In aerial oblique or terrestrial projects, part of the images is covered by sky. The sky does not consist of meaningful keypoints; however, it can happen that some of the sky keypoints extracted are matched in the images and reconstructed in the 3D model introducing noise to the model. It is possible to annotate the sky not to take it into account for processing.
To remove the sky from the Point Cloud:
1. Click View > rayCloud.
2. In the section Layers of the left sidebar, select one image that is covered by sky.
3. In the right sidebar, click the Annotation tool button 
.
4. In Annotate, select Carve.
5. Annotate the sky in the image, following How to Annotate Images in the rayCloud (steps 7-13).
- If step 2. Point Cloud and Mesh is already processed, the effect of the annotation is immediately visible in the 3D View of the rayCloud, but the results saved in the results folder are not updated automatically. The annotated point cloud can be saved by reprocessing step 2. Point Cloud and Mesh or by exporting the point cloud. More here: How to export the Point Cloud
- If step 2. Point Cloud and Mesh is not processed, the annotation will affect the point cloud displayed in the rayCloud after processing and the results saved in the results folder.
6. Repeat steps 2-5:
- If step 2 is already processed, till the sky points are removed from the 3D View of the rayCloud.
- If step 2 is not processed yet, till the sky is annotated in all the images that it appears.
7. Make sure that the Use Annotation box is selected in the Processing Options: How to Annotate Images in the rayCloud (step 14).
8. Process step 2. Point Cloud and Mesh to remove the annotated pixels from all the results.