Dragging Slanted Column Grips

[PhilvK]

I have a condition where I have 2 slanted columns that are at an angle to each other (1st image), and will not be the same length along the slant, i.e., height. I created the first one and then rotate-copied to get the second one. I noticed that when I tried to change the length of the second by dragging the grip while in the 3D mode (2nd image), the position and rotation of the column changed (3rd image). I also noticed the same behavior while trying the create the same thing with generic in-place components. I am assuming that the “rule” is that you can’t drag the grip and get the correct results unless you are looking at the column’s work plane, is that correct for columns and components?

[chrisplyler · Accepted solution]

The specific set of behaviors you're up against are true for columns and any other family that is controlled by a top level and a bottom level. Such families (let's just say columns from now on) don't have a Length parameter. They have a bottom constraint and a top constraint, and they have a top offset value and a bottom offset value.

When you're at some random angle in a 3D view, and you drag the end of the column, revit assumes you're moving that end of the column around in the X and Y coordinates, because it knows the Z coordinate of that end is set by the top constraint parameter. If it's a straight column instead of a slanted one, revit thinks you're moving the whole thing around in the X and the Y, since it has to remain vertical.

If you want to make the upper end of a slanted column longer, you'll have to raise its top constraint or give it a top offset.

[PhilvK]

Makes sense now that I think about it. Thank you.