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For functions with multiple return values like pack, only 1 return
value is kept in a list of operations.  It has confused me in the past
as well.  Here's a more straightforward example:

-- will only return 2 values, not #x+1 values
function test(x)
   return unpack(x), 1

Your example with {unpack(x), 1} is the same.  Only the first value
form unpack is kept.  The easiest way to do what you want is:

local vec4 = {unpack(vec3)}
vec4[4] = 1


On Sat, Oct 1, 2011 at 10:25 AM, Thijs Koerselman
<> wrote:
> I feel really stupid for asking this.
> local pos = {unpack({1,2,3}), 4}
> print("pos size ".. #pos)
> I would expect #pos to return 4, but instead its 2. A more real world
> situation would be to convert a vec3 to vec4 like this:
>         local vec4 = {unpack(vec3), 1}
> What the heck am I missing?
> Thijs