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local M = {}
function M.lerp(a,b,t) return (1-t)*a + t*b end
function M.smoothstep(x)
if x<0 then return 0 end
if x>1 then return 1 end
return x*x*(3 - 2*x)
end
function M.slerp(a,b,t) return M.lerp(a,b,M.smoothstep(t)) end
function M.sign(x)
if x == 0 then return 0
elseif x < 0 then return -1
elseif x > 0 then return 1
end
end
function M.clamp(x,minv,maxv)
return math.min(math.max(x,minv),maxv)
end
return M
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