From a3e769a2a8d6f04fdae4e97d2a39d45e1cb062b8 Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Mon, 26 Oct 2026 16:20:05 +0100
Subject: ESP: restrict skeleton to humanoid core bones (no
 fingers/toes/headcrab)

---
 src/bones.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'src/bones.cpp')

diff --git a/src/bones.cpp b/src/bones.cpp
index 88aa429..a9c6887 100644
--- a/src/bones.cpp
+++ b/src/bones.cpp
@@ -182,6 +182,25 @@ static bool hitbox_world(const BoneEntry *e, const Hitbox &b, Vector &out) {
   return true;
 }
 
+// HL2 humanoids (combine, metrocop, citizen, zombie, ...) use the ValveBiped
+// skeleton. Draw only the core chain: pelvis/spine/neck/head, clavicle to
+// hand, thigh to foot. Fingers, toes and extra model bones (e.g. the headcrab
+// on a zombie) are skipped.
+static bool core_bone_name(const char *n) {
+  if (!n || strncasecmp(n, "ValveBiped.Bip01_", 17) != 0)
+    return false;
+  if (contains_ci(n, "Finger") || contains_ci(n, "Toe") ||
+      contains_ci(n, "Headcrab"))
+    return false;
+  static const char *tokens[] = {"Pelvis",   "Spine",  "Neck",  "Head1",
+                                 "Clavicle", "UpperArm", "Forearm", "Hand",
+                                 "Thigh",    "Calf",   "Foot",  nullptr};
+  for (int i = 0; tokens[i]; i++)
+    if (contains_ci(n, tokens[i]))
+      return true;
+  return false;
+}
+
 static void dump_hitboxes(const BoneEntry *e) {
   const StudioHdr *h = e->hdr;
   logf("hitbox dump: idx=%d sets=%d setidx=%d", e->idx, h->numhitboxsets,
@@ -312,6 +331,26 @@ int bone_parent(int idx, int bone) {
   return bone_at(e->hdr, bone)->parent;
 }
 
+bool bone_is_skeleton_core(int idx, int bone) {
+  BoneEntry *e = find_entry(idx);
+  if (!e || !e->valid || bone < 0 || bone >= e->count)
+    return false;
+  return core_bone_name(bone_name_raw(e->hdr, bone));
+}
+
+int bone_nearest_core_parent(int idx, int bone) {
+  BoneEntry *e = find_entry(idx);
+  if (!e || !e->valid || bone < 0 || bone >= e->count)
+    return -1;
+  int p = bone_at(e->hdr, bone)->parent;
+  for (int guard = 0; p >= 0 && p < e->count && guard < 64; guard++) {
+    if (core_bone_name(bone_name_raw(e->hdr, p)))
+      return p;
+    p = bone_at(e->hdr, p)->parent;
+  }
+  return -1;
+}
+
 bool bone_pos(int idx, int bone, Vector &out) {
   BoneEntry *e = find_entry(idx);
   if (!e || !e->valid || bone < 0 || bone >= e->count)
-- 
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