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Difference between revisions of "Modal Shortcuts"
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→Directions of a node
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In a local Cartesian coordinate, all the points have the same directions with local axis. These three directions accord with right-hand rule. | In a local Cartesian coordinate, all the points have the same directions with local axis. These three directions accord with right-hand rule. | ||
[[File:cartesian.png|framed|none]] | |||
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In a local spherical coordinate: the x direction vector start from the origin point to node point ''P''; the y direction is tangential to the longitude circle; and the z direction is tangential to the latitude circle. These three directions accord with right-hand rule. | In a local spherical coordinate: the x direction vector start from the origin point to node point ''P''; the y direction is tangential to the longitude circle; and the z direction is tangential to the latitude circle. These three directions accord with right-hand rule. | ||
[[File:spherical.png|framed|none]] | |||