diff --git a/src/core/whitebox-selection-feedback.ts b/src/core/whitebox-selection-feedback.ts
new file mode 100644
index 00000000..fc183fd5
--- /dev/null
+++ b/src/core/whitebox-selection-feedback.ts
@@ -0,0 +1,33 @@
+import type { EditorSelection } from "./selection";
+import {
+  BOX_EDGE_LABELS,
+  BOX_FACE_LABELS,
+  BOX_VERTEX_LABELS
+} from "../document/brushes";
+import type { SceneDocument } from "../document/scene-document";
+
+function getBrushDisplayLabel(document: SceneDocument, brushId: string): string {
+  const brushes = Object.values(document.brushes);
+  const brushIndex = brushes.findIndex((brush) => brush.id === brushId);
+
+  if (brushIndex === -1) {
+    return "Whitebox Box";
+  }
+
+  return brushes[brushIndex].name ?? `Whitebox Box ${brushIndex + 1}`;
+}
+
+export function getWhiteboxSelectionFeedbackLabel(document: SceneDocument, selection: EditorSelection): string | null {
+  switch (selection.kind) {
+    case "brushes":
+      return selection.ids.length === 1 ? `Solid · ${getBrushDisplayLabel(document, selection.ids[0])}` : null;
+    case "brushFace":
+      return `Face · ${BOX_FACE_LABELS[selection.faceId]} · ${getBrushDisplayLabel(document, selection.brushId)}`;
+    case "brushEdge":
+      return `Edge · ${BOX_EDGE_LABELS[selection.edgeId]} · ${getBrushDisplayLabel(document, selection.brushId)}`;
+    case "brushVertex":
+      return `Vertex · ${BOX_VERTEX_LABELS[selection.vertexId]} · ${getBrushDisplayLabel(document, selection.brushId)}`;
+    default:
+      return null;
+  }
+}
diff --git a/src/geometry/box-brush-components.ts b/src/geometry/box-brush-components.ts
new file mode 100644
index 00000000..40c38a99
--- /dev/null
+++ b/src/geometry/box-brush-components.ts
@@ -0,0 +1,102 @@
+import { Euler, MathUtils, Vector3 } from "three";
+
+import type { Vec3 } from "../core/vector";
+import {
+  type BoxBrush,
+  type BoxEdgeId,
+  type BoxVertexId
+} from "../document/brushes";
+import { getBoxBrushHalfSize } from "./box-brush";
+
+type Sign = -1 | 1;
+
+interface BoxVertexSigns {
+  x: Sign;
+  y: Sign;
+  z: Sign;
+}
+
+const BOX_VERTEX_SIGNS: Record<BoxVertexId, BoxVertexSigns> = {
+  negX_negY_negZ: { x: -1, y: -1, z: -1 },
+  posX_negY_negZ: { x: 1, y: -1, z: -1 },
+  negX_posY_negZ: { x: -1, y: 1, z: -1 },
+  posX_posY_negZ: { x: 1, y: 1, z: -1 },
+  negX_negY_posZ: { x: -1, y: -1, z: 1 },
+  posX_negY_posZ: { x: 1, y: -1, z: 1 },
+  negX_posY_posZ: { x: -1, y: 1, z: 1 },
+  posX_posY_posZ: { x: 1, y: 1, z: 1 }
+};
+
+const BOX_EDGE_VERTEX_IDS: Record<BoxEdgeId, { start: BoxVertexId; end: BoxVertexId }> = {
+  edgeX_negY_negZ: { start: "negX_negY_negZ", end: "posX_negY_negZ" },
+  edgeX_posY_negZ: { start: "negX_posY_negZ", end: "posX_posY_negZ" },
+  edgeX_negY_posZ: { start: "negX_negY_posZ", end: "posX_negY_posZ" },
+  edgeX_posY_posZ: { start: "negX_posY_posZ", end: "posX_posY_posZ" },
+  edgeY_negX_negZ: { start: "negX_negY_negZ", end: "negX_posY_negZ" },
+  edgeY_posX_negZ: { start: "posX_negY_negZ", end: "posX_posY_negZ" },
+  edgeY_negX_posZ: { start: "negX_negY_posZ", end: "negX_posY_posZ" },
+  edgeY_posX_posZ: { start: "posX_negY_posZ", end: "posX_posY_posZ" },
+  edgeZ_negX_negY: { start: "negX_negY_negZ", end: "negX_negY_posZ" },
+  edgeZ_posX_negY: { start: "posX_negY_negZ", end: "posX_negY_posZ" },
+  edgeZ_negX_posY: { start: "negX_posY_negZ", end: "negX_posY_posZ" },
+  edgeZ_posX_posY: { start: "posX_posY_negZ", end: "posX_posY_posZ" }
+};
+
+export interface BoxBrushEdgeWorldSegment {
+  id: BoxEdgeId;
+  start: Vec3;
+  end: Vec3;
+  center: Vec3;
+}
+
+function createBrushRotationEuler(brush: BoxBrush): Euler {
+  return new Euler(
+    MathUtils.degToRad(brush.rotationDegrees.x),
+    MathUtils.degToRad(brush.rotationDegrees.y),
+    MathUtils.degToRad(brush.rotationDegrees.z),
+    "XYZ"
+  );
+}
+
+export function transformBoxBrushLocalPointToWorld(brush: BoxBrush, localPoint: Vec3): Vec3 {
+  const rotation = createBrushRotationEuler(brush);
+  const rotatedOffset = new Vector3(localPoint.x, localPoint.y, localPoint.z).applyEuler(rotation);
+
+  return {
+    x: brush.center.x + rotatedOffset.x,
+    y: brush.center.y + rotatedOffset.y,
+    z: brush.center.z + rotatedOffset.z
+  };
+}
+
+export function getBoxBrushVertexLocalPosition(brush: BoxBrush, vertexId: BoxVertexId): Vec3 {
+  const halfSize = getBoxBrushHalfSize(brush);
+  const signs = BOX_VERTEX_SIGNS[vertexId];
+
+  return {
+    x: signs.x * halfSize.x,
+    y: signs.y * halfSize.y,
+    z: signs.z * halfSize.z
+  };
+}
+
+export function getBoxBrushVertexWorldPosition(brush: BoxBrush, vertexId: BoxVertexId): Vec3 {
+  return transformBoxBrushLocalPointToWorld(brush, getBoxBrushVertexLocalPosition(brush, vertexId));
+}
+
+export function getBoxBrushEdgeWorldSegment(brush: BoxBrush, edgeId: BoxEdgeId): BoxBrushEdgeWorldSegment {
+  const vertexIds = BOX_EDGE_VERTEX_IDS[edgeId];
+  const start = getBoxBrushVertexWorldPosition(brush, vertexIds.start);
+  const end = getBoxBrushVertexWorldPosition(brush, vertexIds.end);
+
+  return {
+    id: edgeId,
+    start,
+    end,
+    center: {
+      x: (start.x + end.x) * 0.5,
+      y: (start.y + end.y) * 0.5,
+      z: (start.z + end.z) * 0.5
+    }
+  };
+}