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enh(ui): add default TF management in TransferFunctionWidget

Michaël KUGLER requested to merge 1065-enh-ui-add-default-tf-management-in-transferfunctionwidget into dev

Description

Changes the TransferFunctionWidgetCfg and TransferFunctionWindowsCfg config id to fetch new standards (sight::config::viz::scene2d::TransferFunctionWidgetCfg)

Add two optional parameters to allow loading pre-registered tf through the path attribute of STransferFunction. Add support to empty path (default value in the config) in the STransferFunction service.

Closes #1065 (closed)

How to test it?

modify the sightviewer plugin.xml

change the TFManagerCfg service, and add

<parameter replace="USE_DEFAULT_TF" by="false" />
<parameter replace="ADDITIONAL_TF_PATH" by="PATH_FOLDER_WITh_TFs" />

verify that the tf proposed doesn't have the default one, and that your specific tfs are present.

Remove the two parameters and verify that the classical behaviour is back.

Edited by Michaël KUGLER

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