Mathematica Lightning Model?

*To*: mathgroup at smc.vnet.net*Subject*: [mg14724] Mathematica Lightning Model?*From*: Alexander Otte <al at theo.physik.uni-stuttgart.de>*Date*: Wed, 11 Nov 1998 17:53:31 -0500*Organization*: Comp.Center (RUS), U of Stuttgart, FRG*Sender*: owner-wri-mathgroup at wolfram.com

Hi! How can it be, that the shading of an object depends on the distance between object and viewer? The following line of code shows the problem: Plot3D[Sin[x] Cos[y],{x,0,2 Pi},{y,0,2 Pi}, LightSources->{{{1,0,1},RGBColor[1,0,0]}},ViewPoint->1000{1.3,-2.4,2.0}] The surface is rendered with a single color. Even if an object is far away - should't the intensity of diffuse reflected light depend on the angle between the surface normals and the direction of light? So what kind of lightning model (lightning equation) does Mathematica use? Thanks Alex