When I pass in a value of -0.0f for the “Angle Deg” input into the RotateVectorAroundAxis blueprint function, the output vector is broken. Printing the vector to log reveals that it’s value is “X=-1.#IO Y=-1.#IO Z=-1.#IO”.

I managed to figure it out, hidden in some code I had, there was an edge case where the value I was passing into that multiplication could be equivalent to NAN from math.h, which is “(float)((float)((double)(1e+300) * (double)(1e+300)) * 0.0f)”. It looks like this causes a float overflow. I guess it…

RotateVectorAroundAxis breaks when "Angle Deg" = -0.0f

Development Programming & Scripting Blueprint

janimationd (janimationd) October 6, 2015, 5:23pm 8

See my answer below, I figured it out.