specular - Calculate specular reflectance
Syntax
R = specular(Nx,Ny,Nz,S,V)
Description
R = specular(Nx,Ny,Nz,S,V) returns the reflectance
of a surface with normal vector components [Nx,Ny,Nz].
S and V specify the direction to the
light source and to the viewer, respectively. You can specify these directions
as three vectors[x,y,z] or two vectors [Theta
Phi (in spherical coordinates).
The specular highlight is strongest when the normal vector is in the
direction of (S+V)/2 where S is the
source direction, and V is the view direction.
The surface spread exponent can be specified by including a sixth argument
as in specular(Nx,Ny,Nz,S,V,spread).
 | spdiags | | speye |  |
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