3DGS Scene Clipping and Sectioning

Clipping Volumes

A clipping volume can be scaled, moved, and rotated freely, which helps developers clip an LCC scene spatially.

• A single Actor supports up to 65536 clipping volumes, limited to 50 in the free edition; see Editions and Licensing
• Box and sphere shapes are supported, and both can be scaled, moved, and rotated

Note: clipping only affects the final rendering. Clipped-away areas still take part in node traversal, load, and video memory upload as usual. Clipping therefore cannot reduce the load amount or video memory usage; use the methods in the Performance Guide to control those costs.

Steps

1. Place an LCCActor/LCC2Actor and load the scene.
2. Drag LCC Clipping Volume into the scene.

Dragging an LCC Clipping Volume into the scene

3. Move the clipping volume to the target position.
4. Add the Clipping Volume to the ClippingVolumes array in the Details panel of the Actor.

The Inside clipping result of a clipping volume

Demo

Moving a clipping volume and observing the clipping in real time

Properties

Blueprint Methods

LCCComponent → AddClippingVolume
LCCComponent → RemoveClippingVolume
ClippingVolume → Refresh()

Adding, removing, and refreshing a clipping volume with Blueprint nodes

Section Planes

A section plane can be scaled, moved, and rotated freely to section the scene along a plane.

• A single Actor supports up to 65536 section planes, limited to 50 in the free edition; see Editions and Licensing
• Sectioning upward or downward is supported, and the count is tracked separately from clipping volumes

Note: sectioning only affects the final rendering. Sectioned-away areas still take part in node traversal, load, and video memory upload as usual. Sectioning therefore cannot reduce the load amount or video memory usage.

Steps

1. Place an LCCActor/LCC2Actor and load the scene.
2. Drag LCC Section Plane into the scene.

Dragging an LCC Section Plane into the scene

3. Move it to the target position.
4. Add the Section Plane to the SectionPlanes array in the Details panel of the Actor.

Demo

Moving a section plane and observing the sectioning in real time

Properties

Blueprint Methods

LCCComponent → AddSectionPlane
LCCComponent → RemoveSectionPlane
SectionPlane → Refresh()

Adding, removing, and refreshing a section plane with Blueprint nodes