Difference Between Gouraud Shading And Phong Shading

Difference between Gouraud shading and Phong shading in Tabular Form

Contents

1 Difference between Gouraud shading and Phong shading in Tabular Form
- 1.1 Gouraud And Phong Shading Comparison
- 1.2 Comparison Chart
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Gouraud And Phong Shading Comparison

The Key Difference Between Gouraud Shading And Phong Shading is that At Gouraud shading the light is calculated per-vertex (Vertex shader) While at Phong shading the light is calculated per fragment.

Gouraud Shading And Phong Shading Comparison

Comparison Chart

	Gouraud Shading	Phong Shading
1	Gouraud shading was introduced by Henri Gouraud in 1970.	Phong Shading was introduced by Phong Bui Tuong in 1973.
2	Evaluate the illumination at border vertices and interpolates.	Evaluate the illumination at every point of the polygon surface.
3	Interpolates colors along edges and scanline.	Interpolates normals instead of colors.
4	Cheaper than the Phong Shading.	More costly than Gouraud Shading.
5	Lighting Equation used at each Vertex.	Lighting Equation used at each Pixel.
6	Requires average processing and less time.	Requires high processing and more time.
7	Gouraud Shading produces average quality.	Phong Shading produces good quality.
8	High Cost.	Low Cost.
9	It gives less accurate results.	It gives more accurate results.

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