hra-api/src/library/shared/spatial/scene-traversal.js

The Human Reference Atlas (HRA) API deployed to https://apps.humanatlas.io/api/

// Converted from transpiled ccf-ui code:
// https://github.com/hubmapconsortium/ccf-ui/blob/main/projects/ccf-body-ui/src/lib/util/scene-traversal.ts

import { Matrix4 } from '@math.gl/core';

export function traverseScene(scene, worldMatrix, visitor) {
  if (!worldMatrix) {
    worldMatrix = new Matrix4(Matrix4.IDENTITY);
  }
  const matrix = new Matrix4(Matrix4.IDENTITY);
  if (!scene) {
    return true;
  } else if (scene.matrix) {
    matrix.copy(scene.matrix);
  } else {
    matrix.identity();
    if (scene.translation) {
      matrix.translate(scene.translation);
    }
    if (scene.rotation) {
      const rotationMatrix = new Matrix4(Matrix4.IDENTITY).fromQuaternion(scene.rotation);
      matrix.multiplyRight(rotationMatrix);
    }
    if (scene.scale) {
      matrix.scale(scene.scale);
    }
  }
  const modelMatrix = new Matrix4(worldMatrix).multiplyRight(matrix);
  if (visitor(scene, modelMatrix, worldMatrix) === false) {
    return false;
  }
  for (const child of scene.nodes || scene.children || []) {
    if (traverseScene(child, modelMatrix, visitor) === false) {
      return false;
    }
  }
  return true;
}