三角剖分弄乱了三角形

Question

我正在尝试对凸多边形进行三角剖分。

左边是三角化的多边形，右边是没有三角化的凸多边形。（都错了）但是右边的那个位置是对的，除了少了凸的部分，还不错...

我创建三角形并将它们添加到数组列表

    float[] vertices = polygonObject.getPolygon().getTransformedVertices();
    float[] worldVertices = new float[vertices.length];

    for (int i = 0; i < vertices.length; ++i) {
        System.out.println(vertices[i]);
        worldVertices[i] = vertices[i] / ppt;
    }

    // Make triangles
    Vector<float[]> trianglesVertices = new Vector<float[]>();

    EarClippingTriangulator triangulator = new EarClippingTriangulator();
    ArrayList<PolygonShape> triangles = new ArrayList<PolygonShape>();

    ShortArray pointsCoords = triangulator.computeTriangles(worldVertices);

    for (int i = 0; i < pointsCoords.size / 6; i++)
    {
        trianglesVertices.add(new float[] {
                pointsCoords.get(i*6),      pointsCoords.get(i*6 + 1),
                pointsCoords.get(i*6 + 2),  pointsCoords.get(i*6 + 3),
                pointsCoords.get(i*6 + 4),  pointsCoords.get(i*6 + 5),
        });

        PolygonShape triangleShape = new PolygonShape();
        triangleShape.set(trianglesVertices.get(i));
        triangles.add(triangleShape);
    }

稍后我循环那个 arraylist 并创建主体，但不知何故 libgdx（可能是我，而不是 libgdx）完全搞砸了。

            for(PolygonShape triangle:triangles){
                BodyDef bd = new BodyDef();
                bd.type = BodyDef.BodyType.StaticBody;
                Body body = world.createBody(bd);
                body.createFixture(triangle, 1);

                bodies.add(body);

                triangle.dispose();
            }

这是我要在 libgdx 中渲染的形状（在 Tiled 中创建）

Answer 1

我找到了另一个例子，它成功了！

https://github.com/MobiDevelop/maps-editor/blob/master/maps-basic/src/com/mobidevelop/maps/basic/BasicMapRenderer.java#L151

我从这个数组创建三角形的方式是错误的

ShortArray pointsCoords = triangulator.computeTriangles(worldVertices);

这是正确创建三角形的代码，

    for (int i = 0; i < pointsCoords.size; i += 3) {
        int v1 = pointsCoords.get(i) * 2;
        int v2 = pointsCoords.get(i + 1) * 2;
        int v3 = pointsCoords.get(i + 2) * 2;

        PolygonShape triangleShape = new PolygonShape();
        triangleShape.set(
                new float[]{
                        worldVertices[v1 + 0],
                        worldVertices[v1 + 1],
                        worldVertices[v2 + 0],
                        worldVertices[v2 + 1],
                        worldVertices[v3 + 0],
                        worldVertices[v3 + 1]
                }

        );
        triangles.add(triangleShape);
    }

三角剖分弄乱了三角形

triangulation messing up triangles

libgdx

box2d

polygon

triangulation