Function getRayIntersection

packages/engine/Source/Scene/Picking.js:1102–1186

(
  picking,
  scene,
  ray,
  objectsToExclude,
  width,
  requirePosition,
  mostDetailed,
)

}

function getRayIntersection(
  picking,
  scene,
  ray,
  objectsToExclude,
  width,
  requirePosition,
  mostDetailed,
) {
  const { context, frameState } = scene;
  const uniformState = context.uniformState;

  const view = picking._pickOffscreenView;
  scene.view = view;

  updateOffscreenCameraFromRay(picking, ray, width, view.camera);

  const drawingBufferRectangle = BoundingRectangle.clone(
    view.viewport,
    scratchRectangle,
  );

  const passState = view.pickFramebuffer.begin(
    drawingBufferRectangle,
    view.viewport,
  );

  scene.jobScheduler.disableThisFrame();

  scene.updateFrameState();
  frameState.invertClassification = false;
  frameState.passes.pick = true;
  frameState.passes.offscreen = true;

  if (mostDetailed) {
    frameState.tilesetPassState = mostDetailedPickTilesetPassState;
  } else {
    frameState.tilesetPassState = pickTilesetPassState;
  }

  uniformState.update(frameState);

  scene.updateEnvironment();
  scene.updateAndExecuteCommands(passState, scratchColorZero);
  scene.resolveFramebuffers(passState);

  let position;
  // Picking one object, result is either [object] or []
  const object = view.pickFramebuffer.end(drawingBufferRectangle, 1)[0];

  if (scene.context.depthTexture) {
    const { frustumCommandsList } = view;
    const numFrustums = frustumCommandsList.length;
    for (let i = 0; i < numFrustums; ++i) {
      const pickDepth = picking.getPickDepth(scene, i);
      const depth = pickDepth.getDepth(context, 0, 0);
      if (!defined(depth)) {
        continue;