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Code Snippets / Using splines to create a smooth curve between many points [DBPro]

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Hamish McHaggis
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Posted: 18th Apr 2004 16:53 Edited at: 18th Apr 2004 16:56
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This should come in handy for some people who need to make racing tracks, rollercoasters or smooth camera movement between points. This code uses the DBPro 3D Maths commands to find the points along a catmull rom spline. The good thing about this spline is that it passes through ALL of the points, and you can link many of them up to create a long smooth curving line, due to the fact that the tangent at the end points are the same.

For technical info on catmull rom splines look here...
http://www.mvps.org/directx/articles/catmull

You can also use vector3 for 3D splines, they work in exactly the same way but it requires and outputs 3 coordinates.

Trying is the first step towards faliure.
Athelon XP 1600+/Radeon 9600 Pro/256 RAM
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Phaelax
DBPro Master
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Posted: 19th Apr 2004 19:59
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catmull splines is basically a line that goes through a set of specified points?

"eureka" - Archimedes
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Hamish McHaggis
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Posted: 19th Apr 2004 20:44
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Yep, a curved line. It's handy for finding a SMOOTH path from point to point.

Trying is the first step towards faliure.
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Peter H
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Posted: 20th Apr 2004 17:58
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cool!...though i'm not sure if i'd ever be able to figure it out to actually use...


Formerly known as "DarkWing Duck"
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Mussi
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Posted: 21st Apr 2004 23:25
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Quote: "Yep, a curved line. It's handy for finding a SMOOTH path from point to point."

are the calculations faster than just adding more points? i.e. you have a race game where the computer has a path of points set, which are then followed by the computer player.



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Hamish McHaggis
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Posted: 24th Apr 2004 00:26
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The calculations are very fast, and it will certainly wave you time plotting all the points to make a curve. And even then it won't be a real curve.

Trying is the first step towards faliure.
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