|
 |
Long time, no see, Mr. K :)
I hope you are personally well, and professionally successful.
Now with
https://news.povray.org/povray.general/message/%3Cweb.682bc388985098ff1f9dae3025979125%40news.povray.org%3E/#%3Cweb.682
bc388985098ff1f9dae3025979125%40news.povray.org%3E
You don't need the whole #switch block below to handle individual vector sizes.
just
#declare SV = VectorDimTest (v0);
#debug concat("<", vstr(2, SV, ", ", 0, -1), ">")
>
> #macro PrintSCalarOrVector(Dim, SV)
>
> #switch (Dim)
> #case (1)
> #debug str(SV, 0, -1)
> #break
> #case (2)
> #debug concat("<", vstr(2, SV, ", ", 0, -1), ">")
> #break
> #case (3)
> #debug concat("<", vstr(3, SV, ", ", 0, -1), ">")
> #break
> #case (4)
> #debug concat("<", vstr(4, SV, ", ", 0, -1), ">")
> #break
> #case (5)
> #debug concat("<", vstr(5, SV, ", ", 0, -1), ">")
> #break
> #else
> #error "Not a valid vector dimension"
> #end // switch
>
> #end // macro PrintSCalarOrVector
Also, when I stated that i couldn't change Vector.z, I meant by directly
addressing it, like you're doing below with array elements.
I can't say #declare Vector.z = NewValue.
And the awkwardness really kicks in when I'm trying to create a macro like
#macro PermuteVector (SV)
where I just want to make any size vector on the fly and have the result of the
macro be a vector of size SV. Because it is NOT like working with arrays.
I started off by doing
#local V = array {<1, 0, 0, 0, 0>, <0, 1, 0, 0, 0>, <0, 0, 1, 0, 0>, <0, 0, 0,
1, 0>, <0, 0, 0, 0, 1>};
#local Vector = <0, 0, 0, 0, 0>;
to "address" the individual components (in)directly, but now I'm stuck not
knowing how to take <1, 2, 3, 0, 0> and convert it to <1, 2, 3>.
I would like a simple method to MAKE vectors of an arbitrary (allowed) size,
just like vstr () PRINTS vectors of an arbitrary size.
#declare MyVector = mstr (...)
This sort of hearkens back to the epic dot notation thread where I suggested
vec.n where n = 1...5 as a valid syntax (though that still wouldn't solve the
problem, given the inability to use those as an LValue)
Making a vector from array elements requires a lot of hands-on, fussy, one-off
coding for specially constructing each individual size of vector. POV-Ray
should be better than that.
- BW
> #macro CreateScalarOrVector(ValueArray)
>
> #local Dim = dimension_size(ValueArray, 1);
> #switch (Dim)
> #case (1)
> #local SV =
> ValueArray[0]
> ;
> #break
> #case (2)
> #local SV =
> <
> ValueArray[0],
> ValueArray[1]
> >
> ;
> #break
> #case (3)
> #local SV =
> <
> ValueArray[0],
> ValueArray[1],
> ValueArray[2]
> >
> ;
> #break
> #case (4)
> #local SV =
> <
> ValueArray[0],
> ValueArray[1],
> ValueArray[2],
> ValueArray[3]
> >
> ;
> #break
> #case (5)
> #local SV =
> <
> ValueArray[0],
> ValueArray[1],
> ValueArray[2],
> ValueArray[3],
> ValueArray[4]
> >
> ;
> #break
> #else
> #error "Not a valid vector dimension"
> #end // switch
>
> SV
>
> #end // macro CreateScalarOrVector
Post a reply to this message
|
|
