Accessibility Analysis: faces a tool coming along a direction reaches (facing it, nothing above: a depth map of the model seen from that direction, tested per pixel on the GPU) shade green, the rest red; the analyses (zebra, draft, curvature map, environment map, accessibility, minimum radius, isocurves, curvature comb, center of mass) also on SOLID INSPECT, and Interference on sketch INSPECT; path patterns follow 3D sketch curves through the same path chain as sweeps (path_segments_3d folded into path_points)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/lib.rs

@@ -178,6 +178,9 @@ pub enum SurfaceAnalysis {
     Curvature { radius: f64 },
     /// Mirror finish reflecting a studio (sky, horizon, floor, light panels).
     Environment,
+    /// Green where a tool coming along `dir` reaches the face (facing it, nothing above), red
+    /// elsewhere.
+    Access { dir: Vec3 },
 }
 
 const MAX_UNDO: usize = 200;