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2. Differential geometry of surfaces - Wikipedia

   en.wikipedia.org/wiki/Differential_geometry_of...

   A ruled surface is one which can be generated by the motion of a straight line in E 3. [46] Choosing a directrix on the surface, i.e. a smooth unit speed curve c(t) orthogonal to the straight lines, and then choosing u(t) to be unit vectors along the curve in the direction of the lines, the velocity vector v = c t and u satisfy

3. Sett (paving) - Wikipedia

   en.wikipedia.org/wiki/Sett_(paving)

   Laying setts in Edinburgh, Scotland, in 2013 Setts in pallet collars. A sett, also known as a block or Belgian block, [1] is a broadly rectangular quarried stone used in paving roads and walkways.

4. Smoothness - Wikipedia

   en.wikipedia.org/wiki/Smoothness

   Smooth functions with given closed support are used in the construction of smooth partitions of unity (see partition of unity and topology glossary); these are essential in the study of smooth manifolds, for example to show that Riemannian metrics can be defined globally starting from their local existence.

5. Track surface - Wikipedia

   en.wikipedia.org/wiki/Track_surface

   The first synthetic surface used for thoroughbred racing was Tropical Park's Tartan turf, a synthetic surface similar to Astroturf installed in 1966. Tartan turf was never a success with horsemen. [6] The first synthetic surface to replace dirt in the United States was installed at The Meadows Racetrack and Casino in Washington, Pennsylvania in ...

6. Horse blanket - Wikipedia

   en.wikipedia.org/wiki/Horse_blanket

   Standard horse blankets are commonly kept on a horse when it is loose in a stall or pasture as well as when traveling. Different weights are made for different weather conditions, and some are water-resistant or waterproof. Modern materials similar to those used in human outdoor wear are commonly used in blanket manufacture.

7. Bump mapping - Wikipedia

   en.wikipedia.org/wiki/Bump_mapping

   The modified surface normal is then used for lighting calculations (using, for example, the Phong reflection model) giving the appearance of detail instead of a smooth surface. Bump mapping is much faster and consumes fewer resources for the same level of detail compared to displacement mapping because the geometry remains unchanged.