## Linear perspective |

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### Common terms and phrases

abacus apparent contour circle of shade conjugate diameters construct the perspective contour element cube curve of shade cylinder determined elements of shade find the perspective find the shadow found by passing given circle given line ground line H projection H trace horizontal plane infinite distance line of apparent line of intersection line pierces LINEAR PERSPECTIVE lines parallel middle point orthographic projection parallel lines parallel to Tt passing planes picture plane pierce the picture pierces H pierces the plane plane is perpendicular plane of rays plane of shade plane passed planes are parallel point of distance point of rays point of sight projecting plane rays of light rear base required ellipse required point revolved position right line roof shade and shadow shadow cast shadow on H sight parallel spective sphere tangent planes tical tive trace Tt true length upper base vanishing line vertex vertical edge vertical line visual plane