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Boundary Detection and Position Limiting - Code in Description - Another TouchDesigner Tutorial

The Python code used in this tutorial is located below the video timestamps in this description. In this video, we’ll continue to look at basic video game functionality within TouchDesigner by creating a boundary detection and position limiting system for simple 2D geometry. We’ll use the system to restrict the movement of a red square based on the color values of a background image. The end result will be somewhat reminiscent of the Atari 2600 game “Adventure”. We will be using the Speed CHOPs for positioning the red square, and the TOP to CHOP to retrieve RGB color information at the edges of the square. We’ll send this color information into a CHOP Execute DAT, which will use Python code to set position limits within the Speed CHOPs. As I mention in the video, this method of boundary detection has its limitations – you will run into occasional glitches. However, I think the technique is a good illustration of what can be accomplished with CHOPs and simple Python code. —————— 00:00 Intro / Network Overview 03:38 Building the TOP Network - Rectangle TOP 05:03 Noise TOP for Background 07:30 Building the CHOP Network - Positioning System 09:02 Y Positioning Branch 11:28 X Positioning Branch 13:27 Applying Position Values 16:14 Boundary Detection Intro 17:05 TOP to CHOP, UV Coordinates 22:45 Top Boundary Detection 26:32 Bottom, Left and Right Boundary Detection 30:42 Merging CHOPs 31:37 CHOP Execute DAT 32:31 Python Code: Setting + Resetting Boundaries in All Directions 48:57 Closing Comments + Outro —————— Code used within CHOP Execute DAT (make sure you add the tab spacing from the video): if val == 1: if channel.name == 't': op('speed1').par.max = op('posNull')['yPos'] elif channel.name == 'b': op('speed1').par.min = op('posNull')['yPos'] elif channel.name == 'r': op('speed2').par.max = op('posNull')['xPos'] elif channel.name == 'l': op('speed2').par.min = op('posNull')['xPos'] else: op('speed1').par.max = 0.5 op('speed1').par.min = -0.5 op('speed2').par.max = 0.5 op('speed2').par.min = -0.5 —————— If you have any questions as you implement this technique, feel free to reach out. —————— This is the second video in a new series called “Another TouchDesigner Tutorial”. Check back soon for new content. IG: @jackdilaura   / jackdilaura