Forums Houdini Indie and Apprentice Matrices in VEX; what does the ampersand with matrices mean?

Matrices in VEX; what does the ampersand with matrices mean?

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Fabrizio123
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For example

void rotate(&m, amount, axis)

I used to know it 6 months ago, I even made a note on it but now I can't find that note.
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animatrix_
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Hi,

It means the argument is passes by reference:
https://pediaa.com/what-is-the-difference-between-pass-by-value-and-pass-by-reference/#:~:text=The%20main%20difference%20between%20pass,parameter%20passes%20to%20the%20function.
Senior FX TD @ Industrial Light & Magic
Get to the NEXT level in Houdini & VEX with Pragmatic VEX! [www.pragmatic-vfx.com]

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tamte
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generally in VEX it just means that that variable will be modified
so your m matrix itself will be rotated, rather than rotated matrix being returned from the function
Tomas Slancik
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Method Studios, NY
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Fabrizio123
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Thanks a lot to both of you for your generous replies.
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