AutoCAD Civil 3D Customization

[#1]

I am trying to use an Elevation Target Parameter in the SAC in an equation.

For example using the "Delta X and Delta Y" point geometry type, set from the origin.

Originally I tried:

Delta Y: IF(Invert_Elevation.IsValid, Invert_Elevation.Elevation,0)  In C3D this places the assembly ~2X higher than it should be

I then tried:

Delta Y: IF(Invert_Elevation.IsValid, Baseline.Elevation-Math.ABS(Invert_Elevation.Eleva

tion),0)  This places the assembly closer in C3D, but seems to follow the profile elevation instead of the feature line elevation

If I use other Point Geometry Types that have elevation target overrides I can get the elevations to work correctly in C3D, but I cannot do all of what I want to do by using this method.

Any suggestions?

[#2]

The second expression is closer to what you need. I would use the "From Point" elevation instead of the baseline elevation because you are looking for a Delta Y between the it and the new point.

I would set the point by Slope and Delta X, where the default slope is 0 and use the target parameter to override the slope. (This gets me out of having to do any calculations).

Cheers,

Peter Funk

Autodesk, Inc.

[#3]

I have been working around this problem by using methods similar to what you have suggested, however there are times I would like to be able to use the Target.Elevation within a formula to do more complicated things such as switching which point the elevation target is acting on.

I can get them to work fine in the SAC, but once I put them in C3D they dont behave as I expect.

Do you know what value Target.Elevation returns in C3D?

Thanks,

-Nathan

[#4 · Accepted solution]

I think I have found a work around. 

I create a point whose only purpose is to attach to the elevation target (say P1).  I use a known method (slope and x with target override) to snap it to the elevation target.  I use this point's elevation, P1.y, to replace target.Elevation in my equations.

-Nathan

[#5]

The elevation returned should be the elevation of the point, where 0 is sealevel. This won't work for Delta Y unless you subtract the elevation of the point it is attached to.

in your solution, i would use an AUX point instead of a 'real" point so that it doesn't draw in Civil 3D.

Cheers,

Peter Funk

Autodesk, Inc.