 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
HelveticaFanatic wrote:
> How can I make an animation of a train that follows curves and elevation? Is
> there anyway to lay track on it, either?
>
> Thanks.
>
>
Splines are the way to go like 'Reactor' said.
I would also say start first with the height field. I have a series of
programs for making them.(written for win98) One of witch uses contour
lines to make a height field, One to manipulate height fields and One to
place things on them.
They are here:
http://leroywhetstone.s5.com
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
OH! If you do use any of those programs let me know how they worked for you.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Leroy Whetstone <lrw### [at] joplin com> wrote:
> HelveticaFanatic wrote:
> > How can I make an animation of a train that follows curves and elevation? Is
> > there anyway to lay track on it, either?
> >
> > Thanks.
> >
> >
>
> Splines are the way to go like 'Reactor' said.
> I would also say start first with the height field. I have a series of
> programs for making them.(written for win98) One of witch uses contour
> lines to make a height field, One to manipulate height fields and One to
> place things on them.
> They are here:
> http://leroywhetstone.s5.com
Is the height field just for the landscape? Splines can go up and down, too, so
I assume that I should use that. This is a subway, so I think that there
wouldn't be height fields, right?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
HelveticaFanatic wrote:
>
> Is the height field just for the landscape? Splines can go up and down, too, so
> I assume that I should use that. This is a subway, so I think that there
> wouldn't be height fields, right?
>
>
Yea! Your right! When I thought of a train I though of wide open spaces
with smoke blowing as it clumb up a mountain.
But if your doing a subway Splines are better!
I used a 'sphere sweep' for a tunnel in my animation 'Free Knight Out'
http://www.irtc.org/anims/2002-07-15.html
Have Fun!
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"HelveticaFanatic" <nomail@nomail> wrote:
> How can I make an animation of a train that follows curves and elevation? Is
> there anyway to lay track on it, either?
>
> Thanks.
Is there an easy method for regulating the spacing? In other words...
I always use 1 foot scales for my coordinates for ease in designing and
visualizing, and I need to accelerate the train and keep it going at a smooth
speed. This would necessitate the float for each vector in the spline to be how
many feet from the end of the track. Is there a way to follow the spline by
length along the spline on the clock value? I'm thinking that I just label all
key points as 1, 2, 3, ..., then use a small program to determine the distances
between the key points (make small subdivisions and Pythagorean theorem, add it
up), then output it to a file, change the 1, 2, 3 to the feet? Or is there a
macro for this or some feature all ready?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"HelveticaFanatic" <nomail@nomail> wrote:
> How can I make an animation of a train that follows curves and elevation? Is
> there anyway to lay track on it, either?
>
> Thanks.
Right now mostly doing station design work but playing with the splines.
I coded this and got a tunnel:
....
#declare Train_Path = spline {
cubic_spline
-2, <0, 0, -10>,
-1, <0, 0, -5>,
0, <0, 0, 0>,
250, <0, 0, 250>,
300, <30, 0, 290>,
350, <60, 0, 330>,
600, <60, 0, 580>,
601, <60, 0, 590>,
602, <60, 0, 600>
}
#declare Counter = 0;
#while(Counter <= 600)
object { Tunnel Spline_Trans(Train_Path, Counter, y, 0.1, 0) }
#declare Counter = Counter + 0.0625;
#end
But it's a very sad tunnel:
http://www.flickr.com/photos/helveticafanatic/2681282339/
What is wrong? Do I need more keypoints or something?
In tunnel planning, though, I should draw it on graph paper and find the key
points, right?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"HelveticaFanatic" <nomail@nomail> wrote in message
news:web.4881a293729c10115f60ef1e0@news.povray.org...
> "HelveticaFanatic" <nomail@nomail> wrote:
>> How can I make an animation of a train that follows curves and elevation?
>> Is
>> there anyway to lay track on it, either?
>>
>> Thanks.
>
> Is there an easy method for regulating the spacing? In other words...
> I always use 1 foot scales for my coordinates for ease in designing and
> visualizing, and I need to accelerate the train and keep it going at a
> smooth
> speed. This would necessitate the float for each vector in the spline to
> be how
> many feet from the end of the track. Is there a way to follow the spline
> by
> length along the spline on the clock value? I'm thinking that I just label
> all
> key points as 1, 2, 3, ..., then use a small program to determine the
> distances
> between the key points (make small subdivisions and Pythagorean theorem,
> add it
> up), then output it to a file, change the 1, 2, 3 to the feet? Or is there
> a
> macro for this or some feature all ready?
>
The 'vlength' function calculates the length of a vector, so you can
subtract the coordinates of one position from the coordinates of another,
then use vlength to find the distance between them (in POV-Ray units). It's
generally best to avoid writing to files if you can because there's usually
a performance penalty to pay.
The following example is a complete test scene file. Although it doesn't
contain a camera or objects it writes debug messages into the message
stream. Note that the second test on the #while loop is just to avoid
infinite loops in case you set DistanceTravelled to a length that takes you
off the end of the spline. In your animation you would define
DistanceTravelled based on the clock and your acceleration profile. The very
short #while loop ends when SplineIndex holds the value you seek. You can
increase the accuracy as necessary by reducing the value of Increment.
#declare YourSpline = spline {
cubic_spline
-.25, <0,0,-1>
0.00, <2,0,0>
1.00, <1,0,2>
1.25, <0,0,1>
}
#declare SplineEnd = 1;
#declare DistanceTravelled = 20;
#declare Increment = 0.1;
#declare CumulativeDistance = 0;
#declare SplineIndex = 0;
// Loop through the spline for the required distance
#while (CumulativeDistance < DistanceTravelled & SplineIndex < SplineEnd)
#declare CumulativeDistance =
CumulativeDistance+vlength(YourSpline(SplineIndex+Increment)-YourSpline(SplineIndex));
#declare SplineIndex = SplineIndex + Increment;
// Write some messages to the message stream
#debug concat("SplineIndex: ",str(SplineIndex,3,3),"\n")
#debug concat("CumulativeDistance: ",str(CumulativeDistance,3,3),"\n")
#debug concat("Position Vector:
",vstr(3,YourSpline(SplineIndex),",",3,3),"\n\n")
#end
Chris B.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Chris B" <nom### [at] nomailcom> wrote in message
news:4881bcdf@news.povray.org...
>
> "HelveticaFanatic" <nomail@nomail> wrote in message
> news:web.4881a293729c10115f60ef1e0@news.povray.org...
>> "HelveticaFanatic" <nomail@nomail> wrote:
>>> How can I make an animation of a train that follows curves and
>>> elevation? Is
>>> there anyway to lay track on it, either?
>>>
>>> Thanks.
>>
>> Is there an easy method for regulating the spacing? In other words...
>> I always use 1 foot scales for my coordinates for ease in designing and
>> visualizing, and I need to accelerate the train and keep it going at a
>> smooth
>> speed. This would necessitate the float for each vector in the spline to
>> be how
>> many feet from the end of the track. Is there a way to follow the spline
>> by
>> length along the spline on the clock value? I'm thinking that I just
>> label all
>> key points as 1, 2, 3, ..., then use a small program to determine the
>> distances
>> between the key points (make small subdivisions and Pythagorean theorem,
>> add it
>> up), then output it to a file, change the 1, 2, 3 to the feet? Or is
>> there a
>> macro for this or some feature all ready?
>>
>
> The 'vlength' function calculates the length of a vector, so you can
> subtract the coordinates of one position from the coordinates of another,
> then use vlength to find the distance between them (in POV-Ray units).
> It's generally best to avoid writing to files if you can because there's
> usually a performance penalty to pay.
>
> The following example is a complete test scene file. Although it doesn't
> contain a camera or objects it writes debug messages into the message
> stream. Note that the second test on the #while loop is just to avoid
> infinite loops in case you set DistanceTravelled to a length that takes
> you off the end of the spline. In your animation you would define
> DistanceTravelled based on the clock and your acceleration profile. The
> very short #while loop ends when SplineIndex holds the value you seek. You
> can increase the accuracy as necessary by reducing the value of Increment.
>
> #declare YourSpline = spline {
> cubic_spline
> -.25, <0,0,-1>
> 0.00, <2,0,0>
> 1.00, <1,0,2>
> 1.25, <0,0,1>
> }
I meant to say:
#declare YourSpline = spline {
cubic_spline
-.25, <0,0,-1>
0.00, <20,0,0>
1.00, <1,0,20>
1.25, <0,0,1>
}
The other example illustrates the scenario where the distance is greater
than the length of the spline :-)
Chris B.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"HelveticaFanatic" <nomail@nomail> wrote in message
news:web.4881a898729c10115f60ef1e0@news.povray.org...
> "HelveticaFanatic" <nomail@nomail> wrote:
>> How can I make an animation of a train that follows curves and elevation?
>> Is
>> there anyway to lay track on it, either?
>>
> I coded this and got a tunnel:
> ....
> #declare Train_Path = spline {
> cubic_spline
> -2, <0, 0, -10>,
> -1, <0, 0, -5>,
> 0, <0, 0, 0>,
> 250, <0, 0, 250>,
> 300, <30, 0, 290>,
> 350, <60, 0, 330>,
> 600, <60, 0, 580>,
> 601, <60, 0, 590>,
> 602, <60, 0, 600>
> }
>
> But it's a very sad tunnel:
>
> http://www.flickr.com/photos/helveticafanatic/2681282339/
>
> What is wrong? Do I need more keypoints or something?
>
I suspect you wanted a shape a bit more like in the example below. I think
the problem was mainly that you were using very small increments at the
start and end of your spline and large increments in the middle. I find it
best to use a more uniform distribution of points along the curve.
>
> In tunnel planning, though, I should draw it on graph paper and find the
> key
> points, right?
>
It's easier to use a spline editor or a vector graphics program than doing
it on paper.
camera{location 2000*y look_at 0}
light_source{<1,100,-30> rgb 1}
#declare Train_Path = spline {
cubic_spline
-20, <0, 0, -10>,
-10, <0, 0, -5>,
0, <0, 0, 0>,
250, <0, 0, 250>,
300, <30, 0, 290>,
350, <60, 0, 330>,
600, <60, 0, 580>,
610, <60, 0, 590>,
620, <60, 0, 600>
}
sphere_sweep {
cubic_spline
605,
#local I = -2;
#while (I<603)
Train_Path(I),10
#local I = I + 1;
#end
texture {pigment {rgb <1,0,0>} finish {ambient 1}}
}
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Chris B" <nom### [at] nomailcom> wrote:
> "HelveticaFanatic" <nomail@nomail> wrote in message
> news:web.4881a898729c10115f60ef1e0@news.povray.org...
> > "HelveticaFanatic" <nomail@nomail> wrote:
> >> How can I make an animation of a train that follows curves and elevation?
> >> Is
> >> there anyway to lay track on it, either?
> >>
> > I coded this and got a tunnel:
> > ....
> > #declare Train_Path = spline {
> > cubic_spline
> > -2, <0, 0, -10>,
> > -1, <0, 0, -5>,
> > 0, <0, 0, 0>,
> > 250, <0, 0, 250>,
> > 300, <30, 0, 290>,
> > 350, <60, 0, 330>,
> > 600, <60, 0, 580>,
> > 601, <60, 0, 590>,
> > 602, <60, 0, 600>
> > }
> >
> > But it's a very sad tunnel:
> >
> > http://www.flickr.com/photos/helveticafanatic/2681282339/
> >
> > What is wrong? Do I need more keypoints or something?
> >
>
> I suspect you wanted a shape a bit more like in the example below. I think
> the problem was mainly that you were using very small increments at the
> start and end of your spline and large increments in the middle. I find it
> best to use a more uniform distribution of points along the curve.
>
> >
> > In tunnel planning, though, I should draw it on graph paper and find the
> > key
> > points, right?
> >
>
> It's easier to use a spline editor or a vector graphics program than doing
> it on paper.
>
>
> camera{location 2000*y look_at 0}
> light_source{<1,100,-30> rgb 1}
>
> #declare Train_Path = spline {
> cubic_spline
> -20, <0, 0, -10>,
> -10, <0, 0, -5>,
> 0, <0, 0, 0>,
> 250, <0, 0, 250>,
> 300, <30, 0, 290>,
> 350, <60, 0, 330>,
> 600, <60, 0, 580>,
> 610, <60, 0, 590>,
> 620, <60, 0, 600>
> }
>
> sphere_sweep {
> cubic_spline
> 605,
> #local I = -2;
> #while (I<603)
> Train_Path(I),10
> #local I = I + 1;
> #end
> texture {pigment {rgb <1,0,0>} finish {ambient 1}}
> }
What should I use for making the splines on a Mac?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
|
|
