HOME.html

Availability

Version 2.4 (1994) available free of charge from technical contact via posted tape cartridge (media exchange).