Creating a default value other than 'None' in Evaluate DAT

General TouchDesigner Discussion
1

Using an Evaluate DAT fed by a Table to control xyz coordinates of my Geo COMP.
Evaluate > Output is set to Evaluate.

My problem is that I need to set some default x,yz value(s) when evaluate is ‘None’

Can this be done somehow in the Evaluate DAT or do I need to modify the Table expression feeding the DAT?

ExpressionDAT_None

2

You can add a one line if-statement into your eval to give a location that’s default. It’d be something like:

val if val != None else defaultVal
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3

Thanks Matthew. working.
BTW, really nice instancing demo! GitHub - mir-lab/touchdesigner-instancing-examples

4

Thanks @art3mis - they were really fun to put together. I just need to finish all the writing that goes along with them.

5

val is not None

is slightly more efficient and the more common way to write this. Equality is always slower to test than “is”.

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6

huh - I did not know that @Ivan. Pro tip there.

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