Re: fade to mauve
- To: mathgroup at smc.vnet.net
- Subject: [mg24411] Re: fade to mauve
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Tue, 18 Jul 2000 00:58:09 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <8kjesh$e80@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, thats's because the LightSources are placed arround your head (in the camera coordinate system) if your camera moves to a far place the light source move also. You must compute the light sources in world coordinates and transform it to the camera coordinates using the ViewPoint, ViewCenter and ViewVertical parameter of our plot. The z-direction is ViewPoint-ViewCenter, the y-direction ViewVertical. And you must redo the calculation when your view point changes. Hope that helps Jens > SNIP SNAPP > When I draw big things and need to use big Viewpoints to get the > perspective right, they lose their lighting. > > I don't see why it has to be this way. > > Dr. C. J. Purcell