Fix extruded solid grip preview and taper range

src/scene/mod.rs

@@ -1476,6 +1476,9 @@ pub struct Scene {
     pub selection_filter: HashSet<String>,
     /// In-progress preview wires while a command is active (rubber-band + object ghosts).
     pub preview_wires: Vec<WireModel>,
+    /// Candidate wireframes produced by editable solid-history grips. The
+    /// resident body remains untouched until the grip is committed.
+    solid_history_preview_wires: HashMap<Handle, Vec<WireModel>>,
     /// Live hatch fill used by interactive edits such as dragging the pattern
     /// origin grip. Kept separate from the resident hatch set so moving one
     /// pattern never re-uploads every hatch in a large drawing.
@@ -1883,6 +1886,7 @@ impl Scene {
             model_lineweight_scale: 1.0,
             selection_filter: HashSet::default(),
             preview_wires: vec![],
+            solid_history_preview_wires: HashMap::default(),
             preview_hatches: Arc::new(Vec::new()),
             preview_text: vec![],
             interim_wire: None,

src/scene/model/solid_history.rs

@@ -2314,7 +2314,7 @@ fn apply_extrusion_draft_grip(value: &mut SolidHistorySweep, apply: GripApply) -
     let GripApply::Absolute(world) = apply else {
         return false;
     };
-    let Some((_, base_top, radial, profile_radius, height)) = extrusion_draft_grip(value) else {
+    let Some((_, base_top, radial, _, height)) = extrusion_draft_grip(value) else {
         return false;
     };
     let top_offset = (world - base_top).dot(radial);
@@ -2322,10 +2322,27 @@ fn apply_extrusion_draft_grip(value: &mut SolidHistorySweep, apply: GripApply) -
         return false;
     }
     let limit = 89.0_f64.to_radians();
-    let inward_limit = ((profile_radius - 1e-6).max(1e-6) / height)
-        .atan()
-        .min(limit);
-    let angle = (-top_offset).atan2(height).clamp(-limit, inward_limit);
+    let desired = (-top_offset).atan2(height).clamp(-limit, limit);
+    let angle = if desired > 0.0 && !extrusion_draft_rebuilds(value, desired) {
+        // The maximum inset is profile-dependent. A corner radius is too
+        // restrictive for many outlines, while allowing the pointer through
+        // a collapsed outline makes the top grow again. Search the actual
+        // rebuild boundary so every supported profile reaches its smallest
+        // valid top without crossing into an inverted result.
+        let mut valid = 0.0;
+        let mut invalid = limit;
+        for _ in 0..16 {
+            let candidate = (valid + invalid) * 0.5;
+            if extrusion_draft_rebuilds(value, candidate) {
+                valid = candidate;
+            } else {
+                invalid = candidate;
+            }
+        }
+        valid
+    } else {
+        desired
+    };
     if !angle.is_finite() || (angle - value.draft_angle).abs() <= 1e-12 {
         return false;
     }
@@ -2333,6 +2350,12 @@ fn apply_extrusion_draft_grip(value: &mut SolidHistorySweep, apply: GripApply) -
     true
 }
 
+fn extrusion_draft_rebuilds(value: &SolidHistorySweep, angle: f64) -> bool {
+    let mut candidate = value.clone();
+    candidate.draft_angle = angle;
+    cadkernel::acis::rebuild_body(&SolidHistoryOperation::Extrusion(candidate)).is_ok()
+}
+
 fn grip(
     id: usize,
     world: glam::DVec3,

src/scene/model/solid_model.rs

@@ -3,6 +3,7 @@
 use cadkernel::brep::{self, Body, Curve3, EdgeKey, FaceKey, Surface};
 
 use crate::scene::model::mesh_model::{MeshLodSet, MeshModel};
+use crate::scene::model::wire_model::WireModel;
 
 /// What counts as the same point when the kernel checks a body over.
 const TOL: f64 = 1e-9;
@@ -243,6 +244,27 @@ pub fn edge_wires(body: &Body) -> Vec<acadrust::entities::Wire> {
         .collect()
 }
 
+/// White wireframe used while a solid-history grip is hot.
+///
+/// This deliberately does not touch the resident solid mesh or its entity
+/// wires: the selected source stays visible in blue while the candidate body
+/// is presented as a separate, non-pickable outline until placement.
+pub fn grip_preview_wires(body: &Body, handle: acadrust::Handle) -> Vec<WireModel> {
+    tessellation(body)
+        .edges
+        .into_iter()
+        .filter(|edge| edge.positions.len() >= 2)
+        .map(|edge| {
+            WireModel::solid_f64(
+                format!("{}-GRIP-PREVIEW", handle.value()),
+                edge.positions,
+                WireModel::WHITE,
+                false,
+            )
+        })
+        .collect()
+}
+
 /// B-rep edge nearest a world-space surface pick.
 pub fn nearest_edge(body: &Body, pick: [f64; 3]) -> Option<EdgeKey> {
     let pick = cadkernel::space::Vec3::from(pick);

src/scene/modify.rs

@@ -841,6 +841,7 @@ impl Scene {
         handle: Handle,
         operation: acadrust::objects::SolidHistoryOperation,
     ) -> bool {
+        self.solid_history_preview_wires.remove(&handle);
         let Ok(body) = cadkernel::acis::rebuild_body(&operation) else {
             return false;
         };
@@ -879,6 +880,7 @@ impl Scene {
         };
         entity.set_sat_document(&document);
         self.sync_solid_reference_point(handle);
+        self.solid_history_preview_wires.remove(&handle);
         self.register_solid_model(handle, body);
         true
     }
@@ -901,7 +903,10 @@ impl Scene {
         let Some(EntityType::Solid3D(_)) = self.document.get_entity(handle) else {
             return false;
         };
-        self.register_solid_model(handle, body);
+        self.solid_history_preview_wires.insert(
+            handle,
+            crate::scene::model::solid_model::grip_preview_wires(&body, handle),
+        );
         true
     }
 

src/scene/preview.rs

@@ -272,6 +272,7 @@ impl Scene {
         // flips the wire content id back to the base tessellation id, which
         // re-uploads the base wires (without the preview) on the next frame.
         self.preview_wires = vec![];
+        self.solid_history_preview_wires.clear();
         if !self.preview_hatches.is_empty() {
             self.preview_hatches = std::sync::Arc::new(Vec::new());
         }
@@ -302,6 +303,21 @@ impl Scene {
             .collect()
     }
 
+    /// Current candidate geometry for a hot grip. Solid-history candidates
+    /// live outside the document until placement; ordinary entities continue
+    /// to use their current tessellation.
+    pub fn grip_wire_models_for(&self, handles: &[acadrust::Handle]) -> Vec<WireModel> {
+        handles
+            .iter()
+            .flat_map(|handle| {
+                self.solid_history_preview_wires
+                    .get(handle)
+                    .cloned()
+                    .unwrap_or_else(|| self.wire_models_for(std::slice::from_ref(handle)))
+            })
+            .collect()
+    }
+
     /// Split a MIRROR selection into plain ghost wires (reflected wholesale) and
     /// text ghosts paired with their bounding-box centre. Lets the preview match
     /// the commit for TEXT: MIRRTEXT on → true glyph mirror (full reflection, same