Option 1 (recommended)
Use Projected Calculation Points, or Stair Calculation Points to project points onto the desired model surfaces.
Use planar face points, hosted to a sloping surface, such as a parking garage ramp.
- Easy to place and configure, for sloping surfaces that already exist in the model.
- Points must be placed on the entire surface. Restricting placement to only a portion of the surface is not possible.
- If the surface of interest is in a linked model, the linked model must contain at least one "3d view" for successful placement of planar face points. More info available here.
Add line-based points to a model line. "Line offsets" can be added in the Add Points dialog, as a means to create a grid, when desired. It is also possible to use the Add Points command on multiple lines, to create a combined set of calculation points for statistical analysis.
- This approach is highly flexible and allows points to be placed in a wide variety of complex geometric cases.
- Model lines can be associated with other model geometry and be configured to "flex" with changes to the model (e.g. the slope of the ramp is changed)
- Sloped model lines are difficult to place in Revit. Difficult, but not impossible. See this article for a possible technique.
Add line-based points to a detail line.
- Detail lines behave quite similarly to model lines for the purposes of placing ElumTools calculation points and share many of the same advantages.
- Detail lines are easier to place in a section view (with or without a slope) when compared to model lines.
- Detail lines are view specific and will only appear in the view in which they were placed (model lines may appear in multiple views).
- It is not easy to configure detail lines to "flex" with changes made to other geometry in the model. Geometric changes to the model may require the detail line to be recreated accordingly.