Coordinates: Difference between revisions
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Note:'Global' or 'absolute' coordinates refer to the coordinates of the world. All other coordinate systems are 'local' to an entity.
Note:In world, X axis is north and Y axis is east. On models, X axis is east and Y axis is north.
Tip:There can be multiple origins within the same entity: its own origin, the origin of its model, etc. Each origin defines its own local coordinate system relative to its parent.
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{{note|'Global' or 'absolute' coordinates refer to the coordinates of the [[world]]. All other coordinate systems are 'local' to an [[entity]].}} | {{note|'Global' or 'absolute' coordinates refer to the coordinates of the [[world]]. All other coordinate systems are 'local' to an [[entity]].}} | ||
{{note|In world, X axis is north and Y axis is east. On models, X axis is east and Y axis is north.}} | |||
== Origin == | == Origin == | ||
Revision as of 01:22, 29 August 2011
Coordinates are used to describe locations. Each one is a group of "ordinate" numbers which taken together can be plotted on a grid, one ordinate per dimension.
Coordinates in Source are (X,Y,Z), where X is forward/East, Y is left/North, and Z is up. (0,0,1) is a point one unit directly above the origin.
Coordinates are often stored alongside a set of rotation angles.
Note:'Global' or 'absolute' coordinates refer to the coordinates of the world. All other coordinate systems are 'local' to an entity.Note:In world, X axis is north and Y axis is east. On models, X axis is east and Y axis is north.Origin
The origin of an object is the point at which its local coordinates are (0,0,0). It is the mathematical centre from which local coordinates are relative. It is rarely the centre of the visible object, however.
Tip:There can be multiple origins within the same entity: its own origin, the origin of its model, etc. Each origin defines its own local coordinate system relative to its parent.