Fix particles being animated twice in stereo render, see #43

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

@@ -827,6 +827,7 @@ private:
 	// common vb for water display
 	CVertexBuffer	 _WaterVB;
 	
+	bool			_RequestParticlesAnimate;
 
 };
 

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

@@ -191,6 +191,8 @@ CScene::CScene(bool bSmallScene) : LightTrav(bSmallScene)
 	_WaterEnvMap = NULL;
 
 	_GlobalSystemTime= 0.0;
+
+	_RequestParticlesAnimate = false;
 }
 // ***************************************************************************
 void	CScene::release()
@@ -381,6 +383,9 @@ void	CScene::endPartRender()
 	drv->activeVertexProgram(NULL);
 	drv->activePixelProgram(NULL);
 
+	// Ensure nothing animates on subsequent renders
+	_EllapsedTime = 0.f;
+
 	/*
 	uint64 total = PSStatsRegisterPSModelObserver +
 				  PSStatsRemovePSModelObserver +
@@ -617,7 +622,11 @@ void	CScene::renderPart(UScene::TRenderPart rp, bool	doHrcPass)
 		// loadBalance
 		LoadBalancingTrav.traverse();
 		//
-		_ParticleSystemManager.processAnimate(_EllapsedTime); // deals with permanently animated particle systems
+		if (_RequestParticlesAnimate)
+		{
+			_ParticleSystemManager.processAnimate(_EllapsedTime); // deals with permanently animated particle systems
+			_RequestParticlesAnimate = false;
+		}
 		// Light
 		LightTrav.traverse();
 	}
@@ -863,6 +872,9 @@ void CScene::animate( TGlobalAnimationTime atTime )
 
 	// Rendered part are invalidate
 	_RenderedPart = UScene::RenderNothing;
+
+	// Particles are animated later due to dependencies
+	_RequestParticlesAnimate = true;
 }
 
 

code/snowballs2/client/src/camera.cpp

@@ -219,7 +219,8 @@ void releaseSky()
 // -- -- random note: update and render makes more sense than animate and update
 void animateSky(double dt)
 {
-	if (!StereoDisplay) Clouds->anim(dt);
+	if (!StereoHMD) Clouds->anim(dt);
+	SkyScene->animate(AnimationTime);
 }
 
 // this is actually render
@@ -232,7 +233,6 @@ void updateSky()
 	skyCameraMatrix.setPos(CVector::Null);
 	SkyCamera.setMatrix(skyCameraMatrix);
 
-	SkyScene->animate(AnimationTime);
 	SkyScene->render();
 	// Must clear ZBuffer For incoming rendering.
 	Driver->clearZBuffer();