koobas.hobune.stream
Unity AddForce Problem (not a bug problem, but a math problem)
Sorry for the lack of details in the title, the reason for that is that I don't know a short way of how to explain the problem I want to solve. Here's some context: I'm making a 3D platformer game where my player is a sphere that rolls and jumps around. I've already got in an orbital camera, the controls work fine and everything, but the method I use to move my player around is AddForce.
Problem:
This becomes a problem when I hold down both the W and the D key, it's applying the same speed unit to both the x and the z axis, which is actually causing my sphere to move faster diagonally rather than laterally. I've included a bit of a diagram at the bottom of what's happening versus what I'm trying to get to happen:
For the purposes of simplicity, let's only add forces of 1 unit. Let the green arrow represent the force being applied. 
Uhm you have to normalize your force vector. Or if you want to have smaller values you may want to use Vector3.ClampMagnitude with a max length of 1f. This will make the vector to be clamped to the length of 1 only if it's larger.
@Bunny83 you always beat me by seconds! Ya this is the better answer though, I'll leave $$anonymous$$e up as an additional random option.
:) I'm sorry but it happens to me all the time as well as i tend to write quite long and detailed answers which often leads to co$$anonymous$$g late to the party ^^.
@Bunny83 Thanks for that information, after thinking about it, I realized this has to be a problem that's been noticed before, so I went searching for an answer, googling "moves faster diagonally" and surely enough, it's been answered. Although, I'm having a bit of a problem with that answer, because (I haven't tested it yet) but wouldn't Vector3.Clamp$$anonymous$$agnitude not only clamp it on the x and z axis, but also on the y axis? How could I exclude that? $$anonymous$$y game utilizes gravity and jumping as a platformer, so I don't want to limit the fall speed. Thanks for your response!
Uhm, wasn't the question about a force vector which you constructed from the input? I didn't suggest to clamp the velocity. Of course when you want to clamp the horizontal velocity you would have to decompose the velocity into a horizontal and vertical part, clamp the horizontal part and combine them back into a single velocity. Though as i said your question was about a force vector.
Sorry, I might not be explaining it properly, I thought that Vector3.Clamp$$anonymous$$agnitude would clamp the velocity, but perhaps I'm wrong. x) I've never really used it, I'll take a look at it on the wiki and try it out in my game and see if I encounter any issues and then go from there. Either way, thanks!
What you should do is detect when there is both Vertical and Horizontal input and then instead do rb.AddForce(0.7071, 0, 0.7071)
@Buckslice Thanks! This helps me exclude velocity resulting from gravity from being clamped, although that doesn't seem like the simplest way to manage it, but I probably will use that until I figure out how to exclude the y from being clamped.
Ya my method is basically manually normalizing it. Not sure exactly how your code is setup, but if you want to normalize but ignore the y component of the vector you could do something like this
float ySave = velocity.y;
velocity.y = 0.0;
velocity.Normalize();
velocity.y = ySave;
