使用java3D和rotpospathInterpolator制作正确的动画
我试图让一个物体在一个正方形中飞过我的场景(这是正确的),但我希望它也朝向它要去的地方 目前的问题是物体会飞,并且在飞行时会旋转(这不是自然现象)。我希望它飞到一个点,然后停下来旋转,然后飞到下一个点,然后再次旋转,依此类推 我试图通过Java3D函数实现这一点: 旋转插补器 这就是我正在做的:使用java3D和rotpospathInterpolator制作正确的动画,java,animation,java-3d,Java,Animation,Java 3d,我试图让一个物体在一个正方形中飞过我的场景(这是正确的),但我希望它也朝向它要去的地方 目前的问题是物体会飞,并且在飞行时会旋转(这不是自然现象)。我希望它飞到一个点,然后停下来旋转,然后飞到下一个点,然后再次旋转,依此类推 我试图通过Java3D函数实现这一点: 旋转插补器 这就是我正在做的: Alpha alphaNave = new Alpha( -1, Alpha.INCREASING_ENABLE, 0,0,6000,0,0,0,0,0 ); TransformGroup target
Alpha alphaNave = new Alpha( -1, Alpha.INCREASING_ENABLE, 0,0,6000,0,0,0,0,0 );
TransformGroup target = new TransformGroup();
Transform3D axisOfRotPos = new Transform3D();
float[] alphas = {0.0f, 0.25f, 0.50f, 0.75f, 1.0f};
Quat4f[] quats = new Quat4f[5];
Point3f[] positions = new Point3f[5];
target.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
quats[0] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(0));
quats[1] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(90));
quats[2] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(180));
quats[3] = new Quat4f(0.0f, 1.0f, 0.0f, (float) Math.toRadians(270));
quats[4] = quats[0];
positions[0]= new Point3f( -20.0f, 0.0f, 20.0f);
positions[1]= new Point3f( -20.0f, 0.0f, -20.0f);
positions[2]= new Point3f( 20.0f, 0.0f, -20.0f);
positions[3]= new Point3f( 20.0f, 0.0f, 20.0f);
positions[4]= positions[0];
RotPosPathInterpolator rotPosPath = new RotPosPathInterpolator(
alphaNave, target, axisOfRotPos, alphas, quats, positions);
首先是简短的旁注:创建四元数时,最后一个分量不是角度。为了创建一个四元数来描述围绕特定轴、围绕特定角度的旋转,最简单的方法是浏览
AxisAngle4f
类
AxisAngle4f a = new AxisAngle4f(0.0f, 1.0f, 0.0f, angleInRadians);
Quat4f q = new Quat4f();
q.set(a);
(不幸的是,没有方便的构造函数来实现这一点。我建议用返回适当四元数的实用方法来包装这三行)
关于实际问题:如果我正确理解了你,那么期望的行为是: (这是根据我在下面添加的创建的) 如果只希望有一个移动(无旋转),则必须在插值路径中插入两个点,其中只有位置更改,但旋转保持不变。类似地,如果只需要旋转,则必须创建两个点,其中只有旋转发生变化,但位置保持不变。当然,您必须始终相应地调整
alpha
值
在本例中,您的路径将由9个点组成。手动添加这些点,并计算所需的alpha
值是一件麻烦事。我建议为此创建一个小型实用程序类。下面的MCVE允许将点(每个点包括一个位置和一个角度)添加到InterpolatorData
类,该类随后为插值器提供数据
import java.awt.GraphicsConfiguration;
import java.util.ArrayList;
import java.util.List;
import javax.media.j3d.Alpha;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.RotPosPathInterpolator;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.vecmath.AxisAngle4f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Quat4f;
import javax.vecmath.Vector3d;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class RotPosPathInterpolatorTest
{
public static void main(String[] args)
{
System.setProperty("sun.awt.noerasebackground", "true");
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);;
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas = new Canvas3D(config);
frame.getContentPane().add(canvas);
SimpleUniverse simpleUniverse = new SimpleUniverse(canvas);
BranchGroup rootBranchGroup = new BranchGroup();
createContents(rootBranchGroup);
simpleUniverse.addBranchGraph(rootBranchGroup);
Transform3D t0 = new Transform3D();
t0.rotX(Math.toRadians(-45));
Transform3D t1 = new Transform3D();
t1.setTranslation(new Vector3d(0,0,10));
t0.mul(t1);
simpleUniverse.
getViewingPlatform().
getViewPlatformTransform().
