Physically Based is an open source database of physically based rendering values for CG artists, covering materials, light sources and cameras. It compiles values from publications, manufacturer documentation and user measurements, with each entry linked to at least one reference. The database is separate from the website and is built as an open API that can be integrated into applications as plug-ins, presets or web apps.
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physicallybased.info
npg.org.uk
The National Portrait Gallery's online collection provides a searchable database of portraits from the 8th century to the present day. It covers a primary collection of more than 11,000 paintings, drawings, miniatures and sculptures, a photographs collection of over 250,000 items and a reference collection of over 70,000 portraits. Themed groups and a Schools hub with art and history resources are also listed.