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Light patterns, such as objects having light and shaded areas, help when creating the illusion of depth on paper. [2] [3] There are various techniques of shading, including cross hatching, where perpendicular lines of varying closeness are drawn in a grid pattern to shade an area. The closer the lines are together, the darker the area appears.
In technical drawing, the section lining [3] may indicate the material of a component part of an assembly. Many hatching patterns have been standardized by the American National Standards Institute (ANSI) and the International Standards Organization (ISO), though there are many other predefined patterns that may be used. Thus, the hatching ...
After drawing the outline, back-face culling is set back to normal to draw the shading and optional textures of the object. Finally, the image is composited via Z-buffering, as the back-faces always lie deeper in the scene than the front-faces. The result is that the object is drawn with a black outline and interior contour lines.
Subsurface scattering is an indirect form of reflection where some of the light is transmitted into a semi-transparent material, scattered under the surface and bounced back out again.
Shadow mapping or shadowing projection is a process by which shadows are added to 3D computer graphics. This concept was introduced by Lance Williams in 1978, in a paper entitled "Casting curved shadows on curved surfaces."
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Stippling is the creation of a pattern simulating varying degrees of solidity or shading by using small dots. Such a pattern may occur in nature and these effects are frequently emulated by artists. Such a pattern may occur in nature and these effects are frequently emulated by artists.
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