要获取ARCore中网格顶点的世界坐标，您可以使用以下代码示例：

import com.google.ar.core.Anchor;
import com.google.ar.core.HitResult;
import com.google.ar.core.Plane;
import com.google.ar.core.PointCloud;
import com.google.ar.core.Pose;
import com.google.ar.core.Session;
import com.google.ar.core.Trackable;
import com.google.ar.core.TrackingState;

// 在ARCore帧中获取网格顶点的世界坐标
private void getPointCloudWorldVertices(Session session) {
    PointCloud pointCloud = session.acquirePointCloud();

    float[] pointCloudPoints = new float[pointCloud.getPoints().remaining()];
    pointCloud.getPoints().get(pointCloudPoints);

    for (int i = 0; i < pointCloud.getNumPoints(); i++) {
        float x = pointCloudPoints[i * 4];
        float y = pointCloudPoints[i * 4 + 1];
        float z = pointCloudPoints[i * 4 + 2];

        // 获取网格顶点的世界坐标
        float[] worldCoordinates = new float[3];
        pointCloud.getPose().transformPoint(new float[]{x, y, z}, 0, worldCoordinates, 0);

        // 打印网格顶点的世界坐标
        System.out.println("Point " + i + " World Coordinates: (" + worldCoordinates[0] + ", " + worldCoordinates[1] + ", " + worldCoordinates[2] + ")");
    }

    pointCloud.release();
}

// 在ARCore帧中获取平面的网格顶点的世界坐标
private void getPlaneWorldVertices(Session session, Plane plane) {
    float[] planeVertices = plane.getPolygon();

    for (int i = 0; i < planeVertices.length / 2; i++) {
        float x = planeVertices[i * 2];
        float z = planeVertices[i * 2 + 1];

        // 获取平面网格顶点的世界坐标
        float[] worldCoordinates = new float[3];
        plane.getCenterPose().transformPoint(new float[]{x, 0, z}, 0, worldCoordinates, 0);

        // 打印平面网格顶点的世界坐标
        System.out.println("Plane Vertex " + i + " World Coordinates: (" + worldCoordinates[0] + ", " + worldCoordinates[1] + ", " + worldCoordinates[2] + ")");
    }
}

// 在ARCore帧中获取跟踪对象的网格顶点的世界坐标
private void getTrackableWorldVertices(Session session, Trackable trackable) {
    if (trackable instanceof Plane && ((Plane) trackable).isPoseInPolygon(trackable.getPose())) {
        Plane plane = (Plane) trackable;
        getPlaneWorldVertices(session, plane);
    } else if (trackable instanceof com.google.ar.core.PointCloud && ((com.google.ar.core.PointCloud) trackable).getTrackingState() == TrackingState.TRACKING) {
        getPointCloudWorldVertices(session);
    } else if (trackable instanceof com.google.ar.core.Anchor) {
        Anchor anchor = (Anchor) trackable;
        Pose anchorPose = anchor.getPose();

        // 获取锚点的世界坐标
        float[] worldCoordinates = new float[3];
        anchorPose.getTranslation(worldCoordinates, 0);

        // 打印锚点的世界坐标
        System.out.println("Anchor World Coordinates: (" + worldCoordinates[0] + ", " + worldCoordinates[1] + ", " + worldCoordinates[2] + ")");
    }
}

// 在ARCore帧中获取所有跟踪对象的网格顶点的世界坐标
private void getAllTrackableWorldVertices(Session session) {
    for (Trackable trackable : session.getAllTrackables()) {
        getTrackableWorldVertices(session, trackable);
    }
}

这些代码示例演示了如何获取ARCore中网格顶点的世界坐标。您可以根据需要将其集成到您的项目中，并根据实际情况进行修改和扩展。