Question

How should the distance between the viewer and the surface enter the rendering calculations?

Answer 1

Distance between the viewer and the surface enters the rendering calculations:

• Different reflection models can be utilized to demonstrate light-material cooperations. Phong model, a prominent reflection model recognizes three kinds of light-material connections which are ambient, diffuse and specular.
• Where ambient and diffuse segment collaborations don't take about the watcher's position or its distance from the surface, specular interaction takes the direction of the watcher into the estimation.

Let us see the above diagram

In Phong’s reflection model, specular component of color at any point in the object surface is given by:

,

Where is the proportion of mirrored light (specular) that the watcher receives,

is the specular part's force and

The exponent is the shininess coefficient.

User can use the normalized r and can use the dot product to find, hence the equation becomes:

…(1)

More distant the viewer, the vector v can be assumed to be the same on every point on the object’s surface. This removes the need to recomputed v and hence simplifies the computation. The direction of the watcher determines the specular component of intensity at any point on the object’s surface as evident from equation (1).