in attribute wrangler i have this script :

@P.y = point(1, "P", @ptnum);

so I want to fetch the P attr from other object (connected to input 1). It works as expected but since the P is vector, by default i can only get the 'x' component.

I want to fetch the 2nd component of P (which is y). I tried both of these codes but they're not working :


to make it works , i have to break the script into 2 lines:

What is the problem with those single line scripts ?

The reason it doesn't work in your first one-line examples is that "@P.y" is not an attribute. "@P" is.
If you cast to a vector, you can then get the 'y'.


See: https://www.sidefx.com/docs/houdini/vex/lang.html#variable-casting [www.sidefx.com]

Just to add to the answers above - I believe it's because the "point" function doesn't have a single, predefined return type - it *might* return a vector, or it might return a float or a string, depending on what input you plug in... explicitly casting it as in the above posts means VEX can know in advance that referencing a .y component is valid.

You can still assign directly to @P.y this way: