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I'm trying to make an animation of a roller coaster and would like to
know how to use spline.inc to construct the track.
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Steven Jones <ste### [at] tsn cc> wrote:
> I'm trying to make an animation of a roller coaster and would like to
> know how to use spline.inc to construct the track.
If you're talking about my Spline include file for POV-Ray 3.0, then the
answer is DON'T!! I really don't think the file is up to such things,
especially considering the improvements that can be made using the new
features in POV 3.1.
Fortunately I have a completely new Spline macro system (apologies to those
who are sick of hearing me say so!), which would let you specify the track
shape without worrying about control points, then create the track just by
specifying a link object to follow the shape of the spline, and then let you
automatically animate an object, camera location, spotlight, etc. along the
newly created track.
I'm *still* fine-tuning features as I go, but if you (or indeed, anyone
who's interested) would like a copy, I'll gladly email one to you.
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Yeah that would be great Chris. Is there a way to figure out tangents
and normals to the curve?
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Serge LAROCQUE <sgl### [at] hotmailcom> wrote:
> So you mean your new spline system will let you specify through points
rather
> than control points?
The difficulty of specifying the Bezier control points in my previous spline
include file was one of the main issues people raised. The new macro file
actually gives you the choice of creating a range of cubic interpolating
splines, namely Kochanek-Bartels splines (which includes the cardinal
splines, which include Catmull-Rom splines, the default), Bezier curves, and
hermite splines. The first is specified as a list of interpolated points
only, the second as a list of points with every third point interpolated,
the last as a list of points and tangents.
Depending on the spline type you can adjust the curvature using tension,
continuity and/or bias controls. You can also specify a desired length and
the macro will adjust the spline tension so that the curve passes through
the points as specified, tightened or loosened to fit the length given.
Before writing the macros I also wrote code for cubic approximating splines
(beta and b-splines), and even started working on some code for NURBS
(curves, not surfaces). In the end, though, I decided that interpolating
splines would make most sense when hand-coded in POV-Ray.
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Steven Jones <ste### [at] tsncc> wrote:
> Yeah that would be great Chris. Is there a way to figure out tangents
> and normals to the curve?
The spline tangent and acceleration (as well as the distance along the
curve) are by default calculated and returned when using the automatic
spline animation and object creation features. The normal of the spline can
also be calculated, and I might add this as a feature, although you can use
the vector cross product of the tangent and acceleration.
For the animation, the direction of travel and curvature is also calculated
to automatically bank (roll), pitch, and turn the object/camera being
animated. When creating spline-based objects the component parts (the
macros offer a choice of cylinders/cones, blob spheres, predefined link
objects, torus coils, and torus pipes) are automatically rotated to follow
the spline.
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Chris Colefax wrote:
<snip>
> For the animation, the direction of travel and curvature is also calculated
> to automatically bank (roll), pitch, and turn the object/camera being
> animated. When creating spline-based objects the component parts (the
> macros offer a choice of cylinders/cones, blob spheres, predefined link
> objects, torus coils, and torus pipes) are automatically rotated to follow
> the spline.
Now we all know what you were doing the last months. I was wondering if
your macro/include well was running dry. But as far as I can see, your
new spline macro system will be a new masterpiece.
Anyone willing to make the according moray plugin?
Greets
Karl
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I found a new program on the POV-Ray web site called RC-Sim that solves the
problem I've been having. Weird thing is, some of it is in Japanese.
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Steven Jones wrote:
>
> I found a new program on the POV-Ray web site called RC-Sim that solves the
> problem I've been having. Weird thing is, some of it is in Japanese.
I just added that link a couple of days ago but forgot about this thread
or I would have let you know about it. I can't help with the Japanese part
so you are on your own.
--
Ken Tyler - 1300+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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I think I've worked most of it out anyway. A bit of logical thinking never
goes astray :)
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