Hi, I’m trying to clean up my script using an expression. But it seems the format is not right.
Sqrt(1−u²(1−(n⋅i)²))n+u(i−(n⋅i)n)
Here the formula i want to implement
I think you can’t just omit the multiplication signs.
Sorry, I cannot post an asterix sign here. the Error I get is: Syntax error: Invalid expression. (1519)
Use the </> code tag? Please show us what worked? This doesn’t:
Sqrt(1−u²*[1−(n•i)²])*n+u*[i−(n•i)*n]
“n1” is a new variable, not the same thing as “n•i”. (Dot product)
Neither is “n*i”. Still a mystery to me?
This worked for me
Using </> code syntax:
(Sqrt(1-u²*(1-(n*i)²)))*(n+(u*(i-(n*i)*n)))
Yes, it works for the expression but is it the same as the formula you want to implement?
It doesn’t look the same to me. And what about the unitize ([]) and dot product (•) elements?
I started to implement the formula (as I understand it) with components and quickly encountered an error at 1-(n•i)² (OOPS! I used XProd instead of DProd - but then unitize fails?)
expression_2022Oct31b.gh (10.0 KB)
Guess your right, I’ll also try do deconstruct it will individual components and see if it’s a match.
I want to replicate Snell’s Law formula and I with this expression I at least get the same output when I compare it to the Refract component in Mosquito plugin.