BIM Tips

Point Cloud to a BIM Model - Modeling a Church - 3 The Interior

Point Cloud to a BIM Model - Modeling a Church - 3 The Interior

In this series, we cover how to work with point clouds and how to trace and convert a point cloud to a BIM model. In my last 2 posts, I showed you how to create the external parts; the roof and walls, and the tower and windows. In this final installment, I will show you how I created the most intricate part of the church in 3D: the inner arcade with all its complex arches.

Making the inner arcades

To make the inner arcades I used basic 3D modeling: extruding polylines and shelling solids.

How to Do This

  1. Make a new Volume Section use BIMSection with the Detail option, that shows only the inner arcades.Point Cloud to a BIM Model - Picture25
  2. Set your UCS to the back face, of the front wall, of the church.
  3. Use Polyline and Arc to draw the contour of the arches (Mirror the first arc, to get a symmetric result -- These are the same as the steps used to create the window shape).
  4. Use Region to make a region from the polyline.
  5. Extrude the region into a solid. Extrude all the way to the end of the church. You should now have something like this:Point Cloud to a BIM Model - Picture26
  6. Copy the solid twice. Position it next to the original one.
  7. Copy the solid and rotate it 90° to make the shape of the arcade.Point Cloud to a BIM Model - Picture27
  8. Array the last arch all the way to the end of the church.Point Cloud to a BIM Model - Picture28
  9. Explode the array.
  10. ClipDisplay the volume section and isolate the arches.Point Cloud to a BIM Model - Picture29
  11. DmPushPull the sides of the arches to the required width.
  12. DmPushpull the sides of the side arches required length.Point Cloud to a BIM Model - Picture30
  13. Subtract the arches in the length of the church from the ones in the width.Point Cloud to a BIM Model - Picture31
  14. Shell the main arch. Remove the bottom face.Point Cloud to a BIM Model - Picture33
  15. Shell the two solids in the front of the church, with the front and back face removed:Point Cloud to a BIM Model - Picture34
  16. Repeat steps 14-15 for the rest of the solids
    Or use Copy/Paste.Point Cloud to a BIM Model - Picture35
  17. Slice off the bottom part of the arches:Point Cloud to a BIM Model - Picture36
  18. Use XEdges to extract the edges of one of the side arches, draw a polyline from the arch endpoints to then create this region out of them:Point Cloud to a BIM Model - Picture37
  19. Extrude this region.
  20. Copy and paste the solid to all the similar locations.Point Cloud to a BIM Model - Picture38
  21. Subtract those solids from the main arch.
    You should now have something like this:Point Cloud to a BIM Model - roof 2-e1579778566414
  22. After some more clean-up, you should have something like this:Point Cloud to a BIM Model - roof

Placing the columns

To finish off I adjusted the placement of the column to match the arcade.

How to Do This:

  1. DmPushPull the top faces of the columns to extend them to reach the arcade.
  2. Move the columns to match the intersections of our arcade (explode the array first).Point Cloud to a BIM Model - Picture45

The result

You should now have a nicely modeled church (or whatever building you were modeling) based on a point cloud.Point Cloud to a BIM Model - with point cloudIf we crop the site of the church out of the point cloud, we can see the model in its surroundings:

Point Cloud to a BIM Model - Picture53

If we give the model some materials, it starts to feel like a real church!

...and if we do some quick rendering with the Enscape intergration, our result is very satisfactory!

Point Cloud to a BIM Model - Picture56-1Point Cloud to a BIM Model - Picture54Point Cloud to a BIM Model - Picture55

We can conclude from this series that having the point cloud in your drawing greatly simplifies the modeling process. A complex church that would take ages to measure and remodel is now easy to recreate using the point cloud as a guide!


Point Cloud to BIM Model:

  1. The Outside
  2. Windows and Towers
  3. The Interior

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