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Claude
03598229ba
The viewer projected a 3D layer's box, its axis gizmo and its Extended Viewer outline through the camera with a plain perspective divide. A point at or behind the camera (w ≤ 0) flips through infinity, so a layer turned or moved so that part of it reaches past the camera drew long lines across the viewer, and its handles and hit area flipped too. - `layer_quad` (handles, hit tests, marquee) is None for a layer reaching past the near plane, so nothing is placed or picked on a flipped quad. - `layer_outline` clips the box to the part in front of the near plane (Sutherland-Hodgman in homogeneous coordinates); the selection outline and the Extended Viewer use it. - The 3D axis gizmo's arrows are clipped the same way (`project_segment`). Tests: a box crossing the near plane keeps only its front part, one wholly behind draws nothing; gizmo segments are cut at the plane and never flip. Note: the reporter's exact setup (ellipse, X/Y Rotation, Orientation) wasn't reproduced in a headless probe with the default camera, where the layer stays in front of it; this fixes the projection fault that draws such lines. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QiAJeFttZp83Fh7YuzAR5f