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--- visual3d:documentation:pipeline:pipeline_commands:set_pipeline_parameter_from_expression [2024/07/12 13:31] – removed sgranger
+++ visual3d:documentation:pipeline:pipeline_commands:set_pipeline_parameter_from_expression [2024/07/17 15:46] (current) – created sgranger
@@ Line 1: / Line 1: @@
+====== Set Pipeline Parameter From Expression ======
+**Set_Pipeline_Parameter_From_Expression**
+/PARAMETER_NAME=t_Mass
+/EXPRESSION=METRIC::PROCESSED::HEIGHT * 4.6
+/AS_INTEGER=TRUE
+**;**
+The pipeline parameter contains the value of the expression.
+Getting the syntax correct can be challenging because there can be a conflict between the & as a concatenation parameter in a pipeline parameter and the & as a boolean "and" operator.
+For many pipeline commands Visual3D recognizes the conflict and handles the situations in a context specific way.
+Visual3D cannot make that distinction and "bad" things happen.
+Consider the following which uses string comparisons and a pipeline parameter in the expression:
+**Set_Pipeline_Parameter_From_Expression**
+/PARAMETER_NAME= MVAL
+/EXPRESSION=(&::TAG_NAMES& == Utility) * 4.6
+/AS_INTEGER=FALSE
+**;**
+The goal was to set MVAL to 4.6 when the pipeline parameter TAG_NAMES was equal to the string "Utility";
+One solution is to separate the pipeline parameter from the expression.
+**Set_Pipeline_Parameter**
+/PARAMETER_NAME=TEMP
+/PARAMETER_VALUE=(&::TAG_NAMES& == Utility)*4.6
+**;**
+\\
+**Set_Pipeline_Parameter_From_Expression**
+/PARAMETER_NAME=t_Mass
+/EXPRESSION=::TEMP
+/AS_INTEGER=FALSE
+**;**
+\\
+Another solution, which is even trickier in terms of syntax is:
+**Set_Pipeline_Parameter_From_Expression**
+/PARAMETER_NAME=SCOTT
+/EXPRESSION=("&::TAG_NAMES&"==" Utility")
+! /AS_INTEGER=TRUE
+**;**
+This forces Visual3D to recognize the strings as strings and the & is treated correctly.
+\\
+=== Get global metrics ===
+Global metrics can be set to a pipeline parameter by setting "GLOBAL" in front of the metric name. More information about expressions can be found [[Visual3D:Documentation:Pipeline:Expressions:Expressions_Overview|here]].
+**Set_Pipeline_Parameter_From_Expression**
+/PARAMETER_NAME=KATIE
+/EXPRESSION=GLOBAL::METRIC::PROCESSED::MASS
+/AS_INTEGER=FALSE
+**;**