x_i vs. x_star

[jenzou]

Fluid-Simulator/simulator/code/Assignment2/ParticleSystem.cpp

Line 140 in e3fc0bb

double density_term = poly6((p_i.x_star - neighbor.x_star).length()) / poly6(TENSILE_DELTA_Q);

After changing all x_i to x_star, particles disappear after running simulation -- I'm unsure why this is happening.