Traditional Culture Encyclopedia - Photography and portraiture - Projection and parallel photography
Projection and parallel photography
Middle school mathematics, mainly learning the projection of points, lines and surfaces;
Projection of a point: from a point perpendicular to a straight line or a plane, the vertical foot is the projection of the point;
Projection of a straight line: the projective connection of points on a straight line segment is the projection of this straight line segment;
Projection of a surface: the total projection of all points on a surface is the projection of this surface;
Therefore, there is no difference between positive and negative projection, so you can refer to the "projection theorem" related to this concept.
2. About projection:
In middle school mathematics, projection is mainly related to vector projection, which can be any real number, positive and negative (version A is compulsory for four students in high school mathematics);
Related to projection is the concept of "orthographic projection", which refers to projection.
According to the definition in People's Education Edition B, the projection of a vector is a vector (that is, the shadow vector pointing to the same side), and the vector projection is the number of vector projections;
3. Summary: For an object without direction, projection or projection is not positive or negative; If there is a directional body, its projection or projection will be positive or negative or directional.
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