Hello,
I lately tried programming a Blade-Ball / Death-Ball like game. I tried using a Bezier Curve. The curve also werks perfectly fine but when i move away or to the ball, the ball speeds up or slows down. How can i fix that?
t += dt / (startPos - RootPos).Magnitude * speed
Clone.CFrame = CFrame.new(CurveModule:quadBezier(t, startPos, Vector3.new(10, 20, 10), RootPos)) --Vecotr3 is just a Place holder
local function lerp(t, a, b)
return a + (b - a) * t
end
function module:quadBezier(t, p0, p1, p2)
local l1 = lerp(t, p0, p1)
local l2 = lerp(t, p1, p2)
local quad = lerp(t, l1, l2)
return quad
end
The code you are using seems to work fine in most cases, but not in this one. The whole problem derivates from t += dt / (startPos - RootPos).Magnitude * speed
(startPos - RootPos).Magnitude is just the straight line distance between start and end, not the true Bezier curve length. Since Bezier curves bend, the actual length can be longer or shorter depending on the control point, so advancing t linearly doesn’t produce a constant speed at all.
I can’t currently think of a solution for this though as I’m not that great at Bezier curves, but I hope that you at least have a clearer idea of what the problem is.
That only considers the straight-line distance from startPos to RootPos, but your Bezier curve is longer than the straight line..
a quick untested guess
local samples = 50
local points, lengths = {}, {0}
for i = 0, samples do
points[i] = module:quadBezier(i/samples, startPos, Vector3.new(10,20,10), RootPos)
end
local totalLength = 0
for i = 1, samples do
local seg = (points[i] - points[i-1]).Magnitude
totalLength += seg
lengths[i] = totalLength
end
local function tFromDistance(d)
for i = 1, samples do
if d <= lengths[i] then
local r = (d - lengths[i-1]) / (lengths[i] - lengths[i-1])
return ((i-1) + r)/samples
end
end
return 1
end
local distance = 0
task.spawn(function()
while distance <= totalLength do
distance += speed * task.wait()
local t = tFromDistance(distance)
Clone.CFrame = CFrame.new(module:quadBezier(t, startPos, Vector3.new(10,20,10), RootPos))
end
end)
