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ramp-curve-fit

 

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ramp-curve-fit

 

rcf

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Description

Modify string so that its end tangentially fits another string.

How to use

This command modifies a string by creating a curve from its end segment to a segment of another string. You are first prompted to select the string to be modified, towards the end from which the curve is to start.

You then select a segment on a second string on which the curve is to end. After entering the turning radius, the first string will be modified to curve at the specified radius and tangentially fit onto the identified segment on the second string.

The command is modal, allowing you to select corresponding pairs of string ends and segments, with the curves being inserted at the originally specified radius.

It will be possible to fit a curve if:

  • The first string crosses the identified segment, or ends within the specified radius of it In the following example, the left hand image shows two intersecting strings, and the pick order/position of both strings during the command. A radius of 15 is applied and the resulting string modification is shown on the right:

      The extrapolation of the first string end segment crosses the identified segment on which the curve is to endThe following series of images show two non-overlapping strings. As the theoretical  extrapolation (continuation) of the first string forms an intersection from which to base a ramp curve fitting, the operation acts as if the strings were overlapping:

  • Apart from the end point of the first string there are no other points within the specified radius of the intersection pointTo allow the command to operate, it is important that no other string points (other than the terminal point of the first string) are within the intersection 'zone' (whether theoretical or actual). In the image below the left hand image shows a possible alignment of strings for this command, and the right shows two red points that will cause the calculation of an intersection point to fail, resulting in a corresponding error in theStatuscontrol bar.

      For all possible string alignments, ramp curvefitting will be three-dimensional, in that the end point will exactly fit on the selected segment, and the elevations of the curve points will be such that the newly curved part of the string will have a consistent gradient.