Function UpdateMouse

demo/main.cpp:1104–1157

}

void UpdateMouse()
{
	// mouse button is up release particle
	if (g_lastb == -1)
	{
		if (g_mouseParticle != -1)
		{
			// restore particle mass
			g_buffers->positions[g_mouseParticle].w = g_mouseMass;

			// deselect
			g_mouseParticle = -1;
		}
	}

	// mouse went down, pick new particle
	if (g_mousePicked)
	{
		assert(g_mouseParticle == -1);

		Vec3 origin, dir;
		GetViewRay(g_lastx, g_screenHeight - g_lasty, origin, dir);

		const int numActive = NvFlexGetActiveCount(g_flex);

		g_mouseParticle = PickParticle(origin, dir, &g_buffers->positions[0], &g_buffers->phases[0], numActive, g_params.radius*0.8f, g_mouseT);

		if (g_mouseParticle != -1)
		{
			printf("picked: %d, mass: %f v: %f %f %f\n", g_mouseParticle, g_buffers->positions[g_mouseParticle].w, g_buffers->velocities[g_mouseParticle].x, g_buffers->velocities[g_mouseParticle].y, g_buffers->velocities[g_mouseParticle].z);

			g_mousePos = origin + dir*g_mouseT;
			g_mouseMass = g_buffers->positions[g_mouseParticle].w;
			g_buffers->positions[g_mouseParticle].w = 0.0f;		// increase picked particle's mass to force it towards the point
		}

		g_mousePicked = false;
	}

	// update picked particle position
	if (g_mouseParticle != -1)
	{
		Vec3 p = Lerp(Vec3(g_buffers->positions[g_mouseParticle]), g_mousePos, 0.8f);
		Vec3 delta = p - Vec3(g_buffers->positions[g_mouseParticle]);

		g_buffers->positions[g_mouseParticle].x = p.x;
		g_buffers->positions[g_mouseParticle].y = p.y;
		g_buffers->positions[g_mouseParticle].z = p.z;

		g_buffers->velocities[g_mouseParticle].x = delta.x / g_dt;
		g_buffers->velocities[g_mouseParticle].y = delta.y / g_dt;
		g_buffers->velocities[g_mouseParticle].z = delta.z / g_dt;
	}
}

void UpdateWind()
{