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I have the following code which is supposed to generate a parabola and 5
toroidal rings along the parabola's shape. However, only 3 of the 5 tori
are showing up. For the life of me I cannot figure out why. Where did I
make a mistake?
union
{
#local p_scale = 256;
#local wire_radius = 8;
#local wire_color = color rgb x+y;
#local x_old = 0;
#local z_old = 0;
#for (t_cnt, 0.1, 5, 0.1)
#local x_new = p_scale/4 * t_cnt * 2;
#local z_new = p_scale/4 * pow(t_cnt, 2);
cylinder {<+x_old,0,z_old>, <+x_new,0,z_new>, wire_radius}
cylinder {<-x_old,0,z_old>, <-x_new,0,z_new>, wire_radius}
#if (mod(abs(t_cnt), 1) = 0)
torus
{
x_new, wire_radius
rotate +x * 90
translate +z * z_new
}
#end
#local x_old = x_new;
#local z_old = z_new;
#end
pigment {wire_color}
}
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On 01/09/2016 10:09 AM, Mike Horvath wrote:
> I have the following code which is supposed to generate a parabola and
5
> toroidal rings along the parabola's shape. However, only 3 of the 5 tor
i
> are showing up. For the life of me I cannot figure out why. Where did I
> make a mistake?
>
> #if (mod(abs(t_cnt), 1) = 0)
My bet would be floating point rounding errors and this line: due to
rounding errors, t_cnt will take values like 2.9999999999 or 3.000000001
which will cause the test to fail. Try to loop on integers (from 1 to
50) and use t_cnt/10 when computing coordinates.
Jerome
--
mailto:jeb### [at] free fr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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On 1/9/2016 5:57 AM, Jérôme M. Berger wrote:
> On 01/09/2016 10:09 AM, Mike Horvath wrote:
>> I have the following code which is supposed to generate a parabola and 5
>> toroidal rings along the parabola's shape. However, only 3 of the 5 tori
>> are showing up. For the life of me I cannot figure out why. Where did I
>> make a mistake?
>>
>> #if (mod(abs(t_cnt), 1) = 0)
>
> My bet would be floating point rounding errors and this line: due to
> rounding errors, t_cnt will take values like 2.9999999999 or 3.000000001
> which will cause the test to fail. Try to loop on integers (from 1 to
> 50) and use t_cnt/10 when computing coordinates.
>
> Jerome
>
That's a good idea, thanks!
Mike
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