depthBias property

World-space offset toward the camera used for coplanar surface details. Positive values keep an overlay in front of its supporting surface without modifying its node transform. Zero and negative values leave the draw position unchanged.

A fixed world offset buys fewer depth-buffer steps as camera distance grows, so an overlay that holds up close can flicker far away. Prefer depthLayer, which holds at every distance. Billboards, sprites, line segments, and splats ignore this; they honor depthLayer.