翻訳と辞書 Words near each other ・ Oblique Angle ・ Oblique arytenoid ・ Oblique case ・ Oblique cord ・ Oblique correction ・ Oblique dendrite ・ Oblique effect ・ Oblique foliation ・ Oblique icebreaker ・ Oblique muscle ・ Oblique muscle of abdomen ・ Oblique muscle of auricle ・ Oblique muscle of eye ・ Oblique order ・ Oblique popliteal ligament ・ Oblique projection ・ Oblique reflection ・ Oblique ridges of scapula ・ Oblique shock ・ Oblique Strategies ・ Oblique type ・ Oblique vein of the left atrium ・ Oblique wing ・ Oblique-swimming triplefin ・ Obliqui ・ Obliquity (book) ・ Obliquogobius ・ Obliquus capitis ・ Obliquus capitis inferior muscle ・ Obliquus capitis superior muscle Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Oblique projection ： ウィキペディア英語版 Oblique projection :''This article discusses the imaging of 3D objects. For an abstract mathematical discussion, see Projection (linear algebra).'' Oblique projection is a simple type of technical drawing of graphical projection used for producing two-dimensional images of three-dimensional objects. The objects are not in perspective, so they do not correspond to any view of an object that can be obtained in practice, but the technique does yield somewhat convincing and useful images. Oblique projection is commonly used in technical drawing. The cavalier projection was used by French military artists in the 18th century to depict fortifications. Oblique projection was used almost universally by Chinese artists from the first or second centuries to the 18th century, especially when depicting rectilinear objects such as houses. == Overview == Oblique projection is a type of parallel projection: * it projects an image by intersecting parallel rays (projectors) * from the three-dimensional source object with the drawing surface (projection plane). In both oblique projection and orthographic projection, parallel lines of the source object produce parallel lines in the projected image. The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection. Mathematically, the parallel projection of the point $(x,\; y,\; z)$ on the $xy$-plane gives $(x+az,\; y+bz,\; 0)$. The constants $a$ and $b$ uniquely specify a parallel projection. When $a\; =\; b\; =\; 0$, the projection is said to be "orthographic" or "orthogonal". Otherwise, it is "oblique". The constants $a$ and $b$ are not necessarily less than 1, and as a consequence lengths measured on an oblique projection may be either larger or shorter than they were in space. In a general oblique projection, spheres of the space are projected as ellipses on the drawing plane, and not as circles as you would expect them from an orthogonal projection. Oblique drawing is also the crudest "3D" drawing method but the easiest to master. Oblique is not really a 3D system but a two-dimensional view of an object with 'forced depth'. One way to draw using an oblique view is to draw the side of the object you are looking at in two dimensions, i.e. flat, and then draw the other sides at an angle of 45 degrees, but instead of drawing the sides full size they are only drawn with half the depth creating 'forced depth' – adding an element of realism to the object. Even with this 'forced depth', oblique drawings look very unconvincing to the eye. For this reason oblique is rarely used by professional designers and engineers. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oblique projection」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.