setTransform(t0);
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static class InterpolatorData
{
private final List<Point3f> positions = new ArrayList<Point3f>();
private final List<Quat4f> orientations = new ArrayList<Quat4f>();
void add(Point3f p, float angleDeg)
{
positions.add(p);
AxisAngle4f a = new AxisAngle4f(
0.0f, 1.0f, 0.0f, (float) Math.toRadians(angleDeg));
Quat4f q = new Quat4f();
q.set(a);
orientations.add(q);
}
Point3f[] getPositions()
{
return positions.toArray(new Point3f[0]);
}
Quat4f[] getOrientations()
{
return orientations.toArray(new Quat4f[0]);
}
float[] getAlphas()
{
float alphas[] = new float[positions.size()];
float delta = 1.0f / (alphas.length - 1);
for (int i=0; i<alphas.length; i++)
{
alphas[i] = i * delta;
}
return alphas;
}
}
private static void createContents(BranchGroup rootBranchGroup)
{
Alpha alpha = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0, 6000, 0, 0, 0, 0, 0);
TransformGroup target = new TransformGroup();
target.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
Transform3D axisOfTransform = new Transform3D();
InterpolatorData i = new InterpolatorData();
i.add(new Point3f(-2.0f, 0.0f, 2.0f), 0.0f);
i.add(new Point3f(-2.0f, 0.0f, -2.0f), 0.0f);
i.add(new Point3f(-2.0f, 0.0f, -2.0f), 90.0f);
i.add(new Point3f( 2.0f, 0.0f, -2.0f), 90.0f);
i.add(new Point3f( 2.0f, 0.0f, -2.0f), 180.0f);
i.add(new Point3f( 2.0f, 0.0f, 2.0f), 180.0f);
i.add(new Point3f( 2.0f, 0.0f, 2.0f), 270.0f);
i.add(new Point3f(-2.0f, 0.0f, 2.0f), 270.0f);
i.add(new Point3f(-2.0f, 0.0f, 2.0f), 0.0f);
RotPosPathInterpolator interpolator = new RotPosPathInterpolator(
alpha, target, axisOfTransform,
i.getAlphas(), i.getOrientations(), i.getPositions());
interpolator.setSchedulingBounds(
new BoundingSphere(new Point3d(), 100.0));
rootBranchGroup.addChild(target);
target.addChild(interpolator);
target.addChild(new ColorCube(0.4));
}
}
导入java.awt.GraphicsConfiguration;
导入java.util.ArrayList;
导入java.util.List;
导入javax.media.j3d.Alpha;
导入javax.media.j3d.BoundingSphere;
导入javax.media.j3d.BranchGroup;
导入javax.media.j3d.Canvas3D;
导入javax.media.j3d.RotPosPathInterpolator;
导入javax.media.j3d.Transform3D;
导入javax.media.j3d.TransformGroup;
导入javax.swing.JFrame;
导入javax.swing.SwingUtilities;
导入javax.vecmath.AxisAngle4f;
导入javax.vecmath.Point3d;
导入javax.vecmath.Point3f;
导入javax.vecmath.Quat4f;
导入javax.vecmath.Vector3d;
导入com.sun.j3d.utils.geometry.ColorCube;
导入com.sun.j3d.utils.universe.SimpleUniverse;
公共类Rotpospathortest
{
公共静态void main(字符串[]args)
{
System.setProperty(“sun.awt.noerasebackground”、“true”);
SwingUtilities.invokeLater(新的Runnable()
{
@凌驾
公开募捐
{
createAndShowGUI();
}
});
}
私有静态void createAndShowGUI()
{
JFrame=新JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);;
图形配置配置=
SimpleUniverse.getPreferredConfiguration();
Canvas3D画布=新的Canvas3D(配置);
frame.getContentPane().add(画布);
SimpleUniverse SimpleUniverse=新SimpleUniverse(画布);
BranchGroup rootBranchGroup=新建BranchGroup();
createContents(rootBranchGroup);
simpleUniverse.addBranchGraph(rootBranchGroup);
Transform3D t0=新Transform3D();
t0.rotX(数学托拉迪安(-45));
Transform3D t1=新Transform3D();
t1.集平移(新向量3D(0,0,10));
t0.mul(t1);
简单宇宙。
getViewingPlatform()。
getViewPlatformTransform()。
setTransform(t0);
框架。设置尺寸(400400);
frame.setLocationRelativeTo(空);
frame.setVisible(true);
}
私有静态类插值数据
{
私有最终列表位置=新ArrayList();
私有最终列表方向=新建ArrayList();
无效添加(点3F p,浮动角度DEG)
{
增加(p);
AxisAngle4f a=新AxisAngle4f(
0.0f,1.0f,0.0f,(浮动)数学托拉半径(角度度);
Quat4f q=新的Quat4f();
q、 组(a);
方向。添加(q);
}
点3f[]获取位置()
{
返回位置。toArray(新的点3f[0]);
}
Quat4f[]获取方向()
{
返回方向。toArray(新的Quat4f[0]);
}
float[]getAlphas()
{
float alphas[]=新的float[positions.size()];
浮动增量=1.0f/(字母长度-1);
对于(int i=0;i