Mike Horvath <mik### [at] gmailcom> wrote:
>
> Could you provide a sample where the script fails? I tried a +z to -z
> camera direction, as well as a wide angle, and the numbers seemed okay.
>

If you can pull up Norbert's original pristine file, add these test objects to
the scene (they're independent of his code-- they're just origin markers to see
what's going on)...

union{
cylinder{0,.4*x .012} // X
cylinder{0,.4*y .012} // Y
cylinder{0,.4*z .012} // Z
text{ttf "cyrvetic.ttf" "+ X" 0.1, 0 rotate 90*x scale .15
     translate <.4,.03,0>} // " + X"
text{ttf "cyrvetic.ttf" "+ Y" 0.1, 0 scale .15
     translate <-.1,.4,0>} // " + Y"
text{ttf "cyrvetic.ttf" "+ Z" 0.1, 0 rotate 90*x scale .15
     translate <-.1,.03,.45>} // "+ Z"
     translate .32*y
     pigment{rgb <.2,.2,1>}
   }

Now set his x_pos and y_pos variables to...
#declare x_pos = 20;
#declare y_pos = 90;

Now, run his code, with no no other changes. (Note that his camera is facing -z
by default, not the usual +z.) In the render, the 'positive' x-axis direction is
still facing to the right, when it should be to the left. (It's like the render
has been 'mirrored.') He does include a 'mirror' variable within the macro-- a
switch from +1 to -1 -- which will fix that-- but it also flips his on-screen
text (next to the arrow,) so don't use it.

Now, change his camera to a forward-looking one. Try this...
#declare cam_loc = <-.5,1.8,-3>;
#declare lookat  = <.1,0.2,2>;

In this render, the axis markers look correct, the arrow's text looks correct--
but the arrow is actually on the wrong side of the screen now (left to right).
The x_pos of 20 should put it on the left, but it's now on the right.

Most of this behavior requires only minor fixes (some of which I've managed to
figure out, in a quick-and-dirty way) but I'm still testing things.

And I haven't yet taken a look at Thomas's newer code, to see what goodies he
has come up with...

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