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In Korea last week at the University of Seoul, I came across another 3D-Isovist package by two guys - Choongsik Kim and Insung Lee which is written in VB (Visual Basic for Autocad) and this method uses ray tracing. There is a paper in Korean and the email address of one of the authors is [log in to unmask] Mike At 08:45 13/09/2004, Alan Penn wrote: >Sanjay, > >That sounds nice - a few questions. >Can it take specifically located observers? Eg. On a grid or at head height >above the topography etc. >What is performance like and how does this scale with numbers of observers? >Where can one get it to try it out? > >Alan Penn > > > -----Original Message----- > > From: [log in to unmask] [mailto:[log in to unmask]] On > > Behalf Of Sanjay Rana > > Sent: 13 September 2004 08:27 > > To: [log in to unmask] > > Subject: GIS Software for 3D VGA > > > > Hello Everyone, > > > > A nightly release of version 1.0-beta of a new series of Isovist Analyst > > ArcView extension, called Isovist Analyst-3D is now available upon > > request. > > This extension performs the following functions: > > _____________________________________________________________ Michael Batty, Director, Centre for Advanced Spatial Analysis (CASA), at University College London, 1-19 Torrington Place, London, WC1E 6BT UK _____________________________________________________________ Tel 44 (0) 207 679 1781 Fax 44 (0) 207 813 2843 email [log in to unmask] The next CUPUM Conference is from June 29-July 1 2005, at CASA in UCL see the web site www.cupum.org. CASA pages are at www.casa.ucl.ac.uk