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smooth camera path

Started by Eitsch Feb 14, 2007 at 12:32 PM 2 replies 1.9k views

Original Post

Feb 14, 2007 at 12:32 PM

iam working on a "camera drive" module for my app. till now iam using linear interpolation between camera points. i thought about using some sort of spline to get smoother results. i googled around and found heavy weight libs to solve this problem. but what i need is just a function collection which allows to set some points and get interpolated position.... maybe something like that: spline.setPoints(vector points); and spline.getPositionAt(float a) where a is in the range[0...1] which represents current position on spline. what would you recommend in this case? thanks

RobTheBloke

128

RobTheBloke

Feb 15, 2007 at 12:12 PM

I'd use a spring/damper.

Palidine

200

Palidine

Feb 15, 2007 at 12:25 PM

Depending on the type of spline you'd need more than just the points. The "standard" spline I always think of is the photoshop spline: each point has 2 control points that modify the local curve to either side of the point.

Anyway, 10 second google found this library:

http://www.scs.fsu.edu/~burkardt/cpp_src/spline/spline.html

You may also just want to read up on splines on wikipedia, the math is relatively straight forward and is parameterized just like you need.

-me

TheAdmiral

Feb 15, 2007 at 12:43 PM

Quote:
Originally posted by Paladine
The "standard" spline I always think of is the photoshop spline: each point has 2 control points that modify the local curve to either side of the point.

That's a Bézier spline, if you were wondering.

There are a brazillion different types of spline out there and you'd be wise to do a little research before deciding upon one.

Nevertheless, if you're looking for a quick answer, I'd recommend the not-computationally-optimal, but oh-so-easy-to-implement Catmull-Rom spline. Given the existing setup of your work, it should take very little effort to implement, as the interpolant is calculated on-the-fly by feeding your source-vectors in, with need for messy precalculations.

Admiral

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