5 files changed, 16 insertions, 6 deletions
diff --git a/src/core/Clock.cpp b/src/core/Clock.cpp
index b391e508..b0f0b34f 100644
--- a/src/core/Clock.cpp
+++ b/src/core/Clock.cpp
@@ -20,6 +20,7 @@ uint16 CClock::ms_Stored_nGameClockSeconds;
 uint32 CClock::ms_nMillisecondsPerGameMinute;
 uint32  CClock::ms_nLastClockTick;
 bool   CClock::ms_bClockHasBeenStored;
+float  CClock::ms_EnvMapTimeMultiplicator;
 
 #ifndef MASTER
 bool gbFreezeTime;
@@ -35,6 +36,7 @@ CClock::Initialise(uint32 scale)
 	ms_nMillisecondsPerGameMinute = scale;
 	ms_nLastClockTick = CTimer::GetTimeInMilliseconds();
 	ms_bClockHasBeenStored = false;
+	ms_EnvMapTimeMultiplicator = 1.0f;
 	debug("CClock ready\n");
 #ifndef MASTER
 	VarConsole.Add("Time (hour of day)", &ms_nGameClockHours, 1, 0, 23, true);
@@ -136,3 +138,10 @@ CClock::RestoreClock(void)
 	ms_nGameClockMinutes = ms_Stored_nGameClockMinutes;
 	ms_nGameClockSeconds = ms_Stored_nGameClockSeconds;
 }
+
+void
+CClock::CalcEnvMapTimeMultiplicator(void)
+{
+	float nightness = Abs(ms_nGameClockHours/24.0f - 0.5f);
+	ms_EnvMapTimeMultiplicator = SQR(1.0f - nightness);;
+}
diff --git a/src/core/Clock.h b/src/core/Clock.h
index a611cd50..808e61f4 100644
--- a/src/core/Clock.h
+++ b/src/core/Clock.h
@@ -12,6 +12,7 @@ public:
 	static uint32 ms_nMillisecondsPerGameMinute;
 	static uint32 ms_nLastClockTick;
 	static bool   ms_bClockHasBeenStored;
+	static float  ms_EnvMapTimeMultiplicator;
 
 	static void Initialise(uint32 scale);
 	static void Update(void);
@@ -21,6 +22,8 @@ public:
 	static void StoreClock(void);
 	static void RestoreClock(void);
 
+	static void CalcEnvMapTimeMultiplicator(void);
+
 	static uint8 GetHours(void) { return ms_nGameClockHours; }
 	static uint8 GetMinutes(void) { return ms_nGameClockMinutes; }
 	static int16 GetSeconds(void) { return ms_nGameClockSeconds; }
diff --git a/src/core/main.cpp b/src/core/main.cpp
index 03a7fcc2..8685e42d 100644
--- a/src/core/main.cpp
+++ b/src/core/main.cpp
@@ -1143,10 +1143,10 @@ MattRenderScene(void)
 	/// CWorld::AdvanceCurrentScanCode();
 	// CMattRenderer::ResetRenderStates
 	/// CRenderer::ClearForFrame();		// before ConstructRenderList
-	// CClock::CalcEnvMapTimeMultiplicator
+	CClock::CalcEnvMapTimeMultiplicator();
 	RwRenderStateSet(rwRENDERSTATECULLMODE, (void*)rwCULLMODECULLNONE);
 	CWaterLevel::RenderWater();	// actually CMattRenderer::RenderWater
-	// CClock::ms_EnvMapTimeMultiplicator = 1.0f;
+	CClock::ms_EnvMapTimeMultiplicator = 1.0f;
 	// cWorldStream::ClearDynamics
 	/// CRenderer::ConstructRenderList();	// before PreRender
 if(gbRenderWorld0)
diff --git a/src/extras/custompipes_d3d9.cpp b/src/extras/custompipes_d3d9.cpp
index 2ea2ede0..5217462c 100644
--- a/src/extras/custompipes_d3d9.cpp
+++ b/src/extras/custompipes_d3d9.cpp
@@ -128,8 +128,7 @@ leedsVehicleRenderCB(rw::Atomic *atomic, rw::d3d9::InstanceDataHeader *header)
 
 		float coef = 0.0f;
 		if(RpMatFXMaterialGetEffects(m) == rpMATFXEFFECTENVMAP)
-			coef = RpMatFXMaterialGetEnvMapCoefficient(m);
-		coef *= 0.5f;
+			coef = CClock::ms_EnvMapTimeMultiplicator * RpMatFXMaterialGetEnvMapCoefficient(m)*0.5f;
 		if(bChromeCheat && coef > 0.0f)
 			coef = 1.0f;
 		d3ddevice->SetPixelShaderConstantF(PSLOC_shininess, (float*)&coef, 1);
diff --git a/src/extras/custompipes_gl.cpp b/src/extras/custompipes_gl.cpp
index 19e37ac1..10c7fac3 100644
--- a/src/extras/custompipes_gl.cpp
+++ b/src/extras/custompipes_gl.cpp
@@ -135,8 +135,7 @@ leedsVehicleRenderCB(rw::Atomic *atomic, rw::gl3::InstanceDataHeader *header)
 
 		float coef = 0.0f;
 		if(RpMatFXMaterialGetEffects(m) == rpMATFXEFFECTENVMAP)
-			coef = RpMatFXMaterialGetEnvMapCoefficient(m);
-		coef *= 0.5f;
+			coef = CClock::ms_EnvMapTimeMultiplicator * RpMatFXMaterialGetEnvMapCoefficient(m)*0.5f;
 		if(bChromeCheat && coef > 0.0f)
 			coef = 1.0f;
 		glUniform1f(U(u_fxparams), coef);