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Preserve Z values at line intersections instead of zeroing them #1064

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Preserve Z values at line intersections instead of zeroing them #1064

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20 changes: 18 additions & 2 deletions CPP/Clipper2Lib/include/clipper2/clipper.core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -942,7 +942,23 @@ namespace Clipper2Lib
ip.y = originy + static_cast<T>(hity);
}
#ifdef USINGZ
ip.z = 0;
// Interpolate Z from ln1 endpoints based on proximity along segment
{
double seg_dx = static_cast<double>(ln1b.x - ln1a.x);
double seg_dy = static_cast<double>(ln1b.y - ln1a.y);
double seg_len_sq = seg_dx * seg_dx + seg_dy * seg_dy;
if (seg_len_sq > 0.0)
{
double pt_dx = static_cast<double>(ip.x - ln1a.x);
double pt_dy = static_cast<double>(ip.y - ln1a.y);
double t_z = (pt_dx * seg_dx + pt_dy * seg_dy) / seg_len_sq;
ip.z = (t_z <= 0.5) ? ln1a.z : ln1b.z;
}
else
{
ip.z = ln1a.z;
}
}
#endif
return true;
}
Expand All @@ -967,7 +983,7 @@ namespace Clipper2Lib
ip.x = static_cast<T>(ln1a.x + t * dx1);
ip.y = static_cast<T>(ln1a.y + t * dy1);
#ifdef USINGZ
ip.z = 0;
ip.z = (t <= 0.5) ? ln1a.z : ln1b.z;
#endif
}
return true;
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