Part 2: BlendsIn the traditional Revit environment, you have to decide on a blend before you start. In the massing environment you can do that or decide to create a blend after you have made an extrusion. The exact method depends on how the profile is created before using it to generate a form.
I have recorded a video description of this process, available on YouTube.
This one is pretty quiet, maybe suitable for an open plan office. Crank up the volume if you are at home.
Read on if you don't like videos (or you are hard of hearing!).
There are several ways to create a blend form in the CME:
Method A (Unlock Extrusion)This method assumes that you already have a form created as an extrusion.
- Select the form;
- ‘Unlock Profiles’ (if locked)
- This converts the form into a blend, which has a profile at each end (each the same to start with) – they can be edited separately.
- Each profile can be edited in sketch mode (Edit Profile command).
If the profile was reference lines:
- The start remains as reference lines, with limited edit capability (move the reference lines)
- The end profile can be edited in sketch mode
If the original profile was a component:
- you can edit the end profile only, not the start profile
- If the profile family is parametric, you can adjust the form parametrically
- You can edit the profile family, and the form changes when you reload the family - within reason; if the changes are too drastic, it may fail when you try to reload.
Method B (Create Blend)Create two parallel 2d profiles (model, reference lines or flat components) ;
- Select both profiles;
- ‘Create Form’
- Revit will create a Blend form
If the profiles were model lines:
- You can edit the profiles of each end
If they were reference lines:
- You have limited edit capability (move lines)
If the original profiles were components:
- You can change them (if parametric)
- Or you can edit the profile family and reload
The two starting profiles do not need to be parallel.