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  2. Shader - Wikipedia

    en.wikipedia.org/wiki/Shader

    This shader works by replacing all light areas of the image with white, and all dark areas with a brightly colored texture. In computer graphics, a shader is a computer program that calculates the appropriate levels of light, darkness, and color during the rendering of a 3D scene—a process known as shading.

  3. Local binary patterns - Wikipedia

    en.wikipedia.org/wiki/Local_binary_patterns

    LBP is the particular case of the Texture Spectrum model proposed in 1990. [ 1 ] [ 2 ] LBP was first described in 1994. [ 3 ] [ 4 ] It has since been found to be a powerful feature for texture classification; it has further been determined that when LBP is combined with the Histogram of oriented gradients (HOG) descriptor, it improves the ...

  4. Solutional cave - Wikipedia

    en.wikipedia.org/wiki/Solutional_cave

    Bedrock is dissolved by carbonic acid in rainwater, groundwater, or humic acids from decaying vegetation, that seeps through bedding planes, faults, joints, and the like.. Over time, the surface terrain breaks up into clints separated by grikes and punctuated by sinkholes into which streams may disappear, crevices expand as the walls are dissolved to become caves or cave sy

  5. Cave pearl - Wikipedia

    en.wikipedia.org/wiki/Cave_pearl

    A cave pearl is a small, usually spherical, speleothem (cave formation) found in limestone caves. Cave pearls are formed by a concretion of calcium salts that form concentric layers around a nucleus. Exposure to moving water polishes the surface of cave pearls, making them glossy; if exposed to the air, cave pearls can degrade and appear rough.

  6. Speleogen - Wikipedia

    en.wikipedia.org/wiki/Speleogen

    The United States Code defines speleogens as "relief features on the walls, ceiling, and floor of any cave or lava tube which are part of the surrounding bedrock, including anastomoses, scallops, meander niches, petromorphs and rock pendants in solution caves and similar features unique to volcanic caves."

  7. Speleothem - Wikipedia

    en.wikipedia.org/wiki/Speleothem

    As the acidic water travels through the calcium carbonate bedrock from the surface to the cave ceiling, it dissolves the bedrock via the reaction: CaCO 3 + H 2 CO 3 → Ca 2+ + 2 HCO 3 −. When the solution reaches a cave, the lower pCO 2 in the cave drives the precipitation of CaCO 3 via the reaction: Ca 2+ + 2 HCO 3 − → CaCO 3 + H 2 O + CO 2

  8. Cave of Altamira and Paleolithic Cave Art of Northern Spain

    en.wikipedia.org/wiki/Cave_of_Altamira_and...

    Map of Paleolithic cave art sites in the Franco-Cantabrian region.. The Cave of Altamira and Paleolithic Cave Art of Northern Spain (Cueva de Altamira y arte rupestre paleolítico del Norte de España) is a grouping of 18 caves of northern Spain, which together represent the apogee of Upper Paleolithic cave art in Europe between 35,000 and 11,000 years ago (Aurignacian, Gravettian, Solutrean ...

  9. Vein (geology) - Wikipedia

    en.wikipedia.org/wiki/Vein_(geology)

    White veins in dark rock at Imperia, Italy. In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock.Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation.