Rotate camera and movement

ILoveFuze

So I have the following code for movement:

r = 0
x = 0
z = 0
loop
   clear()
   c = controls(0)
   r += c.rx
   x += c.lx / 5
   z += -c.ly / 5
   setObjectPos(player, {x, 0, z})
   setCamera({sin(r) * 5 + x, 2, cos(r) * 5 + z}, {x, 1, z})
   drawObjects()
   update()
repeat

But when I turn the camera and move, it won't move based of the cameras rotation (I know why this happens) and I don't know how to make it do that. If any of you have a solution, please tell me. :D

PickleCatStars

I’ve done this but it was a while ago. I shared the blog post I copied from here:
@toxibunny said in Good articles found on the web.:

Here is a nice simple 3rd person camera for 3d stuff. Again, it’s not Fuze specific, but it’s easy enough to use. I just basically copypasted (with very slight changes) the ’move character relative to camera position’ bit for my project, and it worked!

https://www.braynzarsoft.net/viewtutorial/q16390-32-simple-3rd-person-camera

The relevant bit is actually titled ‘move the character in camera space’. If I understand you correctly, that’s the bit you need :)

Gothon

What you need to do is use the facing direction as the basis vector for the vertical and horizontal movements from the analog stick.

x += (c.lx * cos(r) - c.ly * sin(r)) / 5
z += (-c.lx * sin(r) - c.ly * cos(r)) / 5

You can avoid a big formula like the one above if you represent the position and facing direction as vectors:

r = 0
p = {0, 0, 0} // Position vector
loop
    clear()
    c = controls(0)
    r += c.rx
    f = {sin(r), 0, cos(r)} // facing vector
    pf = {f.z, 0, -f.x} // Perpendicular to facing
    p += (f * -c.ly + pf * c.lx) / 5
    
    setObjectPos(player, p)
    setCamera(f * 5 + p + {0, 2, 0}, p + {0, 1, 0})
    drawObjects()
    update()
repeat

Also see https://fuzearena.com/help/view/3D Camera Movement

PickleCatStars

Woah. So was all that stuff I did just a waste of time?

Gothon

No it wasn't a waste. The tutorial you posted is complimentary; it contains useful hints, techniques for damping, and a discussion of the character displayed in 3rd person view. The tutorial in the Fuze help is only about a first person camera, and my post was just showing the calculations to adapt the provided program without much explanation. All of these together should contribute to a better understanding of the problem and its solution.

PickleCatStars

I noticed that in gothon’s code, there’s

pf = {f.z, 0, -f.x}

Whereas in the blog post I linked, she has

Camright = (-camForward.z, 0.0f, camForward.x)

I’m guessing the difference in which ones are reversed with the - sign is something to do with ‘right-handed’ or ‘left-handed’ coordinate system.

This is a thing which tripped me up/confused me for a while. Just wanted to highlight it.