AutoCAD Settings

It is here that you specify how you want AutoCAD and ASRix to work together. The ASR command, which launches the AutoCAD aware rectifier, will behave differently depending on which of these items are selected. If none are selected ASRix will behave as though you had started it independently of AutoCAD. If all are checked ASRix will behave as described in the introduction of this section

• Name extracted from object Xdata
If this is selected you will be prompted to select an AutoCAD entity and ASRix will attempt to locate an image based on Extended Entity Data (EED) attached to the object selected.

By default an entry distinguished by an ampersand (&) the AutoCAD Data Extension (ADE) code for the primary database for that object. If there is no ampersand it will use the first EED record it finds and if there are no EED values attached it will tell you so (unless you have the Object Data feature selected as well).

• Name extracted from CAD Object data
If this is selected you will be prompted to select an AutoCAD entity and ASRix will attempt to locate an image based on the CAD object.

• If the object is TEXT it will use the text string.
For instance you can type or paste a list of all the images you want to incorporate into the CAD drawing and then select the items one by one to process and insert the rectified images.
• If it is a BLOCK it will look for the first attribute. This is helpful if you use a photo key
plan symbol with an attribute which you set to the image name of that shot.
• If it is anything else or if there was no attribute (or EE data if that was selected as well) it will
try the Layer name and if it still cannot find an image you will be given a file selection dialogue box so you can browse for the file you want.
• World coordinate Points selected in AutoCAD
If this is selected you will be expected to supply the world coordinate values by selecting points in AutoCAD.

ASRix will open when given a valid file name and you must select the points in the image for which you have object points in AutoCAD. When you save the file and return to AutoCAD you will be prompted to select each point that will provide the world coordinates for rectification. By default the [end] Object Snap mode is adopted. (no useful results should be expected without some OSNAP set) When all points have been selected ASRix reopens and rectifies the image.

• Close ASRix when image is saved
If this is selected ASRix will close when a file is saved. The only reason you might want to disable this one would be to have a visual reference of the image points selected while you try to determine their equivalents in AutoCAD. If this is disabled you need to remember to manually close ASRix when you are done processing an image or you will end up with a multiplicity of ASRix sessions running simultaneously.
• Insert image after rectification
If this is selected the image will be inserted into the AutoCAD drawing as soon as you press a key after rectifying and saving the image. If the rectification was not completed the routine will abort with a message explaining why it cannot continue.
• Set Display order before inserting image
If this is selected you will be asked to identify any CAD entities you would like to appear over the image. The main reason for doing this would be if you have graphic elements in your drawing corresponding to features in the image. The correlation of the image and the CAD drawing is an indication of the reliability of the rectification. This option is inserted here because it is much easier to select the CAD entities before the image is inserted (Though the display order can be changed at any time).
• Define View after inserting image
If this is selected AutoCAD will adopt the coordinate system of the image and zoom to a plan view slightly larger than the image. This view is then saved with the same name as the layer on which the image was inserted [image-ASR].
• Trim image after insertion
If this is selected you will be expected to trim the image immediately after the image is inserted. Only the details on the plane for which you rectified will be to scale and you should trim off anything else. You can pick as many points as you need to trim the image ending with a return or right click of the mouse.
• Use Relative path for inserted images
By default AutoCAD will try to use the full path to an inserted image. This makes it difficult to share your drawings with someone who is not using the same drive designation or directory structure that you do and it even makes it difficult to move your own work to another drive or directory. If this option is selected ASRix will force the use of a relative path if your images are in the same directory as the drawing or in a sub-directory under it.
• Image Directory
This box shows the directory of the last image accessed either relative to your working directory or as an absolute path depending on the status of the Relative Path check box. This value will be saved with the other settings and, if you always keep your images in the same directory relative to the working directory, will save you having to browse for the next image you use.
• Browse button
This lets you predefine the image directory if you want to save a different directory from the current image directory with your default settings.
• Save settings as defaults
Saves the current settings to the file ASR-set.lsp in the ASRix software directory.
• Load the default settings
Reads the most recently saved settings from ASR-set.lsp

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Inquiries to: steve@icomos.org

Generated by: CART
(Thu Sep 20 17:56:32 2007 )