Phong specular reflection model or specular reflection, Computer Graphics

Phong Specular Reflection Model or Specular Reflection

This model of local illumination is frequently termed as the Phong specular reflection model. Here we discuss the matter of specular reflection in a more practical manner. See the figure 9 where if R is the ways of specular reflection and V is the ways of the viewer as assigned at the View Reference Point or VRP, then for a perfect reflector the specular reflection is visible merely while V and R coincide. For actual objects as not ideal reflectors the specular reflectance can be seen even if V and R don't coincide, that is observable over range of values or a cone of values. The shinier the surface, the minor the f(α) range for specular visibility. Thus a specular reflectance model should have maximum intensity at R, along with an intensity that decreases like f (α).

516_Phong Specular Reflection Model or Specular Reflection.png

From the above discussion we found that Specular reflection is the consequence of total or near whole reflection of the light in a concentrated region near the specular reflection angle as a and the description of other variables demonstrated in the figure 8 as:

Note:

N        → Unit normal surface vector

R         → Unit vector in the direction of ideal specular reflection

L         → Unit vector in the direction of pt. Light source

V         → Unit vector pointing the viewer.

a          → viewing angle relative to R .

- At a = 0 viewer will observe light of more intensity.

- In case of perfect reflection or ideal mirror, incident light is reflected merely in specular reflection direction.

- Objects the other than perfect reflection exhibit specular reflection over a finite range of viewing positions nearby R as shiny surfaces have narrow specular reflection range and dull surfaces have broad range.

Posted Date: 4/5/2013 2:47:40 AM | Location : United States







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