- 积分
- 5854
- 回帖
- 0
- 西莫币
-
- 贡献
-
- 威望
-
- 存款
-
- 阅读权限
- 120
- 最后登录
- 1970-1-1
该用户从未签到
|
发表于 2008-10-30 16:59
|
显示全部楼层
来自: 中国湖北十堰
帮助文档中的说明
Creating a Rotated Relative CSTo create a new relative CS with its axes rotated away from another CS's axes:
1. In the history tree, select the CS upon which you want to base the new relative CS, making it the working CS.
2. Click Modeler>Coordinate System>Create>Relative CS>Rotated.
3. Specify the x-axis by selecting a point in one of the following ways:
• Click the point.
• Type the point's coordinates in the X, Y, and Z boxes on the status bar. You can use either relative or absolute coordinates.
To select a point that does not lie in the current plane, use the Movement Mode commands on the shortcut menu.
4. Specify the xy plane by selecting any point on it in one of the following ways:
• Click the point.
• Type the coordinates of a point that is relative to the origin of the working CS in the dX, dY, and dZ boxes.
You do not need to specify the z-axis. It is automatically calculated so that the axes form a right-handed Cartesian coordinate system.
The new relative CS is created. It has the same origin as the previous working CS, but its axes are rotated. It is listed in the history tree under Coordinate Systems. It automatically becomes the working CS; objects that you draw hereafter are based on the coordinates of this relative CS. Default planes are created on its xy, yz, and xz planes.
Creating an Offset and Rotated Relative CSTo create a new relative CS that is both offset and rotated from an existing CS:
1. In the history tree, select the CS upon which you want to base the new relative CS, making it the working CS.
2. Click Modeler>Coordinate System>Create>Relative CS>Both.
3. Select the origin in one of the following ways:
• Click the point.
• Type the point's coordinates in the X, Y, and Z boxes on the status bar. You can use either relative or absolute coordinates.
To select a point that does not lie in the current plane, use the Movement Mode commands on the shortcut menu.
4. Specify the x-axis by selecting a point on the axis in one of the following ways:
• Click the point.
• Type the coordinates of a point that is relative to the origin in the dX, dY, and dZ boxes.
5. Specify the xy plane by selecting any point on it in one of the following ways:
• Click the point.
• Type the coordinates of a point that is relative to the origin of the new CS in the dX, dY, and dZ boxes.
You do not need to specify the z-axis. It is automatically calculated so that it is at a right angle to the y-axis.
The new relative CS is created. It is listed in the history tree under Coordinate Systems. It automatically becomes the working CS; objects that you draw hereafter are based on the coordinates of this relative CS. Default planes are created on its xy, yz, and xz planes.
Creating an Offset Relative CSTo create a relative CS with an origin that lies a specified distance from another CS's origin:
1. In the history tree, click the CS upon which you want to base the new relative CS, making it the working CS.
2. Click Modeler>Coordinate System>Create>Relative CS>Offset.
3. Select the origin in one of the following ways:
• Click the point.
• Type the point's coordinates in the X, Y, and Z boxes on the status bar. You can use either relative or absolute coordinates.
To select a point that does not lie in the current plane, use the Movement Mode commands on the shortcut menu.
The new relative CS is created. Its origin has moved from the previous working CS, but the orientation of the new axes remains the same. It is listed in the history tree under Coordinate Systems. It automatically becomes the working CS; objects that you draw from now on are be based on the coordinates of this relative CS. Default planes are created on its xy, yz, and xz planes. |
|