CAS <sup### [at] cstnetcn> wrote:
> 1: how does pov calculate the value of each pixel of final image?

Via raytracing. Mathematical rays are "shot" from the "camera" towards
the (mathematically defined) scene geometry, and intersections between
this ray and the surfaces are calculated. Then the normal vector and
texture of the surface at that point are calculated, and its color from
them.

> My
> understanding is :using the irradiance and surface properties to calculate the
> value of each pixel of final image. Using the simplistic Phong lighting model to
> calculate the color of each pixel of final image.I didnot set related "phong"
> statements but also get a result.

The "phong lighting model" has nothing to do with "phong highlights".
The latter is one algorithm to calculate (simplistic) highlights, and
you can use it, or another, or none at all.

The "phong lighting model" means that the color of the surface at a given
point is calculated by taking the texture color at that point, adding a
possible (fixed) ambient color to it, multiplying it with a diffuse
component (which is calculated from the direction and intensity of light
sources), and adding a specular component to it (which is calculated
similarly, but with a different algorithm that also takes into account
the direction of the incoming ray.)

POV-Ray also supports a few alternative lighting models that can be
added to that.

-- 
                                                          - Warp

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