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@@ -278,6 +278,25 @@ vocabulary / decisions.
   visible corner. Each edge is clipped at the camera near plane and then to the
   screen, so a box straddling the camera still draws its visible portions.
 
+## Chams
+
+- Hooks `IVModelRender::DrawModelExecute` (slot 19 in `VEngineModel016`).
+  The model's entity is `ModelRenderInfo_t::entity_index` (32-bit offset 0x30);
+  only entities for which `esp_is_npc_index` says the client class is an NPC
+  are affected.
+- Uses `IVModelRender::ForcedMaterialOverride` (slot 1) with
+  `models/debug/debugwhite` and draws twice: first with
+  `MATERIAL_VAR_IGNOREZ` (1 << 15) set through `IMaterial::SetMaterialVarFlag`
+  (slot 29) for the through-wall pass, then without it. `IMaterial::
+  ColorModulate` (slot 28) applies the configured colour. The shared material's
+  flag and colour are restored to (false, white) after the draw.
+- Material lookup walks the `IMaterialSystem` list (`world_find_material`), with
+  `FindMaterial` (slot 71) as the fallback for a not-yet-resident material.
+- Feature is off by default; `[chams] active/bind/walls/r/g/b`, with a
+  "Through walls" toggle and colour picker in the Visuals card.
+- This is a flat material override, not stencil outlines; depth handling is
+  the simple ignorez/normal two-pass.
+
 ## Bones / ESP
 
 - `SetupBones(BONE_USED_BY_ANYTHING)` with engine `Time()`; studio header via