1 files changed, 21 insertions, 5 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 5eca9f8..2199be6 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -329,11 +329,27 @@ vocabulary / decisions.
   already-loaded `materialsystem.so` and walk every material with
   `FirstMaterial` / `NextMaterial` / `GetMaterial`.
 - `IMaterial::ColorModulate(r,g,b)` is applied to materials whose
-  `GetTextureGroupName()` is `World textures` (sky names excluded), to
-  `SkyBox textures` (or names containing `sky`), and to prop materials whose
-  name starts with `models/props` (static props and prop_physics share those
-  model materials; NPC/player/weapon materials are excluded). Lightmaps are
-  not touched.
+  `GetTextureGroupName()` is `World textures` (sky names excluded) and to
+  `SkyBox textures` (or names containing `sky`). Lightmaps are not touched.
+- Props are NOT tinted through their materials: VertexLitGeneric materials get
+  their colour modulation from `IStudioRender`, which the engine sets per
+  model draw (white), so the material var is overridden. `src/studio.cpp`
+  hooks the `VStudioRender025` interface object instead:
+  `SetColorModulation`/`SetAlphaModulation` (slots 27/28), `DrawModel` (29),
+  `DrawModelStaticProp` (30) and `DrawModelArray` (46), all checked against
+  `CStudioRenderContext`'s vtable in `studiorender.so`.
+  `DrawModel` checks `DrawModelInfo_t::m_pStudioHdr->name`; note the name is
+  the short form with Windows separators (`props_junk\wood_crate002a.mdl`,
+  no `models/` prefix), so prop detection matches `props/`, `props\` and
+  `props_` after stripping `models/` (excluding `props_skybox`). For a prop it
+  sets the prop colour right before calling the original draw; setting the
+  colour from a flag inside the draw does not work because the engine calls
+  `SetColorModulation(1,1,1)` *before* `DrawModel`.
+  Do not force `SetAlphaModulation` there: the earlier attempt produced
+  error-material props and a material-system crash.
+- `prop_tint_update()` also writes `m_clrRender` on prop entities (dynamic
+  props) as a secondary path; the netvar resolver rejects offset 0 (an
+  embedded-table false positive) and only accepts 0x20..0x2000.
 - Slot map (2013 SDK layout, registered under `VMaterialSystem080`):
   `IMaterialSystem` 73/74/75/76/77 = First/Next/Invalid/Get/GetNumMaterials;
   `IMaterial` 0/1/28 = GetName/GetTextureGroupName/ColorModulate.