坏电视信号

Build an EffectComposer chain with three small custom passes. First, a distortion pass that offsets each row's x coordinate by a mix of coarse and fine 1D noise of (y + time), plus a rolling vertical offset. Second, an RGB split that samples red and blue channels with opposite small offsets. Third, a film pass adding per-pixel hash noise and a sin(y * lineCount) scanline darkening. Expose all amplitudes as GUI sliders so the look can range from subtle to broken.