Hi Joyhop,
Thank you for your question and support!
Eliminating the dark gaps between scanlines is still very much doable, It's just a bit of a different process due to the new physically-based scanline logic. Scanlines (that is, the bright electron beam, not the dark gaps) are now represented with Gaussian distributions that smoothly fade out after a certain width. Dark lines are thinner with more noticeable dark gaps, while bright lines are thicker and bloom into the surrounding gaps. The minimum and maximum size of the beam are controlled with the parameters CRT.lines.min_sigma and CRT.lines.max_sigma. To make the dark gaps disappear, all you need to do is set these parameters high enough to cause the beam to be very wide at all times. The included demo project actually has an example of this (press 7 to cycle through beam widths). In code, it just looks like my_crt.configure_lines({min_sigma:0.5, max_sigma: 0.5}); This should replicate the "no scanlines" look you're going for. I hope this helps!
Thanks,
Sitting Duck Games