3D solid to Mass Element to Wall - Cannot use endcap
What Wall Style did you choose when you did the final conversion? If the Wall Style only has a single component, and you try to edit the endcaps in place, the command will exit with a message stating, "Wall does not have valid components for endcaps." You need at least two components in a Wall to be able to apply a Wall Endcap.
Accepted solution
This is not something I do very often; on taking a second look, I can offer the following observations:
1. You can convert directly from a 3D Solid to a Wall; no need to go to a Mass Element intermediary. (You can in ACA 2016, anyway.)
2. When you convert a 3D Solid or Mass Element to a Wall, you will only be offered single-component Wall Styles as choices for the initial style.
3. The 3D Solid or Mass Element is applied to that single component as a Body Modifier, and replaces the component. (For a 3D Solid, ACA will convert it to a Mass Element, which is then applied as a Body Modifier.) This is why making any changes to the length, height or width (if the component is variable width) has no effect on what you see in the drawing.
4. If you then change the Wall Style to a multi-component style, you are not getting a second Wall next to the original, what you are seeing is that the Body Modifier is being applied to one of the components in the new Wall Style and the remaining components are behaving "normally". I am not certain if this is always the case, but in my brief experimentation today, the Body Modifier was applied to the component with the highest index number. Also note that, depending upon where and how you defined the Baseline during the conversion process, the Body Modifier may cause the effected component to overlap the other components.
5. In my limited testing, the component to which the replacement Body Modifier was added when changing the Wall Style to a multi-component style was not affected by the assigned endcap.
Given the above, how you should proceed will depend on the nature of the 3D Solids you are converting, the type of Walls you need, and whether Wall Endcaps. If the 3D Solids are rectangular prisms defining a "normal" Wall, you may be better served by simply redrawing the Walls, tracing along the 3D Solids, rather than converting them. If you are using the 3D Solids to create Walls with sloped vertical faces, or with non-parallel opposite faces, then you may need to live with the limitations.
