Cannot access attribute of point inside the wrangle in which it is created

[JH12]

Wondering why this behavior exists:

I create a bunch of points in a Detail wrangle using this code.  After the loop, when trying to print the value of any point attribute, it always returns {0,0,0}.
If I wire in a second wrangle and try to print the value using the same last two lines of code, the P vector prints correctly.
What is the logic behind this? 

 

int i;
for (i=0; i<100; i++){
float x = rand(i);
float y = rand(i*2);
float z = rand(i*3);
vector v = set(x,y,z);
addpoint(geoself(), v);
}

vector val = point(geoself(), "P", 5);
printf("%g", val);

 

Edited July 14, 2022 by JH12

[animatrix]

Hi,

You can't access attributes of a point you just created inside the same wrangle node.

[JH12]

Thanks, and why is this?

[animatrix]

Because the geometry creation happens after the entire VEX code is executed and the result is finalized as the output of that particular wrangle. So you don't have those geometry actually created while you are still in the same VEX kernel, but after. That's why you can't use them in the same code that used to create them.

[JH12]

Thanks for the explanation

[carthick]

On 7/14/2022 at 3:49 PM, JH12 said:

Thanks, and why is this?

i was stumped for while when i first ran into this.. think of it like this..

 

your wrangle works on input 0. and input 0 doesn't have the points... you are querying . as simple as that .