1 files changed, 92 insertions, 0 deletions
diff --git a/demo/scenes/forcefield.h b/demo/scenes/forcefield.h
new file mode 100644
index 0000000..1ffcd12
--- /dev/null
+++ b/demo/scenes/forcefield.h
@@ -0,0 +1,92 @@
+
+
+class ForceField : public Scene
+{
+public:
+
+
+	ForceField(const char* name) : Scene(name)
+	{
+	}
+
+	virtual void Initialize()
+	{
+		const float radius = 0.01f;
+		const int phase = NvFlexMakePhase(0, eNvFlexPhaseSelfCollide);
+
+		CreateParticleGrid(Vec3(-1.0f, radius, 0.0f), 200, 6, 50, radius*0.5f, Vec3(0.0f), 1.0f, false, 0.0f, phase);
+
+		g_params.radius = radius*1.0f;
+		g_params.dynamicFriction = 0.4f;
+		g_params.staticFriction = 0.4f;
+		g_params.particleFriction = 0.25f;
+		g_params.dissipation = 0.0f;
+		g_params.numIterations = 2;
+		g_params.viscosity = 0.0f;
+
+		g_numSubsteps = 2;
+
+		// draw options
+		g_drawPoints = true;
+
+		callback = NULL;
+
+	}
+
+	virtual void PostInitialize()
+	{
+		// free previous callback, todo: destruction phase for tests
+		if (callback)
+			NvFlexExtDestroyForceFieldCallback(callback);
+
+		// create new callback
+		callback = NvFlexExtCreateForceFieldCallback(g_flex);
+
+		// expand scene bounds to include force field
+		g_sceneLower -= Vec3(1.0f);
+		g_sceneUpper += Vec3(1.0f);
+	}
+
+	void DrawCircle(const Vec3& pos, const Vec3& u, const Vec3& v, float radius, int segments)
+	{
+		BeginLines();
+		
+		Vec3 start = pos + radius*v;
+
+		for (int i=1; i <=segments; ++i)
+		{
+			float theta = k2Pi*(float(i)/segments);
+			Vec3 end = pos + radius*sinf(theta)*u + radius*cosf(theta)*v;
+
+			DrawLine(start, end, Vec4(1.0f));
+
+			start = end;
+		}
+
+		EndLines();
+	}
+
+	virtual void Draw(int phase)
+	{
+		DrawCircle(forcefield.mPosition, Vec3(1.0f, 0.0f, 0.0f), Vec3(0.0f, 1.0f, 0.0f), forcefield.mRadius, 20);
+		DrawCircle(forcefield.mPosition, Vec3(0.0f, 0.0f, 1.0f), Vec3(0.0f, 1.0f, 0.0f), forcefield.mRadius, 20);
+	}
+
+	virtual void Update()
+	{
+		float time = g_frame*g_dt;
+
+		(Vec3&)forcefield.mPosition = Vec3((sinf(time)), 0.5f, 0.0f);
+		forcefield.mRadius = (sinf(time*1.5f)*0.5f + 0.5f);
+		forcefield.mStrength = -30.0f;
+		forcefield.mMode = eNvFlexExtModeForce;
+		forcefield.mLinearFalloff = true;
+
+		NvFlexExtSetForceFields(callback, &forcefield, 1);
+	}
+
+	NvFlexExtForceField forcefield;
+
+	NvFlexExtForceFieldCallback* callback;
+
+};
+\ No newline at end of file