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What is Phong model and Gouraud shading?
As I understand it, Gouraud shading calculates light color for each vertex and does interpolation on that color, whereas Phong shading interpolates the normal for each pixel and calculates light color based on that interpolated value.
What do you mean by Gouraud shading?
Gouraud shading is a method used in computer graphics to simulate the differing effects of light and colour across the surface of an object. To complete the shading, the image is filled by lines drawn across the image that interpolate between the previously calculated edge intensities.
What’s the difference between Gourard shading and Phong shading?
Gourard shading is in between the two: like Phong shading, each polygon has one normal vector per vertex, but instead of interpolating the vectors, the color of each vertex is computed and then interpolated across the surface of the polygon. On modern hardware, you should either use flat shading (if speed is everything)…
What’s the difference between Phong shading and vertex shader?
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. Here is an illustration of the Phong Shading:
How are surface normals determined in Gouraud shading?
In Gouraud shading, an estimate to the surface normal of each vertex in a polygonal 3D model is either specified for each vertex or found by averaging the surface normals of the polygons that meet at each vertex.
Which is the best method for flat shading?
1 Answer 1. Flat shading is the simplest shading model. Each rendered polygon has a single normal vector; shading for the entire polygon is constant across the surface of the polygon. With a small polygon count, this gives curved surfaces a faceted look. Phong shading is the most sophisticated of the three methods you list.