POV-Ray : Newsgroups : povray.animations : Drawing lines... Server Time29 Feb 2024 19:05:56 EST (-0500)
 Drawing lines... (Message 1 to 4 of 4)
 From: kurtz le pirate Subject: Drawing lines... Date: 12 Oct 2019 11:15:09 Message: <5da1edfd\$1@news.povray.org>
Hello,

I have a really stupid question.

I want to draw a line (a cylinder in fact), between two points in a
"gradual way". Let us take two points A and B separated by a distance
DIST and trying to do :

delta = 0
while (delta < DIST)
draw cylinder from A to A+delta
increment delta
end

And the 'last' cylinder is draw from A to B.

I'm lost between 'vnormalize', 'vtransform' and 'reorient' :(
Probably very easy, but I'm ditching.

--
Kurtz le pirate
Compagnie de la Banquise
 From: Bald Eagle Subject: Re: Drawing lines... Date: 12 Oct 2019 12:05:01 Message:
kurtz le pirate <kur### [at] gmailcom> wrote:
> Hello,
>
> I have a really stupid question.
>
> I want to draw a line (a cylinder in fact), between two points in a
> "gradual way". Let us take two points A and B separated by a distance
> DIST and trying to do :
>
> delta = 0
> while (delta < DIST)
>    draw cylinder from A to A+delta
>    increment delta
> end
>
> And the 'last' cylinder is draw from A to B.
>
>
> I'm lost between 'vnormalize', 'vtransform' and 'reorient' :(
> Probably very easy, but I'm ditching.
>
>
> --
> Kurtz le pirate
> Compagnie de la Banquise

You want something along the lines of:

1. calculate the distance D between the points.
2. normalize the vector P (P2 - P1)
3. #for (M, 0, D, StepSize)
cylinder {0, P*M, LineWidth translate P1}
#end
 From: jr Subject: Re: Drawing lines... Date: 12 Oct 2019 14:25:01 Message:
hi,

kurtz le pirate <kur### [at] gmailcom> wrote:
> Hello,
>
> I have a really stupid question.
>
> I want to draw a line (a cylinder in fact), between two points in a
> "gradual way". Let us take two points A and B separated by a distance
> DIST and trying to do :
>
> delta = 0
> while (delta < DIST)
>    draw cylinder from A to A+delta
>    increment delta
> end
>
> And the 'last' cylinder is draw from A to B.
>
> I'm lost between 'vnormalize', 'vtransform' and 'reorient' :(
> Probably very easy, but I'm ditching.

couldn't do it myself (haven't the math) but think that the distribution file
"scenes/animations/vect1/vect1.pov" contains the info you're after.

regards, jr.
 From: m@b Subject: Re: Drawing lines... Date: 4 Oct 2020 23:09:00 Message: <5f7a8e4c\$1@news.povray.org>
On 12/10/2019 23:15, kurtz le pirate wrote:
> Hello,
>
> I have a really stupid question.
>
> I want to draw a line (a cylinder in fact), between two points in a
> "gradual way". Let us take two points A and B separated by a distance
> DIST and trying to do :
>
> delta = 0
> while (delta < DIST)
>    draw cylinder from A to A+delta
>    increment delta
> end
>
> And the 'last' cylinder is draw from A to B.
>
>
> I'm lost between 'vnormalize', 'vtransform' and 'reorient' :(
> Probably very easy, but I'm ditching.
>
>

#declare A = <-2,1,-0.5>;
#declare B = < 3,3, 0.5>;
#declare C = B*clock + A*(1-clock) + <0,0,0.00001>; // Or declare a
sub-clock

sphere{A,0.2 pigment{rgb<1,0,0>}}
sphere{B,0.2 pigment{rgb<0,0,1>}}

cylinder{A,C,0.1 pigment{rgb<0,1,0>}}