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What is the rendering equation used for?
The rendering equation describes the total amount of light emitted from a point x along a particular viewing direction, given a function for incoming light and a BRDF.
What is Phong model in computer graphics?
The Phong reflection model (also called Phong illumination or Phong lighting) is an empirical model of the local illumination of points on a surface designed by the computer graphics researcher Bui Tuong Phong.
What is the difference between Gouraud and Phong shading?
Gouraud shading (AKA Smooth Shading) is a per-vertex color computation. In contrast, Phong shading is a per-fragment color computation. The vertex shader provides the normal and position data as out variables to the fragment shader. The fragment shader then interpolates these variables and computes the color.
Why is Phong shading better than Gouraud?
Phong shading improves upon Gouraud shading and provides a better approximation of the shading of a smooth surface. Phong shading assumes a smoothly varying surface normal vector.
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.
How are specular reflections simulated in the Phong model?
Though we can take the dot product between the view direction and the reflection direction and this gives us an indication of how far the two vectors deviate from each other. This is the principle upping which specular reflections are simulated with the Phong model.
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.
When did Bui Tuong Phong develop the reflection model?
The Phong reflection model was developed by Bui Tuong Phong at the University of Utah, who published it in his 1975 Ph.D. dissertation.