Reported: once extruded, a part is hard to read; the lighting says
little about its shape. Both lights of the object shaders sit near the
camera, so the sides of a part come out in almost the same tone, and
nothing marks where one face ends and the next begins.
- The phong shader gains a studio lighting model, chosen by a new
lighting_model uniform: a sky/ground hemisphere in world space (up
faces cool and bright, down faces warm and dark), a key light from the
upper left and a weak fill from the right, a plastic-like highlight,
and a darker base with a faint sheen toward the silhouette so curved
faces read as round. GLCanvas3D::set_studio_lighting() makes a canvas
draw its objects with it whatever the realistic-view preferences; only
the Design canvas turns it on. Every canvas sets the uniform on each
use, 0 for the slicer's, so they render as before.
- Every B-rep edge of a body is drawn as a thin dark line over it, depth
tested and pulled a few pixels toward the eye so it wins against the
faces meeting at it and hides behind the faces in front. The seam of a
closed surface and degenerate edges are left out
(GeometryEngine::display_edges). Edges are sampled once per shape and
kept across recomputes that leave a body unchanged; bodies faded by
body focus get fainter edges, and a dress-up previewing its result
alone hides them with the bodies.
Tests: display_edges gives a box its 12 edges at their lengths, a
cylinder its two round rims without the seam, a cone its base rim
without the seam or the apex.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QK4VgguuCAk2hZLWgcjJb9
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