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Writer's pictureBaldingWizard
Aug 30, 20191 min read

New Tutorial

I've started on a new tutorial to explain how to get the best of Node Expressions. It's only just getting started so far, but I'll be expanding it to include all the advanced features that are in there waiting to be discovered. Watch this space...

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Tartorius
Tartorius
08 sept 2022

Another question : I am trying to get a basic composite math expression, something like X = Y*(Z+W) and it keeps saying invalid character (I am assuming it's the paranthesis). I am assuming there is the option to do that, but I just couldn't figure it out. Help, please !

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BaldingWizard
BaldingWizard
09 sept 2022
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Oh, I see what’s happened.… When it parses the expression is picks out all of the bits it knows about - such as functions and mathematical operators - and whatever is left it assumes to be variables. In your case, using an invalid function of ‘sqrt(…)’ means it thinks you have a variable named “sqrt(3)” and variables aren’t allowed to contain ‘(‘ or ‘)’ - so the error message is “***variable*** ‘sqrt(3)’ contains non-alphanumeric character”. Now you’ve changed to use ‘**0.5’ for square root it no longer has a problem.

I’ll see about improving the error message so it warns of invalid function name instead of invalid variable name - hopefully that will be clearer.

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Tartorius
Tartorius
08 sept 2022

Hi. Quick question. I've been using your Maths Expression addon and so far I think it is amazing, does exactly what Blender was missing - composite maths expressions. One thing I could not find, however, is the square root expression. I've tried sqr(x), sqrt(x), but it keeps throwing error messages. Any tips, please ?

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Tartorius
Tartorius
08 sept 2022
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cheers !

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