First of all, sorry if my question sounds too basic or even makes no sense. I'm new with game development
I'm working with HPL1Engine, specifically, the lights parts. I need to know the direction in which a spot light emits its light. But the class that represents a spot light, doesn't have any direction vector.
So, I've been reading about lights in 3D engines, and I've detected in the class some other properties that I consider important. Like a projection matrix and angles (FOV and aspect). I'm trying to focus on the projection matrix (here, how the engine calculates it), but I'm not sure if I'm wasting my time.
Again, my goal is to know the direction in which a spot light emits its light (a vector), but I just have this matrix, and many other properties I don't relate with the spot direction calculation.
How could I know this direction from which I have (what the class provides me)?
Many thanks in advance.