我想通过它的置信度值对 PointCloud 进行着色。
首先,我创建了三个 FloatBuffer,我在其中放置基于阈值的单个点。
private FloatBuffer makeFLoatBuffer(ArrayList<Float> conf) {
FloatBuffer confFB = FloatBuffer.allocate(conf.size());
for(Float value : conf){
confFB.put(value);
}
confFB.rewind();
return confFB;
}
private ArrayList<FloatBuffer> splitPointCloudOnConfidence(PointCloud cloud) {
ArrayList<Float> conf1 = new ArrayList<>();
ArrayList<Float> conf2 = new ArrayList<>();
ArrayList<Float> conf3 = new ArrayList<>();
ArrayList<FloatBuffer> floatBufferArray = new ArrayList<>();
FloatBuffer buf_temp = cloud.getPoints();
int buf_temp_limit = buf_temp.limit();
for (int i = 0; i < buf_temp_limit / 4; i++) {
float x = buf_temp.get(i * 4);
float y = buf_temp.get(i * 4 + 1);
float z = buf_temp.get(i * 4 + 2);
float confidence = buf_temp.get(i * 4 + 3);
if(confidence < 1.0 && confidence > 0.5){
conf1.add(x);
conf1.add(y);
conf1.add(z);
conf1.add(confidence);
} else if(confidence < 0.5 && confidence > 0.2) {
conf2.add(x);
conf2.add(y);
conf2.add(z);
conf2.add(confidence);
} else {
conf3.add(x);
conf3.add(y);
conf3.add(z);
conf3.add(confidence);
}
}
floatBufferArray.add(makeFLoatBuffer(conf1));
floatBufferArray.add(makeFLoatBuffer(conf2));
floatBufferArray.add(makeFLoatBuffer(conf3));
return floatBufferArray;
}
我还创建了三个负责可视化点云的节点。为此,我使用了此类的略微修改版本 https://github.com/claywilkinson/arcore-android-sdk/blob/sceneform-samples/samples/cloud_anchor_java/app/src/main/java/com/google/ar /core/examples/java/cloudanchor/sceneform/PointCloudNode.java
pointCloudNodeTestRed = new PointCloudNode_v2(this, color_red);
pointCloudNodeTestRed.setEnabled(true);
pointCloudNodeTestYellow = new PointCloudNode_v2(this, color_yellow);
pointCloudNodeTestYellow.setEnabled(true);
pointCloudNodeTestGreen = new PointCloudNode_v2(this, color_green);
pointCloudNodeTestGreen.setEnabled(true);
fragment.getArSceneView().getScene().addChild(pointCloudNodeTestRed);
fragment.getArSceneView().getScene().addChild( pointCloudNodeTestYellow);
fragment.getArSceneView().getScene().addChild( pointCloudNodeTestGreen);
在 onUpdateListener 中,我将特定数据提供给三个节点。
PointCloud pC = frame.acquirePointCloud();
ArrayList<FloatBuffer> bufHolder = splitPointCloudOnConfidence(pC);
pointCloudNodeTestRed.update(pC, bufHolder.get(2));
pointCloudNodeTestYellow.update(pC, bufHolder.get(1));
pointCloudNodeTestGreen.update(pC, bufHolder.get(0));
pC.release();
我的问题一般。有没有更好的方法来实现这样的可视化?