Creating Roof Family for Folding Roof Planes

Not exactly. This is not a new family category in Revit where you can create a component family for the roof. However, one can actually create a mass family and use "Roof by Face" to achieve though.

I have a project where the design team came up with the roof design where two roof planes fold upward. Normally, I can use "roof by footprint" to create the roof. It is possible to do it but it can be tedious sometimes especially for those two end piece of the roof that folds upward. Since we are still studying the shape and want to explore with different roof pitch to get the best form. Trying to model the roof planes work together could be a time sink.

The team wanted to know if there is another way to do this more efficiently; so I thought I could make a mass family of the roof shape, set up a couple of parameters and we are in business!

Start making a mass family, I first lay out some reference points where I need to connect with model lines later. Once the points are set, create dimensions and set up parameters associated with those points.

Next, I use spline through points to create linear model lines (I later convert them into reference lines in the properties)  and get all the points connected.

I then select the reference lines and click "Create Form"; the forms are just surfaces that I need to use it to generate the roof once the mass family is loaded into the project.

Flex the family a few times to make sure the form follows with the parameters. One last thing I did before I loaded to the project was to add the formula to tie the "Height" parameter with the parameter "Roof Pitch". All that is done, it is good to go.

Load it to the project, offset it above the walls; I can use create "Roof by Face" to make these folding planes as a roof.

Since I made the mass family parametric, both the width and length are instance parameters, I can freely adjust the overall size of the roof form by pulling the shape handle. The nice thing about using mass family is that once the shape of the mass is changed, I can use "Update to Face" option to get the roof shape follows the new form as if I have a parametric roof family.

 

I can use the same mass family to generate the roof for multiple buildings in this project.

Reality Power Captured with ReCap Photo

ReCap Photo is the new and improved online image based modeling tool from Autodesk. It used to be called Photofly and later transitioned it to 123D Catch (still in service) as part of 123D family. I have played with it on and off for the last two years.
The concept is simple, you use your digital camera and take a series of pictures around an object or a building, upload it to the ReCap Photo site, then the images will be stitched together via the cloud computing service; as a result, the images are converted it to a 3D object for you.

ReCap Photo home page

I was yet again playing with this technology last week. Since my office is in downtown, I am surrounded by many historical buildings in the area. So I thought to try it with some classical ornament to see what result I get this time.

I found a flagpole with an interesting wrought iron ornament base near my office.

Using nothing but my Samsung S3 phone camera and took a series of pictures; uploaded it to the ReCap Photo site, and waited (depending on the scale and complexity of the object) for about 20-30 minutes. It turned the images into a 3D model and it was ready to view it online.

Series of snapshots with my phone camera

Prior to this experiment, I did go through some trial and errors in the past and learned a better way to take the pictures that the program recommended. The result? Very impressive!




3D view of the flag pole base with high level of detail on the surface

3D mesh of flag pole base

View from the bottom of the 3D model

In order to use this "model" (the online viewer mode is nothing but a composite images stitched together) for further study, ReCap Photo made the conversion from the online format to multiple different (obj., ecm., fbx., ipm and rcs.) formats that can be downloaded via Autodesk 360. There is one file format that I am particularly interested, which is (rcs.) format. (rcs) is a type of indexed point cloud file format that is compatible with ReCap Pro. If you are familiar with ReCap Pro, which came out as a trial version few weeks ago. You can now import your rcs. file in there, clean it up and import it to Revit for reference.

rcs. file (very large file) can be downloaded via Autodesk 360

rcs. file after clean up in ReCap Pro

Inset point cloud file as rcs. format



Point cloud file of the flag pole base in Revit



Once I imported the point cloud to Revit, it seemed like there was a scaling issue with the file. I remembered there was a way to scale properly when it was in 123D catch. I hadn't found it in ReCap Pro yet, perhaps I was missing something. However, I did find a way to scale this point cloud file directly in Revit. Under the type properties of the imported point cloud object, there is a scale parameter you can change it to the appropriate scale.

Scale Factor under type properties (Another way to scale something natively in Revit!?)

I think this could be an awesome addition tool for the Revit users. I could see using this tool as an alternative and yet affordable way to capture the existing building/structure; and one could incorporate this data back to Revit for design as well as documentation. However, I don't think they can be imported into Revit family environment yet. (I wish it can). I have come across and read some online resource about a workaround using AutoCad as a media to bring the point cloud file into Revit family though.

My next step is to try to use this tool for more studies on other Architectural elements. So stay tuned for the future post!