topic Corridor targeting skewed lines in Civil 3D Forum

Corridor targeting skewed lines

RobertEVs — Wed, 04 Feb 2026 20:22:29 GMT

I realize I can't target any line the corridor model does not see first. Even If I set it to Target to Farthest Offset, I would still have this wedge. With my model like this setting my daylight to EG will be incorrect in this wedge area.

Other than featureline this odd-shaped Greenhouse floor and pasting it to the FG as its own surface can this actually be done entirely within the same corridor?

Re: Corridor targeting skewed lines

igi_pop — Thu, 05 Feb 2026 07:04:59 GMT

Hey!

In this case, looking at the screen, target the farthest won't help, as it would only extend trough areas you don't need.

You could draw a feature line exactly where the wedge starts and across the greenhouse (your first link within the greenhouse), add it as baseline, and then target the other two sides of the wedge.

Or even, use the south wall of the house, and target the other three sides. And the main corridor should stay OUT of the house target-wise in that case.

Odd shapes, ey? Bummer.

Cheers,

Iggy

Re: Corridor targeting skewed lines

RobertEVs — Thu, 05 Feb 2026 14:27:12 GMT

Thanks Iggy. Kind of what I thought. I did wind up targeting the front edge only and featureline the entire floorplan then using grading to get my daylight on 4 sides. I know grading is not ideal, but when I have sharp corners like this it is the only thing that grades contours correctly. A corridor daylight never contours out to EG correctly with sharp corners.

Checking to see how someone else might handle this with corridor modeling.

Re: Corridor targeting skewed lines

igi_pop — Thu, 05 Feb 2026 14:26:38 GMT

In the end, it's (almost) never perfect, so we end up finding what works closest to best, and deal with the worm in the brain it leaves behind 🙂