Class KBCubicSplineSegment
- java.lang.Object
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- com.sun.j3d.utils.behaviors.interpolators.KBCubicSplineSegment
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public class KBCubicSplineSegment extends java.lang.Object
The KBCubicSplineSegment class creates the representation of a Kochanek-Bartel's (also known as the TCB or Tension-Continuity-Bias Spline. This class takes 4 key frames as its input (using KBKeyFrame). If interpolating between the ith and (i+1)th key frame then the four key frames that need to be specified are the (i-1)th, ith, (i+1)th and (i+2)th keyframes in order. The KBCubicSegmentClass then pre-computes the hermite interpolation basis coefficients if the (i+1)th frame has the linear flag set to zero. These are used to calculate the interpolated position, scale and quaternions when they requested by the user using the getInterpolated* methods. If the the (i+1)th frame's linear flag is set to 1 then the class uses linear interpolation to calculate the interpolated position, scale, heading pitch and bank it returns through the getInterpolated* methods.- Since:
- Java3D 1.2
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description float
computeLength(float u)
Computes the length of the curve at a given point between key frames.float
getInterpolatedBank(float u)
Computes the interpolated bank along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.float
getInterpolatedHeading(float u)
Computes the interpolated heading along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.float
getInterpolatedPitch(float u)
Computes the interpolated pitch along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.void
getInterpolatedPosition(float u, javax.vecmath.Point3f newPos)
Computes the interpolated position along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components.void
getInterpolatedPositionVector(float u, javax.vecmath.Vector3f newPos)
Computes the interpolated position along the curve at a given point between key frames and returns a Vector3f with the interpolated x, y, and z scale components.void
getInterpolatedScale(float u, javax.vecmath.Point3f newScale)
Computes the interpolated scale along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components.float
getInterpolatedValue(float u)
Computes the ratio of the length of the spline from the ith key frame to the position specified by u to the length of the entire spline segment from the ith key frame to the (i+1) th key frame.
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Method Detail
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computeLength
public float computeLength(float u)
Computes the length of the curve at a given point between key frames.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.
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getInterpolatedScale
public void getInterpolatedScale(float u, javax.vecmath.Point3f newScale)
Computes the interpolated scale along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.newScale
- returns the interpolated x,y,z scale value in a Point3f
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getInterpolatedPosition
public void getInterpolatedPosition(float u, javax.vecmath.Point3f newPos)
Computes the interpolated position along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.newPos
- returns the interpolated x,y,z position in a Point3f
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getInterpolatedPositionVector
public void getInterpolatedPositionVector(float u, javax.vecmath.Vector3f newPos)
Computes the interpolated position along the curve at a given point between key frames and returns a Vector3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.newPos
- returns the interpolated x,y,z position in a Vector3f.
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getInterpolatedHeading
public float getInterpolatedHeading(float u)
Computes the interpolated heading along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.- Returns:
- returns the interpolated heading value
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getInterpolatedPitch
public float getInterpolatedPitch(float u)
Computes the interpolated pitch along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.- Returns:
- returns the interpolated pitch value
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getInterpolatedBank
public float getInterpolatedBank(float u)
Computes the interpolated bank along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.- Returns:
- returns the interpolated bank value
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getInterpolatedValue
public float getInterpolatedValue(float u)
Computes the ratio of the length of the spline from the ith key frame to the position specified by u to the length of the entire spline segment from the ith key frame to the (i+1) th key frame. When the (i+1)th key frame's linear value is equal to 1, this is meaninful otherwise it should return u.- Parameters:
u
- specifies the point between keyframes where 0 <= u <= 1.- Returns:
- the interpolated ratio
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