A shape with scene3d and sp3d but no bevelT was drawn in its flat fill
colour. PowerPoint lights the front face from the light rig whether or
not there is a bevel, so a plain 3-D rotated rectangle is lighter than
its fill. Model the face with the same threePt approximation as the
bevel (no rim), for solid fills.
Wild 3-D slides: s8 6.35 -> 4.26, s9 19.74 -> 17.68. Corpus unchanged
except lo tdf114848 s4 2.13 -> 1.94.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A shape with a top bevel seen through a 3-D scene drew flat. Fitted to
PowerPoint's export of the bevel presets on a solid fill with the default
three-point light rig and matte material, DeckCraft now lights the face
and a band as wide as the bevel inside the outline as surfaces: Lambert
light from the upper left (azimuth 240, 45 degrees up), c * (0.453 +
0.731 * n.L) + 14.7 per channel, the band's normal tilting outwards by
the profile's slope (quarter circle by default, straight for angle).
Within about 15 grey levels RMS of PowerPoint on the circle bevel; other
profiles use the circle's, pictures get light and dark veils, and other
light rigs and materials (and anything without a scene) stay flat.
Wild synthetic set: bevel presets slide 5.20 -> 2.48, materials/rigs
13.25 -> 12.73.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Nikita Rakitin