如何在Java 3D中绘制透明平面？

Question

我试图在Java3D中绘制一个透明平面（X[0..100]，Y[0..100]，Z=0），但不知道如何绘制。我在教程页面上看过了，仍然找不到任何示例程序

我试图找到一个“平面”对象作为分支组添加到现有的TransformGroup中，但没有这样的平面对象；我应该用什么？我如何让它透明

Answer 1

试试这个代码

BranchGroup group = new BranchGroup();  //Content branch.
PolygonAttributes p = new PolygonAttributes();  //Not sure how to make it transparent/try code above.
Appearance planeAppearance = new Appearance();
planeAppearance.setPolygonAttributes (p);
Color3f planeColor = new Color3f (1.0f, 1.0f, 1.0f);  //This makes it white.
ColoringAttributes planeCA = new ColoringAttributes (planeColor, 1);
planeAppearance.setColoringAttributes(planeCA);
QuadArray plane = new QuadArray (4, QuadArray.COORDINATES);  //This makes the plane.
  plane.setCoordinate(0, new Point3f(-5f, -5f, -15f));  //You specify your own cornerpoints...
  plane.setCoordinate(1, new Point3f(5f, -5f, -15f));
  plane.setCoordinate(2, new Point3f(5f, 5f, -15f));
  plane.setCoordinate(3, new Point3f(-5f, 5f, -15f));
group.addChild(new Shape3D(plane, planeAppearance));  //Add plane to content branch.

Answer 2

这是我在柱状图上使用的一段代码——这可能适用于平面

private static void createAppearances() {
    normalAppearance = new Appearance();
    normalAppearance.setMaterial(normalMaterial);
    selectedAppearance = new Appearance();
    selectedAppearance.setMaterial(selectedMaterial);
    TransparencyAttributes ta = new TransparencyAttributes();

    ta.setTransparencyMode (TransparencyAttributes.BLENDED);
    ta.setTransparency (DEFAULT_HISTOGRAM_ALPHA);

    normalAppearance.setTransparencyAttributes (ta);
    selectedAppearance.setTransparencyAttributes(ta);
}

如果我没记错的话，关键是TransparencyAttributes。我希望我能告诉你更多，但我现在无法编译（缺少一些与3D无关的旧库）