starlit  Diff

Differences From Artifact [54a7601a0f]:

• File mods/vtlib/math.lua — part of check-in [467a75e0dc] at 2024-05-03 15:31:29 on branch trunk — genericize impacts (user: lexi, size: 3876) [annotate] [blame] [check-ins using]

To Artifact [3edc02f291]:

• File mods/vtlib/math.lua — part of check-in [9d4ddb7701] at 2024-05-04 02:18:17 on branch trunk — fix colors, add grass (user: lexi, size: 4081) [annotate] [blame] [check-ins using]

    69     69   		end
    70     70   	end
    71     71   
    72     72   	return string.format("%s%s", val, unit)
    73     73   end
    74     74   
    75     75   function fn.lerp(t, a, b) return (1-t)*a + t*b end
           76  +function fn.gradient(grad, pos)
           77  +	local n = #grad
           78  +	if n == 1 then return grad[1] end
           79  +	local op = pos*(n-1)
           80  +	local idx = math.floor(op)
           81  +	local t = op-idx
           82  +	return fn.lerp(t, grad[1 + idx], grad[2 + idx])
           83  +end
    76     84   
    77     85   function fn.trim(fl, prec)
    78     86   	local fac = 10^prec
    79     87   	return math.floor(fl * fac) / fac
    80     88   end
    81     89   
    82     90   function fn.sign(v)