Add function to update alignment

src/cli/ToolsMain.ts

@@ -282,6 +282,20 @@ export class ToolsMain {
     logger.debug(`Executing optimizeI3dm DONE`);
   }
 
+  static updateAlignment(input: string, output: string, force: boolean) {
+    logger.debug(`Executing updateAlignment`);
+    logger.debug(`  input: ${input}`);
+    logger.debug(`  output: ${output}`);
+    logger.debug(`  force: ${force}`);
+
+    ToolsMain.ensureCanWrite(output, force);
+    const inputBuffer = fs.readFileSync(input);
+    const outputBuffer = ContentOps.updateAlignment(inputBuffer);
+    fs.writeFileSync(output, outputBuffer);
+
+    logger.debug(`Executing updateAlignment DONE`);
+  }
+
   static analyze(
     inputFileName: string,
     outputDirectoryName: string,

src/cli/main.ts

@@ -225,6 +225,16 @@ function parseToolArgs(a: string[]) {
         },
       }
     )
+    .command(
+      "updateAlignment",
+      "Update the alignment of the batch- and feature table and the tile data" +
+        "as a whole, to meet the alignment requirements of the specification. " +
+        "This can be applied to B3DM, I3DM, PNTS, or CMPT tile data.",
+      {
+        i: inputStringDefinition,
+        o: outputStringDefinition,
+      }
+    )
     .command("gzip", "Gzips the input tileset directory.", {
       i: inputStringDefinition,
       o: outputStringDefinition,
@@ -488,6 +498,8 @@ async function runCommand(command: string, toolArgs: any, optionArgs: any) {
     await ToolsMain.optimizeB3dm(input, output, force, parsedOptionArgs);
   } else if (command === "optimizeI3dm") {
     await ToolsMain.optimizeI3dm(input, output, force, parsedOptionArgs);
+  } else if (command === "updateAlignment") {
+    await ToolsMain.updateAlignment(input, output, force);
   } else if (command === "gzip") {
     const tilesOnly = toolArgs.tilesOnly === true;
     await ToolsMain.gzip(input, output, force, tilesOnly);

src/tools/contentProcessing/ContentOps.ts

@@ -1,4 +1,5 @@
 import { TileFormats } from "../../tilesets";
+import { CompositeTileData } from "../../tilesets";
 
 import { GltfUtilities } from "./GltfUtilities";
 
@@ -149,4 +150,45 @@ export class ContentOps {
     const outputBuffer = TileFormats.createTileDataBuffer(outputTileData);
     return outputBuffer;
   }
+
+  /**
+   * Update the alignment of the given tile data buffer.
+   *
+   * This can be applied to B3DM, I3DM, PNTS, or CMPT tile data. It will
+   * read the tile data from the input, and generate a new tile data
+   * buffer with the same contents, but ensuring that the alignment
+   * requirements for the batch- and feature tables and the tile data
+   * as a whole are met. For CMPT tile data, the data of inner tiles
+   * will be updated recursively.
+   *
+   * @param inputBuffer - The input buffer
+   * @returns The resulting buffer
+   */
+  static updateAlignment(inputBuffer: Buffer): Buffer {
+    const isComposite = TileFormats.isComposite(inputBuffer);
+    if (isComposite) {
+      const inputCompositeTileData =
+        TileFormats.readCompositeTileData(inputBuffer);
+      const header = inputCompositeTileData.header;
+      const inputInnerTileBuffers = inputCompositeTileData.innerTileBuffers;
+      const outputInnerTileBuffers: Buffer[] = [];
+      for (let i = 0; i < inputInnerTileBuffers.length; i++) {
+        const inputInnerTileBuffer = inputInnerTileBuffers[i];
+        const outputInnerTileBuffer =
+          ContentOps.updateAlignment(inputInnerTileBuffer);
+        outputInnerTileBuffers.push(outputInnerTileBuffer);
+      }
+      const outputCompositeTileData: CompositeTileData = {
+        header: header,
+        innerTileBuffers: outputInnerTileBuffers,
+      };
+      const outputBuffer = TileFormats.createCompositeTileDataBuffer(
+        outputCompositeTileData
+      );
+      return outputBuffer;
+    }
+    const tileData = TileFormats.readTileData(inputBuffer);
+    const outputBuffer = TileFormats.createTileDataBuffer(tileData);
+    return outputBuffer;
+  }
 }