the texture left bottom coordinate is (0,0)

right top coordinate is (1, 1)

when we get the length of the coordinate vector

Something like this

I expected get this texture when I connect the value to red channel

but when I play with NME i got this

It looks like the value in the center of the circle is 0 , not 1/sqrt(2)

Did I think something wrong？

Babylon.js Node Material Editor