local pos = there
local emitter = ParticleEmitter(vector_origin)

local function Think()
    local particle = emitter:Add("sprites/light_glow02_add", pos)

    -- movement
    particle:SetVelocity(Vector(math.Rand(-1, 1), math.Rand(-1, 1), math.Rand(5, 50)))
    particle:SetAirResistance(0)
    particle:SetGravity(physenv.GetGravity())

    particle:SetCollide(true)
    particle:SetBounce(0.2)

    -- appearance
    particle:SetColor(255, 255, 255)

    particle:SetStartAlpha(255)
    particle:SetEndAlpha(0)

    particle:SetStartSize(0)
    particle:SetEndSize(10)

    particle:SetDieTime(1)
end

hook.Add("Think", "particle_test", Think)

--[[
    number particle:GetAirResistance()
    number particle:GetAngles()
    number particle:GetAngleVelocity()
    number particle:GetBounce()
    Color particle:GetColor()
    number particle:GetDieTime()
    number particle:GetEndAlpha()
    number particle:GetEndLength()
    number particle:GetEndSize()
    Vector particle:GetGravity()
    Vector particle:GetLifeTime()
    Vector particle:GetPos()
    number particle:GetRollDelta()
    number particle:GetRoll()
    number particle:GetStartAlpha()
    number particle:GetStartLength()
    number particle:GetStartSize()
    Vector particle:GetVelocity()
    nil particle:SetAirResistance(number)
    nil particle:SetAngles(number)
    nil particle:SetAngleVelocity(number)
    nil particle:SetBounce(number)
    nil particle:SetCollideCallback(function(particle))
    nil particle:SetCollide(boolean)
    nil particle:SetColor(number, number, number)
    nil particle:SetDieTime()
    nil particle:SetEndAlpha(number)
    nil particle:SetEndLength(number)
    nil particle:SetEndSize(number)
    nil particle:SetGravity(Vector)
    nil particle:SetLifeTime(number)
    nil particle:SetLighting(boolean)
    nil particle:SetNextThink(number)
    nil particle:SetPos(Vector)
    nil particle:SetRollDelta(number)
    nil particle:SetRoll(number)
    nil particle:SetStartAlpha(number)
    nil particle:SetStartLength(number)
    nil particle:SetStartSize(number)
    nil particle:SetThinkFunction(function(particle))
    nil particle:SetVelocityScale(number)
    nil particle:SetVelocity(Vector)
    nil particle:VelocityDecay(number) -- ??
]]