Computer Graphics: Difference between revisions

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→‎Shading

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 ==Shading==
 {{main | Wikipedia:Shading}}
-===Flat Shading===
+===Interpolation===
-In flat shading, the color is computed for each face.
-===Gourard Shading===
+* Flat shading - color is computed for each face/triangle.
-In Gourard shading, the color is computed in the vertex shader so it's computed only for each vertex.
+* Gourard shading - color is computed for each vertex and interpolated.
+* Phong shading - color is computed for each pixel with the normal vector interpolated from each vertex.
-===Phong Shading===
+===Lambert===
-{{main | Wikipedia: Phong shading | Wikipedia: Phong reflection model}}
+{{main | Wikipedia: Lambertian reflectance}}
-See [https://www.scratchapixel.com/lessons/3d-basic-rendering/phong-shader-BRDF scratchapixel phong shader BRDF]
+This is a way to model diffuse (matte) materials.
+===Phong reflection model===
+{{main | Wikipedia: Phong reflection model}}
+See [https://www.scratchapixel.com/lessons/3d-basic-rendering/phong-shader-BRDF scratchapixel phong shader BRDF].
+This is a way to model specular (shiny) materials.
 Here, the image is a linear combination of ambient, diffuse, and specular colors.
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 The final color is <math>k_{ambient} * ambientColor + k_{diffuse} * (N \cdot L) * diffuseColor + k_{specular} * (R \cdot V)^n * specularColor</math>.
-In Phong shading, the color is computed in the fragment shader where normals are interpolated between vertices from being passed by the vertex shader.
+;Notes
+* The diffuse and specular components need to be computed for every visible light source.
+===Physically Based===
+See [https://static1.squarespace.com/static/58586fa5ebbd1a60e7d76d3e/t/593a3afa46c3c4a376d779f6/1496988449807/s2012_pbs_disney_brdf_notes_v2.pdf pbs disney brdf notes] and the [http://www.pbr-book.org/ pbr-book]
+In frameworks and libraries, these are often refered to as ''standard materials''.
 ==More Terms==