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  2. Descriptive geometry - Wikipedia

    en.wikipedia.org/wiki/Descriptive_geometry

    To get a true view (length in the projection is equal to length in 3D space) of one of the lines: SU in this example, projection 3 is drawn with hinge line H 2,3 parallel to S 2 U 2. To get an end view of SU, projection 4 is drawn with hinge line H 3,4 perpendicular to S 3 U 3. The perpendicular distance d gives the shortest distance between PR ...

  3. Tree volume measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_volume_measurement

    The length of a segment can be determined by measuring the position of the end points of the branch in 3-dimensional space from an external reference position. The length is then calculated by applying Pythagorean's Theorem. [20] The following diagram illustrates the process. Three dimensional coordinate calculations

  4. Euclidean distance - Wikipedia

    en.wikipedia.org/wiki/Euclidean_distance

    Formulas for computing distances between different types of objects include: The distance from a point to a line, in the Euclidean plane [7] The distance from a point to a plane in three-dimensional Euclidean space [7] The distance between two lines in three-dimensional Euclidean space [8]

  5. Tree crown measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_crown_measurement

    The length of a segment can be determined by measuring the position of the end points of the branch in 3-dimensional space from an external reference position. The length is then calculated by applying the Pythagorean theorem. [20] The following diagram illustrates the process. Three-dimensional coordinate calculations

  6. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    This has the convenient implication for 2 × 2 and 3 × 3 rotation matrices that the trace reveals the angle of rotation, θ, in the two-dimensional space (or subspace). For a 2 × 2 matrix the trace is 2 cos θ , and for a 3 × 3 matrix it is 1 + 2 cos θ .

  7. Perpendicular distance - Wikipedia

    en.wikipedia.org/wiki/Perpendicular_distance

    In geometry, the perpendicular distance between two objects is the distance from one to the other, measured along a line that is perpendicular to one or both. The distance from a point to a line is the distance to the nearest point on that line. That is the point at which a segment from it to the given point is perpendicular to the line.

  8. Quaternions and spatial rotation - Wikipedia

    en.wikipedia.org/wiki/Quaternions_and_spatial...

    3D visualization of a sphere and a rotation about an Euler axis (^) by an angle of In 3-dimensional space, according to Euler's rotation theorem, any rotation or sequence of rotations of a rigid body or coordinate system about a fixed point is equivalent to a single rotation by a given angle about a fixed axis (called the Euler axis) that runs through the fixed point. [6]

  9. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawings. It is an axonometric projection in which the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.