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Computer Graphics: Difference between revisions
→Phong reflection model
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If <math>\mathbf{N}</math> is the normal vector, <math>\mathbf{V}</math> is a vector from the vertex to the viewer, <math>\mathbf{L}</math> from the light to the vertex, and <math>\mathbf{R}</math> the incident vector (i.e. <math>\mathbf{L}</math> rotated 180 around <math>\mathbf{N}</math>) then | If <math>\mathbf{N}</math> is the normal vector, <math>\mathbf{V}</math> is a vector from the vertex to the viewer, <math>\mathbf{L}</math> from the light to the vertex, and <math>\mathbf{R}</math> the incident vector (i.e. <math>\mathbf{L}</math> rotated 180 around <math>\mathbf{N}</math>) then | ||
* Ambient is a constant color for every pixel. | * Ambient is a constant color for every pixel. | ||
* The diffuse coefficient is <math>N \cdot L</math>. | * The diffuse coefficient is <math>\mathbf{N} \cdot \mathbf{L}</math>. | ||
* The specular coefficient is <math>(\mathbf{R} \cdot \mathbf{V})^n</math> where <math>n</math> is the ''shininess''. | * The specular coefficient is <math>(\mathbf{R} \cdot \mathbf{V})^n</math> where <math>n</math> is the ''shininess''. | ||
The final color is <math>k_{ambient} * ambientColor + k_{diffuse} * (\mathbf{N} \cdot \mathbf{L}) * diffuseColor + k_{specular} * (\mathbf{R} \cdot \mathbf{V})^n * specularColor</math>. | The final color is <math>k_{ambient} * ambientColor + k_{diffuse} * (\mathbf{N} \cdot \mathbf{L}) * diffuseColor + k_{specular} * (\mathbf{R} \cdot \mathbf{V})^n * specularColor</math>. | ||