Flatten command

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Flatten command

Postby surveyor6925 » Wed Apr 25, 2012 10:21 am

When using the drape and flatten command I pick on the end of the line that I want to be Station 0+00. The profile and grid is then plotted backwards. My fix is to copy mirror image, reverse the stationing, move the profile to the zero end. Is this a bug or did I miss something?
Tim Riley
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Re: Flatten command

Postby DKNTEC » Wed Apr 25, 2012 1:41 pm

Flatten draws the profile in the direction the line was drawn.
Try it on a line drawn on a 90 degree bearing, and then on a line drawn on a 270 degree bearing, and you'll see what I mean.

To reverse the direction of a line you have already drawn, use MsModeling>Utilities>Polyline Utilities>Swap ends.
This also changes the line to Layer 0, so you will need to change it back to your named layer.

Unlike Bearing/Distance labelling, it doesn't matter which end of the line you pick.

Dan
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Re: Flatten command

Postby DKNTEC » Thu Apr 26, 2012 2:41 pm

Adding a bit more to my post yesterday.
To 'fix' the profile 'going in the wrong direction;

When you drape the original line, MSCAD asks 'Delete the original (2D) line?'
I say 'No', and I keep it on a working layer in case I need it again for the very reason of the problem you've encountered.

Then, if later finding the 'goof' of the profile going in the wrong direction as you did, I;
-delete the reversed drape line (or move it out to a frozen working layer),
-select the original line again,
-do the 'Swap ends' on it as noted in above post,
-Drape it again and then redo Flatten for the new profile in the right direction.

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Theoretically,to reduce the above steps, you might be able to simply do a 'Swap ends' on the already Draped line which is going in the wrong direction, and simply run Flatten again on that same Draped line.
However, I prefer to 'start from scratch' again on the original line, to reduce potential problems, as I once encountered an odd shift while Swapping ends on a Draped complex 'line' - which is why I point this out.

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If your 'line' is complex, more than a simple straight tangent line, i.e. a road CL comprised of straight tangents and curved sections joined into a polyline, try to get all the pieces 'going in the right direction' before joining together into the polyline.
Although I believe MSCAD will 'take the line direction' from the first segment selected when joining pieces into a polyline, I do this to reduce potential for problems.

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If your original line is a simple straight tangent, another way to change the direction is simply snap to the midpoint of the line and rotate it 180 degrees before doing Drape and Flatten.
I prefer the 'Swap ends' method myself though, to avoid an inadvertent location shift.

Let us know here in the forum if this 'Swap ends' worked for you.
Dan
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