Hi, this is actually an extracurricular topic I'm interested in, so it just barely fits into the Geometry section, sorry.

Anyway,

Apparently there is the formula:

R(t) = R0 + t * Rd , t > 0

Of this, I understand that R0 = [0X, 0Y, 0Z] represents the *O*rigin of the ray, as a point.

Also, Rd = [dX, dY, dZ], meaning the *D*irection of the ray, represented as the direction from the origin to [dX, dY, dZ].

However, I'm stuck at T. What is T, and can this formula be used to solve for, say, z given x and y?

My bountiful gratuity!

YottaFlop