feat(i3s): Add an option to multiply colors by attribute

modules/i3s/src/lib/parsers/parse-i3s-tile-content.ts

@@ -23,7 +23,7 @@ import {getUrlWithToken} from '../utils/url-utils';
 
 import {GL_TYPE_MAP, getConstructorForDataFormat, sizeOf, COORDINATE_SYSTEM} from './constants';
 import {I3SLoaderOptions} from '../../i3s-loader';
-import {customizeColors} from '../utils/customizeColors';
+import {customizeColors} from '../utils/customize-сolors';
 
 const scratchVector = new Vector3([0, 0, 0]);
 

modules/i3s/src/lib/utils/customizeColors.ts → modules/i3s/src/lib/utils/customize-сolors.ts

@@ -4,7 +4,7 @@ import type {COLOR, I3STileOptions, I3STilesetOptions} from '../../types';
 import {load} from '@loaders.gl/core';
 import {getAttributeValueType, I3SAttributeLoader} from '../../i3s-attribute-loader';
 import {I3SLoaderOptions} from '../../i3s-loader';
-import {getUrlWithToken} from '../utils/url-utils';
+import {getUrlWithToken} from './url-utils';
 
 /**
  * Modify vertex colors array to visualize 3D objects in a attribute driven way
@@ -79,7 +79,17 @@ export async function customizeColors(
     if (!color) {
       continue; // eslint-disable-line no-continue
     }
-    colors.value.set(color, i * 4);
+
+    /* eslint max-statements: ["error", 30] */
+    /* eslint complexity: ["error", 12] */
+    if (options.i3s.colorsByAttribute.mode === 'multiply') {
+      // multiplying original mesh and calculated for attribute rgba colors in range 0-255
+      color.forEach((colorItem, index) => {
+        colors.value[i * 4 + index] = (colors.value[i * 4 + index] * colorItem) / 255;
+      });
+    } else {
+      colors.value.set(color, i * 4);
+    }
   }
 
   return colors;

modules/i3s/src/types.ts

@@ -114,6 +114,7 @@ export type I3SParseOptions = {
     maxValue: number;
     minColor: COLOR;
     maxColor: COLOR;
+    mode: string;
   };
 
   /** @deprecated */

modules/i3s/test/i3s-content-loader.spec.js

@@ -198,12 +198,12 @@ test('ParseI3sTileContent#should not decode the texture image if "decodeTextures
   t.end();
 });
 
-// TODO: Enable this test after test data is merged in master branch
-test.skip('ParseI3sTileContent#should colorize by attribute', async (t) => {
+test('ParseI3sTileContent#should colorize by attribute', async (t) => {
   const response = await fetchFile(NEW_YORK_TILE_CONTENT);
   const data = await response.arrayBuffer();
   const responseOptions = await fetchFile(NEW_YORK_CONTENT_LOADER_OPTIONS);
   const i3sLoaderOptions = await responseOptions.json();
+  i3sLoaderOptions.colorsByAttribute.mode = 'replace';
   const content = await parse(data, I3SContentLoader, {
     i3s: i3sLoaderOptions
   });
@@ -225,6 +225,33 @@ test.skip('ParseI3sTileContent#should colorize by attribute', async (t) => {
   t.end();
 });
 
+test('ParseI3sTileContent#should colorize by attribute using mutiplying colors', async (t) => {
+  const response = await fetchFile(NEW_YORK_TILE_CONTENT);
+  const data = await response.arrayBuffer();
+  const responseOptions = await fetchFile(NEW_YORK_CONTENT_LOADER_OPTIONS);
+  const i3sLoaderOptions = await responseOptions.json();
+  i3sLoaderOptions.colorsByAttribute.mode = 'multiply';
+  const content = await parse(data, I3SContentLoader, {
+    i3s: i3sLoaderOptions
+  });
+  t.ok(content);
+
+  // color array should be colorized by attribute using multiplying colors
+  const colorsArray = content.attributes.colors.value;
+  t.deepEquals(colorsArray.subarray(0, 9), [139, 139, 247, 255, 139, 139, 247, 255, 139]);
+  const arrayMiddle = (colorsArray.length - (colorsArray.length % 2)) / 2;
+  t.deepEquals(
+    colorsArray.subarray(arrayMiddle, arrayMiddle + 9),
+    [244, 255, 135, 135, 244, 255, 135, 135, 244]
+  );
+  t.deepEquals(
+    colorsArray.subarray(colorsArray.length - 9),
+    [255, 141, 141, 248, 255, 141, 141, 248, 255]
+  );
+
+  t.end();
+});
+
 function getI3SOptions(tile, tileset) {
   return {
     _tileOptions: {

yarn.lock

@@ -4050,9 +4050,9 @@ camelcase@^5.0.0, camelcase@^5.3.1:
   integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
 
 caniuse-lite@^1.0.30001449:
-  version "1.0.30001489"
-  resolved "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001489.tgz"
-  integrity sha512-x1mgZEXK8jHIfAxm+xgdpHpk50IN3z3q3zP261/WS+uvePxW8izXuCu6AHz0lkuYTlATDehiZ/tNyYBdSQsOUQ==
+  version "1.0.30001505"
+  resolved "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001505.tgz"
+  integrity sha512-jaAOR5zVtxHfL0NjZyflVTtXm3D3J9P15zSJ7HmQF8dSKGA6tqzQq+0ZI3xkjyQj46I4/M0K2GbMpcAFOcbr3A==
 
 caseless@~0.12.0:
   version "0.12.0"