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--- software:touch_designer [2025/12/08 21:33] – [Useful tips] mh
+++ software:touch_designer [2025/12/09 17:43] (current) – [Useful Python Expressions] mh
@@ Line 162: / Line 162: @@
   * Organizes complex CHOP data streams.
+=== Referencing a parameter - Dynamic links ===
+  * Select the CHOP and toggle the display with the **+** in the bottom right
+  * Select the TOP to link to parameter
+  * Drag & drop from the CHOP into the parameter
+  * Select Reference type (Most of the time it's CHOP Reference)
+You can also drag an entire CHOP into a CHOP to TOP operator to reference it.
+Alternatively, you can right click in the parameter window for the CHOP → Copy Parameter and then in the destination parameter right click → Paste Reference
+----
 ==== Resolution TOP ====
   * Drop resolution early to speed up heavy FX.
@@ Line 170: / Line 183: @@
   * ''absTime.seconds'' → time in seconds.
   * ''me.digits'' → returns numeric suffix of OP name. Combine with math expression (e.g. ''* -5'') to increment or decrement a parameter as you copy/paste (useful for **Cache Select** building a trail effect for example).
+  * ''me.parent().width'' or ''.height'' → resolution width/height of the parent comp
@@ Line 186: / Line 200: @@
   * Useful for simulations, particles, reactive systems.
+This converts video streams into usable data for interactivity.
 ===== Common Techniques =====
@@ Line 217: / Line 232: @@
-===== Rendering =====
@@ Line 223: / Line 238: @@
 ===== Useful Tools =====
-==== Optical Flow ====
-This operator calculates the motion vectors inside a video stream and codes it to the Red and Green channels.
-This converts video streams into usable data for interactivity.
-The data can be plugged into particle systems, fluid systems or any other creative content that accept data as input to react upon.
 ==== Output ====