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如何在Java 3D中绘制透明平面？

发布于 2024-07-29 13:19:50 字数 185 浏览 8 评论 0原文

我试图在 Java 3D 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。我查看了教程页面，仍然找不到任何示例程序。

我试图找到一个“平面”对象作为 BranchGroup 以添加到我现有的 TransformGroup，但没有这样的平面对象；我应该用什么？以及如何使其透明？

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蓝咒 2024-08-05 13:19:50

这是我在直方图上使用的代码片段 - 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信息，但我现在无法编译它（缺少一些与 3D 无关的旧库）。

This is a snippet of code I used on a histogram - this might work on a flat plane.

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);
}

The key is the TransparencyAttributes if I remember correctly. I wish I could tell you more but I can't get this to compile right now (missing some old libraries that aren't related to 3D).

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夜空下最亮的亮点 2024-08-05 13:19:50

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.

Try this code...

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.

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~没有更多了~