What are the three components of the Phong lighting model?

What are the three components of the Phong lighting model?

Phong is a very basic, but real looking light model for surfaces that has three parts: ambient, diffuse, and specular lighting. Ambient Lighting: Ambient lighting is the simplest of the three parts to understand and calculate.

What is specular reflection in Phong shading?

Phong reflection is an empirical model of local illumination. It describes the way a surface reflects light as a combination of the diffuse reflection of rough surfaces with the specular reflection of shiny surfaces.

Which is the correct equation of specular reflection?

As the angle between the view direction and the reflection direction increases, the dot product between the two vectors decreases (and eventually reaches 0). Specular≈V⋅R. Where V is the view direction and R is equal to: R=2(N⋅L)N−L.

How do you find the specular component?

The specular component is calculated by taking the dot product of the reflection vector and the view direction, raised to the power given by the SpecularPower variable making the highlight harder or softer. The result is multiplied by SpecularIntensity to make the highlight brighter or darker.

How do you calculate diffuse component?

If the angle is greater than zero we calculate the diffuse color by multiplying the basic light color by the constant diffuse intensity and then scaling the result by the diffuse factor. If the angle between the light and the normal is 0 the diffuse factor will be 1 which will provide the maximum light strength.

What is the Phong model of local illumination?

Phong reflection is an empirical model of local illumination. It describes the way a surface reflects light as a combination of the diffuse reflection of rough surfaces with the specular reflection of shiny surfaces.

Which is an illustration of the Phong equation?

Visual illustration of the Phong equation: here the light is white, the ambient and diffuse colors are both blue, and the specular color is white, reflecting a small part of the light hitting the surface, but only in very narrow highlights.

When to include specular term in Phong reflection model?

Although the above formulation is the common way of presenting the Phong reflection model, each term should only be included if the term’s dot product is positive. (Additionally, the specular term should only be included if the dot product of the diffuse term is positive.) for the different color channels .

How does Phong describe the way a surface reflects light?

It describes the way a surface reflects light as a combination of the diffuse reflection of rough surfaces with the specular reflection of shiny surfaces. It is based on Phong’s informal observation that shiny surfaces have small intense specular highlights, while dull surfaces have large highlights that fall off more gradually.