Editing Cel shading (section)

=== Edge-detection method ===
{{multiple image

|perrow=3
|align=center
|header=2D [[image processing]] outlining technique

|image1=Cel shading no outlines.png
|caption1=First, the scene is rendered with cel shading to a screen-sized color texture.
|width1=250
|caption2=Then, [[z-buffer|depth information]] of the scene is rendered to a screen-sized texture.

|image2=Cel shading depth.png|width2=250

|caption3=[[World space|World-space]] [[surface normal]]s are rendered as a screen-sized texture.

|image3=Cel shading normals.png|width3=250

|caption5=Finally, a [[Sobel filter]] or similar [[Edge detection|edge-detection]] filter is applied to the normal and depth textures to generate an edge texture. [[Texels]] on detected edges are black, while all other texels are white.

|image5=Cel shading edge detection.png|width5=250

}}
{{multiple image

|align=center
|image1=Cel shading composite final image.png|
|width1=800|
|caption1=Finally, the edge texture and the color texture are [[Compositing|composited]] to produce the final [[Rendering (computer graphics)|rendered]] image.
}}