Function getPickCullingVolume

packages/engine/Source/Scene/Picking.js:198–226

(
  scene,
  drawingBufferPosition,
  width,
  height,
  viewport,
)

}

function getPickCullingVolume(
  scene,
  drawingBufferPosition,
  width,
  height,
  viewport,
) {
  const frustum = scene.camera.frustum;
  if (
    frustum instanceof OrthographicFrustum ||
    frustum instanceof OrthographicOffCenterFrustum
  ) {
    return getPickOrthographicCullingVolume(
      scene,
      drawingBufferPosition,
      width,
      height,
      viewport,
    );
  }

  return getPickPerspectiveCullingVolume(
    scene,
    drawingBufferPosition,
    width,
    height,
    viewport,
  );
}

// Pick position and rectangle, used in all picking functions,
// filled in computePickingDrawingBufferRectangle and passed