You can project objects to multiple section views by specifying projection rules for the objects.
Rather than selecting individual objects to project, all objects of a specified type within a specified area before and after the sample lines are projected.
Linear objects such as feature lines, survey figures, and 3D polylines are projected only when they intersect a sample line for a given section view. The projection rules do not apply to these objects.
Projection Rule: By Percentage Option
The By Percentage option is useful when the sample lines are not evenly distributed along the alignment. For example, in the following illustration, using a percentage of 50 will encompass all the area between sample lines even though they are different distances apart.
Projection Rule: By Distance Option
The By Distance option is useful when the sample lines are distributed uniformly or if you only want to include objects that are an absolute distance away from the sample lines.
The following illustration shows how objects within a specified distance of 25’ before and after the sample lines are projected.
If an object’s insertion point is within the area, then it is projected even if part of the object extends beyond the region, as shown by the object in the lower-left corner of the illustration.
Projection Rules for Non-Perpendicular and Non-Radial Sample Lines
The command assumes the following:
- Sample lines (solid blue lines) are considered to be either perpendicular or radial to the alignment (dotted blue lines).
- The locations of the objects to be projected are considered to be relative to the alignment stations (1 and 2 in the following illustration).
In cases where you have non-perpendicular or non-radial sample lines, an object that appears to be “before” or “after” a sample line can actually be in the opposite position because of the way the object’s station is determined relative to the alignment.
The following illustration shows how this is determined. The station of object 1 is determined to be before the location where the sample line crosses the alignment (4), so the projection rules for “before” are used for it, even though the object itself appears to be after the skewed sample line (3).
The opposite is true for object 2. It is determined to be after the sample line according to its station, so the rules for “after” are applied to it. Since both objects fall into either a “before” or “after” region, they are both projected.
The following illustration shows how the projection results are affected by a smaller “before” region. Because the station of object 1 now falls outside of the region, object 1 is not projected.
