//In a paint hook
local AngPos = ent:GetAttachment(ent:LookupAttachment( "head" ))

local CamData = {}
CamData.angles = AngPos.Ang + Angle(0,180,0)
CamData.origin = AngPos.Pos + Vector(0,0,self:GetModelHeight() / 2) + (AngPos.Ang:Forward() * 60)
CamData.x, CamData.y = self:GetPos()
CamData.w = self:GetWide()
CamData.h = self:GetTall()
render.RenderView( CamData )

//my GetModelHeigt function
local min,max = self.CamEnt:WorldSpaceAABB()
local offset=max-min
return offset.z