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31 lines
1005 B
Lua
31 lines
1005 B
Lua
local glm_sincos = require 'glm'.sincos
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local glm_rad = require 'glm'.rad
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---Get the relative coordinates of a vector3 based on a heading and offset
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---@overload fun(coords: vector3, heading: number, offset: vector3): vector3
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---@overload fun(coords: vector4, offset: vector3): vector4
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---@param coords vector3 | vector4
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---@param heading number
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---@param offset vector3
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---@return vector3
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function lib.getRelativeCoords(coords, heading, offset)
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offset = offset or heading
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local x, y, z, w = coords.x, coords.y, coords.z, type(heading) == 'number' and heading or coords.w
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local sin, cos = glm_sincos --[[@as fun(n: number): number, number]](glm_rad(w))
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local relativeX = offset.x * cos - offset.y * sin
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local relativeY = offset.x * sin + offset.y * cos
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return coords.w and vec4(
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x + relativeX,
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y + relativeY,
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z + offset.z,
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w
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) or vec3(
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x + relativeX,
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y + relativeY,
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z + offset.z
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)
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end
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return lib.getRelativeCoords
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