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--- visual3d:documentation:pipeline:expressions:signal_functions [2024/11/15 19:24] – [Point_Tracked_By_3Points] wikisysop
+++ visual3d:documentation:pipeline:expressions:signal_functions [2025/05/15 16:37] (current) – Added link to new function File_Tag_Exists. wikisysop
@@ Line 5: / Line 5: @@
 ==== Data_Exists ====
-Data_Exists(a) returns 1 if the signal exists.
+**Data_Exists(a)** - returns 1 if the signal exists. This behaviour is similar to the function [[visual3d:documentation:pipeline:expressions:workspace_functions#file_tag_exists|File_Tag_Exists]].
 Example, compute "something" only if the event label RON exists.
@@ Line 258: / Line 258: @@
 **As as aside, for some applications, using only the marker data will result in faster processing and smaller cmz files.**\\
+Example:
+locate a point in the model relative to 3 markers\\
+then track this point in the movement trial
+<code>
+Evaluate_Expression
+/EXPRESSION=Point_Tracked_By_3Points(Point_Relative_To_3Points(MODEL::TARGET::FaceBot, MODEL::TARGET::Shaft4, MODEL::TARGET::Shaft5, MODEL::TARGET::Shaft6),
+ TARGET::ORIGINAL::Shaft4, TARGET::ORIGINAL::Shaft5, TARGET::ORIGINAL::Shaft6)
+/RESULT_TYPES=DERIVED
+/RESULT_FOLDERS=CLUBFACE
+/RESULT_NAME=FaceBot
+;
+</code>
 ==== Snip ====