RDB 2: rdb-example-04-update-points.cpp

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rdb-example-04-update-points.cpp
/*
*******************************************************************************
*
* Copyright 2026 RIEGL Laser Measurement Systems
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
*
*******************************************************************************
*/
/*!
*******************************************************************************
*
* \file rdb-example-04-update-points.cpp
* \author RIEGL LMS GmbH, Austria
* \brief RDB example 4: Update points
* \version 2015-10-14/AW: Initial version
* \version 2018-07-10/AW: Use new bindBuffer() instead of bind() function
*
* This example shows how to open an existing database and modify some points.
* This example is based on the database of rdb-example-1-create-database.
*
* Build instructions see "interface/cpp/riegl/README.TXT".
*
*******************************************************************************
*/
#include <vector>
#include <cstdint>
#include <iostream>
#include <exception>
#include <riegl/rdb.hpp>
#include <riegl/rdb/default.hpp>
int main()
{
try
{
// New RDB library context
riegl::rdb::Context context;
// Access existing database
riegl::rdb::Pointcloud rdb(context);
riegl::rdb::pointcloud::OpenSettings settings;
rdb. open("pointcloud.rdbx", settings);
// Before we can modify the database, we must start a transaction
riegl::rdb::pointcloud::TransactionScope transaction(
rdb, // point cloud object
"Update", // transaction title
"Point Classifier v1.0" // software name
);
// Prepare point attribute buffers
const uint32_t BUFFER_SIZE = 10000;
std::vector< uint64_t > bufferPointNumber(BUFFER_SIZE);
std::vector< uint16_t > bufferPointClass (BUFFER_SIZE);
// Start new select query to get point id of points with reflectance below -20 dB
riegl::rdb::pointcloud::QuerySelect select = rdb. select("riegl.reflectance < -20.0");
select. bindBuffer(riegl::rdb::pointcloud::RDB_RIEGL_ID, bufferPointNumber);
// Start new update query and define buffers
riegl::rdb::pointcloud::QueryUpdate update = rdb. update();
update. bindBuffer(riegl::rdb::pointcloud::RDB_RIEGL_ID, bufferPointNumber);
update.bindBuffer(riegl::rdb::pointcloud::RDB_RIEGL_CLASS, bufferPointClass);
// Process all points block-wise
while (const uint32_t count = select. next(BUFFER_SIZE))
{
// Define new point class
for (uint32_t i = 0; i < count; i++)
{
bufferPointClass[i] = 7;
}
// Actually update points
update. next(count);
}
// Finally commit transaction
transaction. commit();
// Success
return 0;
}
catch(const riegl::rdb::Error &error)
{
std::cerr << error. what() << " (" << error. details() << ")" << std::endl;
return 1; // error
}
catch(const std::exception &error)
{
std::cerr << error.what() << std::endl;
return 1; // error
}
}