NearPlaneLineMaterial

A fat line material (screen-space quad expansion, real linewidth in px) that is also SAFE across the camera near plane.

three's stock LineMaterial expands each segment into a screen-space quad in the vertex shader. When a segment endpoint is behind the camera plane its projected w <= 0, so the NDC math is garbage and the quad blows up to span the whole screen — the "infinity streak" seen under clipping (and on LOD wires). Stock LineMaterial handles only the case where ONE endpoint is behind (it trims that endpoint to the near plane via trimSegment); it does nothing when BOTH endpoints are behind, which is the remaining streak.

This subclass injects the missing both-behind guard: if both endpoints are behind the camera plane the segment has no valid projection, so we collapse it offscreen (gl_Position past the far plane) instead of expanding a bogus quad. This mirrors the near-plane guard of fragments' LOD line shader: one guard, shared semantics across the fat-line consumers (section edges, measurement lines, LOD wires).

The guard lives in the material's OWN vertexShader string (NOT an onBeforeCompile patch), so it SURVIVES .clone() — ShaderMaterial.clone copies vertexShader, whereas it drops onBeforeCompile. That matters because ClipEdges clones the style material per model in local-clipping mode.

Extends

• LineMaterial