A real ceiling is the ceiling calculated when the ambient pressure is at the ceiling. As such, the Boyle's law compensation should be done against the ambient pressure at the ceiling. Instead of doing an iterative calculation, take the lesser ambient pressure of the ceiling of the previous sample, and the depth of the current sample.
This approach gets rid of "blips" in the calculated ceiling due to a step in Boyle's law compensation during ascent. In limited testing, it also appears to avoid creating a ceiling deeper than the calculated plan in most cases. Signed-off-by: Rick Walsh <[email protected]> --- profile.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/profile.c b/profile.c index 79effeb..79308e7 100644 --- a/profile.c +++ b/profile.c @@ -853,13 +853,13 @@ void calculate_deco_information(struct dive *dive, struct divecomputer *dc, stru time_stepsize = t1 - t0; for (j = t0 + time_stepsize; j <= t1; j += time_stepsize) { int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0); - boyles_law(depth_to_mbar(entry->depth, &displayed_dive) / 1000.0); double min_pressure = add_segment(depth_to_mbar(depth, dive) / 1000.0, &dive->cylinder[entry->cylinderindex].gasmix, time_stepsize, entry->o2pressure.mbar, dive, entry->sac); tissue_tolerance = min_pressure; if ((t1 - j < time_stepsize) && (j < t1)) time_stepsize = t1 - j; } + boyles_law(depth_to_mbar((entry - 1)->ceiling, &displayed_dive) / 1000.0); if (t0 == t1) entry->ceiling = (entry - 1)->ceiling; else -- 2.4.3 _______________________________________________ subsurface mailing list [email protected] http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
