DataFilterExtension performance with large datasets: Is getFilterValue called when filterEnabled is false?

[abdcelik]

Use Case

I have a 3D point cloud visualization with the following requirements:

• Dataset size: +1 million points
• Two modes:
  • Play/Live mode: No filtering needed, performance is critical
  • Pause mode: Spatial filtering (clipping) by bounding box

I'm using DataFilterExtension with filterSize: 3 for XYZ coordinates and toggling filterEnabled between the two modes.

Question

Does getFilterValue get called for all data points even when filterEnabled: false?

I'm concerned about performance in live mode where filtering is disabled but the extension is still present on the layer.

Current Implementation

const extension = new DataFilterExtension({ filterSize: 3 });

// Mode changes between play and pause
const shouldFilter = !isPlaying && isClippingEnabled;

new PointCloudLayer({
  data: { length: 1000000, /* ... */ },
  extensions: [extension],
  filterEnabled: shouldFilter, // true in pause, false in play
  filterRange: clipBounds,
  getFilterValue: (d, info) => {
    // This involves array access and position calculation
    ...
    return position ?? null;
  },
});

Concerns

• Is getFilterValue invoked when filterEnabled: false? If yes, this could cause performance issues with +1M points being processed unnecessarily every frame.
• Should I use a different approach?
• What's the best practice for conditionally enabling/disabling filtering on large datasets?

Alternative Approaches Considered

Two separate layers - one with extension, one without, visualize conditionally

Questions

Is DataFilterExtension appropriate for this use case?
What's the performance impact of keeping the extension with filterEnabled: false?
What's the recommended pattern for toggling filtering on/off with large datasets?

Any guidance would be appreciated!