Surface graphics (Plot3D) colouring question

*To*: mathgroup at smc.vnet.net*Subject*: [mg31822] Surface graphics (Plot3D) colouring question*From*: "DIAMOND Mark R." <dot at dot.dot>*Date*: Wed, 5 Dec 2001 06:51:46 -0500 (EST)*Organization*: The University of Western Australia*Sender*: owner-wri-mathgroup at wolfram.com

Background: I have reason to calculate the volume over a (non-centred) circular area of a bivariate normal distribution (BND). By non-centred, I simply mean that the centre of the disc does not correspond with the means of the two normal distributions. My solution was to change the (BND) to polar coordinates and then integrate over r and theta of the circular area. Seems OK although I'd be interested in any better solution. Current problem (question). I would like to illustrate what is being done in the integration, and to this end would like to construct a surface graphic (probably with Plot3D or ListPlot3D) of the BND, but then I would like to color a part of the suface (the part being defined by the underlying disc) in a distinctive colour (I should probably say "distinctive colours" since keeping some part of the Lighting as well as grid would be nice). Has anyone done something like this before? I searched the archive but found no similar question. Cheers -- Mark R. Diamond Send email to psy dot uwa dot edu dot au and address to markd http://www.psy.uwa.edu.au/user/markd