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51 lines
2 KiB
Lua
51 lines
2 KiB
Lua
local camera = require('openmw.camera')
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local self = require('openmw.self')
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local settings = require('openmw.settings')
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local util = require('openmw.util')
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local doubleStepLength = settings._getFloatFromSettingsCfg('Camera', 'head bobbing step') * 2
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local stepHeight = settings._getFloatFromSettingsCfg('Camera', 'head bobbing height')
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local maxRoll = math.rad(settings._getFloatFromSettingsCfg('Camera', 'head bobbing roll'))
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local effectWeight = 0
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local totalMovement = 0
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local M = {
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enabled = settings._getBoolFromSettingsCfg('Camera', 'head bobbing')
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}
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-- Trajectory of each step is a scaled arc of 60 degrees.
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local halfArc = math.rad(30)
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local sampleArc = function(x) return 1 - math.cos(x * halfArc) end
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local arcHeight = sampleArc(1)
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function M.update(dt, smoothedSpeed)
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local speed = self:getCurrentSpeed()
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speed = speed / (1 + speed / 500) -- limit bobbing frequency if the speed is very high
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totalMovement = totalMovement + speed * dt
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if not M.enabled or camera.getMode() ~= camera.MODE.FirstPerson then
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effectWeight = 0
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return
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end
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if self:isOnGround() then
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effectWeight = math.min(1, effectWeight + dt * 5)
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else
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effectWeight = math.max(0, effectWeight - dt * 5)
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end
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local doubleStepState = totalMovement / doubleStepLength
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doubleStepState = doubleStepState - math.floor(doubleStepState) -- from 0 to 1 during 2 steps
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local stepState = math.abs(doubleStepState * 4 - 2) - 1 -- from -1 to 1 on even steps and from 1 to -1 on odd steps
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local effect = sampleArc(stepState) / arcHeight -- range from 0 to 1
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-- Smoothly reduce the effect to zero when the player stops
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local coef = math.min(smoothedSpeed / 300, 1) * effectWeight
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local zOffset = (0.5 - effect) * coef * stepHeight -- range from -stepHeight/2 to stepHeight/2
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local roll = ((stepState > 0 and 1) or -1) * effect * coef * maxRoll -- range from -maxRoll to maxRoll
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camera.setFirstPersonOffset(camera.getFirstPersonOffset() + util.vector3(0, 0, zOffset))
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camera.setRoll(camera.getRoll() + roll)
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end
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return M
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