The plane is now taken from the background for the integration as well as the shadow mask, and the
degree (0.99 by default against the 0.998 passed) moves neither the mask nor R_free beyond 0.0001.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
(cherry picked from commit ebf0f24351cf45c5e3d7aefeae1e5df83ff0fd55)