Function UpdateEmitters

demo/main.cpp:1008–1093

}

void UpdateEmitters()
{
	float spin = DegToRad(15.0f);

	const Vec3 forward(-sinf(g_camAngle.x + spin)*cosf(g_camAngle.y), sinf(g_camAngle.y), -cosf(g_camAngle.x + spin)*cosf(g_camAngle.y));
	const Vec3 right(Normalize(Cross(forward, Vec3(0.0f, 1.0f, 0.0f))));

	g_emitters[0].mDir = Normalize(forward + Vec3(0.0, 0.4f, 0.0f));
	g_emitters[0].mRight = right;
	g_emitters[0].mPos = g_camPos + forward*1.f + Vec3(0.0f, 0.2f, 0.0f) + right*0.65f;

	// process emitters
	if (g_emit)
	{
		int activeCount = NvFlexGetActiveCount(g_flex);

		size_t e = 0;

		// skip camera emitter when moving forward or things get messy
		if (g_camSmoothVel.z >= 0.025f)
			e = 1;

		for (; e < g_emitters.size(); ++e)
		{
			if (!g_emitters[e].mEnabled)
				continue;

			Vec3 emitterDir = g_emitters[e].mDir;
			Vec3 emitterRight = g_emitters[e].mRight;
			Vec3 emitterPos = g_emitters[e].mPos;

			float r;
			int phase;

			if (g_params.fluid)
			{
				r = g_params.fluidRestDistance;
				phase = NvFlexMakePhase(0, eNvFlexPhaseSelfCollide | eNvFlexPhaseFluid);
			}
			else
			{
				r = g_params.solidRestDistance;
				phase = NvFlexMakePhase(0, eNvFlexPhaseSelfCollide);
			}

			float numParticles = (g_emitters[e].mSpeed / r)*g_dt;

			// whole number to emit
			int n = int(numParticles + g_emitters[e].mLeftOver);

			if (n)
				g_emitters[e].mLeftOver = (numParticles + g_emitters[e].mLeftOver) - n;
			else
				g_emitters[e].mLeftOver += numParticles;

			// create a grid of particles (n particles thick)
			for (int k = 0; k < n; ++k)
			{