Fix regression from stereo branch in wind tree

code/nel/include/nel/3d/render_trav.h

@@ -280,7 +280,8 @@ public:
 	 */
 	void		changeLightSetup(CLightContribution	*lightContribution, bool useLocalAttenuation);
 
-
+	/// Must call before beginVPLightSetup
+	void		prepareVPLightSetup();
 	/** setup the driver VP constants to get info from current LightSetup.
 	 *	Only 0..3 Light + SunLights are supported. The VP do NOT support distance/Spot attenuation
 	 *	Also it does not handle World Matrix with non uniform scale correctly since lighting is made in ObjectSpace
@@ -425,7 +426,7 @@ private:
 	// Current num of VP lights enabled.
 	uint						_VPNumLights;
 	// Current support of specular
-	//bool						_VPSupportSpecular;
+	// bool						_VPSupportSpecular;
 	// Sum of all ambiant of all lights + ambiantGlobal.
 	NLMISC::CRGBAF				_VPFinalAmbient;
 	// Diffuse/Spec comp of all light / 255.

code/nel/src/3d/meshvp_per_pixel_light.cpp

@@ -515,6 +515,7 @@ bool	CMeshVPPerPixelLight::begin(IDriver *drv,
 	//
 	CRenderTrav		*renderTrav= &scene->getRenderTrav();
 	/// Setup for gouraud lighting
+	renderTrav->prepareVPLightSetup();
 	renderTrav->beginVPLightSetup(program, invertedModelMat);
 	//
 	sint strongestLightIndex = renderTrav->getStrongestLightIndex();

code/nel/src/3d/meshvp_wind_tree.cpp

@@ -385,6 +385,8 @@ bool	CMeshVPWindTree::begin(IDriver *driver, CScene *scene, CMeshBaseInstance *m
 	// Activate the good VertexProgram
 	//===============
 
+	// Update nb vp lights
+	renderTrav->prepareVPLightSetup();
 
 	// Get how many pointLights are setuped now.
 	nlassert(scene != NULL);
@@ -510,6 +512,9 @@ void	CMeshVPWindTree::beginMBRMesh(IDriver *driver, CScene *scene)
 // ***************************************************************************
 void	CMeshVPWindTree::beginMBRInstance(IDriver *driver, CScene *scene, CMeshBaseInstance *mbi, const NLMISC::CMatrix &invertedModelMat)
 {
+	// Update nb vp lights
+	renderTrav->prepareVPLightSetup();
+
 	// Get how many pointLights are setuped now.
 	nlassert(scene != NULL);
 	CRenderTrav		*renderTrav= &scene->getRenderTrav();

code/nel/src/3d/render_trav.cpp

@@ -760,13 +760,20 @@ void		CRenderTrav::changeLightSetup(CLightContribution	*lightContribution, bool
 // ***************************************************************************
 // ***************************************************************************
 
+void		CRenderTrav::prepareVPLightSetup()
+{
+	nlassert(MaxVPLight==4);
+	_VPNumLights= min(_NumLightEnabled, (uint)MaxVPLight);
+	// Must force real light setup at least the first time, in changeVPLightSetupMaterial()
+	_VPMaterialCacheDirty= true;
+}
 
 // ***************************************************************************
 void		CRenderTrav::beginVPLightSetup(CVertexProgramLighted *program, const CMatrix &invObjectWM)
 {
 	uint	i;
-	nlassert(MaxVPLight==4);
-	_VPNumLights= min(_NumLightEnabled, (uint)MaxVPLight);
+	// nlassert(MaxVPLight==4);
+	// _VPNumLights= min(_NumLightEnabled, (uint)MaxVPLight);
 	// _VPCurrentCtStart= ctStart;
 	// _VPSupportSpecular= supportSpecular;
 	_VPCurrent = program;