Retrieves Appearances, Textures, Rasters, or Geometry Definitions from the internal FMELibrary.
Features containing attributes, traits, or references to shared items specifying which items to retrieve.
Features with the retrieved shared item(s).
Features where no geometry part matches the Geometry XQuery.
Features that had no shared item extracted.
Shared Items To Retrieve
This parameter specifies which types of Shared Items to retrieve. Any combination of Appearance, Texture, Raster, and Geometry Definition can be selected.
This parameter specifies whether to retrieve Shared Items using IDs stored on appearances, traits, or from the Geometry Properties themselves.
When retrieving from attributes, this parameter specifies the name of the attribute(s) from which to retrieve Shared Item IDs.
When retrieving from traits, this parameter specifies the name of the traits(s) from which to retrieve Shared Item IDs.
When retrieving Appearances, Textures, or Rasters from Geometry Properties, this parameter specifies side(s) of the geometry from which Shared Items should be retrieved. They can be retrieved from either the front, the back, or both front and back of each specified geometry.
If Output Duplicate Items is set to No, a shared item is output only once if the item is shared by multiple geometries. If this parameter is set to Yes, every single usage of a shared item will output a separate feature, even if there are duplicates.
If Retrieve Items Recursively is set to Yes, Geometry Definitions will have any contained Geometry Instances fully instantiated. Appearances will include retrieved Textures and Rasters. Textures will include retrieved Rasters.
If this parameter is set to No, Geometry Definitions will have any contained Geometry Instances left as references. Appearances will include references to Textures and Rasters. Textures will include references to Rasters.
Use this parameter if you want to isolate only a portion of the geometry passed in to the transformer. If no criteria are specified, the action will apply to the entire geometry at all levels.
Selection can be based on structural location, geometry name, type, appearance information, traits, trait storage types, or definition reference. The syntax used is a restricted set of XQuery, where the return clause is fixed.
The basic Geometry XQuery dialog allows you to construct simple selection queries by automatically writing the necessary query based on specified test clauses. Clicking the Switch to Advanced button opens the Advanced Editor, which allows you to type a query free-form, for more expressive queries.
Note: Once you switch to Advanced mode, you will have to clear all parameters before you can return to Basic mode.
A hierarchical geometry is represented as nodes of type geometry, with attributes containing information about traits, type, and name for each geometry.
Output Feature Handling
This parameter specifies whether to copy attributes from input features onto output features.
If this parameter is set to Drop, then no geometry traits will be copied onto the output Appearance features.
If this parameter is set to Keep as Attributes, all traits from the geometry that referenced the appearance will be copied onto the output Appearance features as attributes.
If Input Traits is set to Keep as Attributes, Output Duplicate Items is set to Yes, and shared IDs are being retrieved from Geometry Properties, this parameter specifies whether to store appearance usage info as attributes. In this case, the following attributes will be placed on the output feature, if appropriate. These values describe in more detail exactly how the Texture was specifically applied to the geometry from which it was referenced.
|Geometry Part Name: This is the Geometry Name that was present on the geometry part that referenced the Appearance|
|Appearance From Front: This attribute will be present and have the value yes if the appearance was placed on the front of the geometry part. This attribute will not be present if it was not attached to the front|
|Appearance From Back: This attribute will be present and have the value yes if the appearance was placed on the back of the geometry part. This attribute will not be present if it was not attached to the back.|
Appearance Texture Gen Info: Generally speaking, this will hold all the details required to understand how the texture coordinates were generated for the geometry part which referenced this appearance. (Texture coordinates may be viewed as a way of mapping from the
Specifically, this parameter contains the data necessary to extrapolate the XYZ to UV transformation required to transform data based in ground coordinates into the same coordinate space as the texture came from.
The values are comma separated in the following format:
Where (X,Y,Z) is the first selected representative coordinate, U1,V1 is the texture coordinate at that location, (dU2,dV2) is the difference between the first and second selected representative texture coordinate, and (dU2,dV2) is the difference between the first and third selected representative texture coordinate. The matrix represented by a,b,c,d,e,f allows for the calculation of two parametric values, alpha and beta such that the following expression can be used to map from (X,Y,Z)space -> (U,V) space, or the reverse, if the user wishes to later bring geometries into the same coordinate space as the Raster, or the reverse, in further feature processing.
Given a ground coordinate (x,y,z), find (u,v):
dX = x-X
dY = y-Y
dZ = z-Z
alpha = a*dX+b*dY+c*dZ
beta = d*dX+e*dY+f*dZ
u = alpha*dU2+beta*dU3+U1
v = alpha*dV2+beta*dV3+V1
For example, one value for this attribute may be:
The name of the attribute on which to store the Shared Item ID of each retrieved item.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
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