Hi all,

I am generating a set of tiles and I am using the (windows) commandline
to do it. My typical cmd command is:

"c:\Program Files\OpenSCAD\openscad.com" -o stl\tile_6_3.stl -D "x=6" -D
"y=3" cmdline_tile.scad

The cmdline_tile.scad file contains this code:

$fn = 30;
use <tile_module.scad>;
// dQ
midHeight = 38;
slopeN = [-95 / 12 * y, -57 / 12 * x, 32];
tile (slopeN, h = midHeight);

And this produces an error:

WARNING: Ignoring unknown variable 'y', in file cmdline_tile.scad, line 6.
WARNING: undefined operation (number * undefined) in file
cmdline_tile.scad, line 6
WARNING: Ignoring unknown variable 'x', in file cmdline_tile.scad, line 6.
WARNING: undefined operation (number * undefined) in file
cmdline_tile.scad, line 6

And of course the result is empty...

If I add echo before the slopeN= […] assignment, the variables show
themselves to be existent:

echo (x=x, y=y);

which produces this output line:

ECHO: x = 6, y = 3

again followed by the error claiming that variable 'y' is unknown etc.

What is, however, unexplainable for me, is the fact that the command on
last line works, if I build the slope vector inline:

tile (n = [-95 / 12 * y, -57 / 12 * x, 32], h = midHeight);

This does not raise any warning and builds the expected tile. Why? And
why I cannot build the vector and then use it?

(OK, I have a workaround now but I am not happy with the path)

Jan

'-D' adds that text to the end of the file (in memory).

so you get this

$fn = 30;

use <tile_module.scad>;

// dQ

midHeight = 38;

slopeN = [-95 / 12 * y, -57 / 12 * x, 32];

tile (slopeN, h = midHeight);

x=6;y=3;

Try that in the GUI

The magic source is

$fn = 30;

use <tile_module.scad>;

// dQ

midHeight = 38;

x=0; y=0;

slopeN = [-95 / 12 * y, -57 / 12 * x, 32];

tile (slopeN, h = midHeight);

x=6;y=3;

If you want to know why, ask, but I'll answer tomorrow, I have a glass of red calling to me...

From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of Jan Koupil
Sent: Fri, 14 Aug 2020 17:32
To: discuss@lists.openscad.org
Subject: [OpenSCAD] Weird behaviour of commandline parameters

Hi all,

I am generating a set of tiles and I am using the (windows) commandline to do it. My typical cmd
command is:

"c:\Program Files\OpenSCAD\openscad.com" -o stl\tile_6_3.stl -D "x=6" -D "y=3" cmdline_tile.scad

The cmdline_tile.scad file contains this code:

$fn = 30;

use <tile_module.scad>;

// dQ

midHeight = 38;

slopeN = [-95 / 12 * y, -57 / 12 * x, 32];

tile (slopeN, h = midHeight);

And this produces an error:

WARNING: Ignoring unknown variable 'y', in file cmdline_tile.scad, line 6.
WARNING: undefined operation (number * undefined) in file cmdline_tile.scad, line 6
WARNING: Ignoring unknown variable 'x', in file cmdline_tile.scad, line 6.
WARNING: undefined operation (number * undefined) in file cmdline_tile.scad, line 6

And of course the result is empty...

If I add echo before the slopeN = [.] assignment, the variables show themselves to be existent:

echo (x=x, y=y);

which produces this output line:

ECHO: x = 6, y = 3

again followed by the error claiming that variable 'y' is unknown etc.

What is, however, unexplainable for me, is the fact that the command on last line works, if I build
the slope vector inline:

tile (n = [-95 / 12 * y, -57 / 12 * x, 32], h = midHeight);

This does not raise any warning and builds the expected tile. Why? And why I cannot build the
vector and then use it?

(OK, I have a workaround now but I am not happy with the path)

Jan

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