assuming 3D space. i have an object moving in a fairly arbitrary direction. Say it's being fired in an arc, and it hits a wall. What i want to find out is, how much of that object's velocity is "toward" the wall. Ie, if i define a direction from the object to the wall, how do i calculate its velocity in that direction i could swear i've done this before, but i have only vague inklings left. is vector projection what i'm looking for?