> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/3d-multi-sensor-fusion/labeling/3d-multi-sensor-fusion-labeling-editor/key-features/point-projection-and-frustum.md).

# Point Projection and Frustum

### Point Projection

Raycaster is the point projection of the cursor coordinates in the point cloud over the images in the image panel to help annotators identify the object swiftly. It appears as a "red dot" over the camera images while hovering the cursor over the points in the point cloud.

<figure><img src="/files/WDYzKh1gQ5OFAi3eFBJz" alt=""><figcaption></figcaption></figure>

### Field of View (FoV)

Field of View highlights point cloud sections visible in a selected camera image, helping annotators quickly identify which 3D points correspond to that specific camera's perspective for accurate annotation.

<figure><img src="/files/RVcsNrSvylYKCVI4vNyj" alt=""><figcaption></figcaption></figure>


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