Node Editing Roof Slabs

You can Edit Roof Slabs just as you can edit walls and most objects. You can:

• Select a Node and delete it using the local menu.
• Right click on an edge and add a node from the local menu.
• Select and move node/s.
• Select the arrow on an edge to drag it to expand or reduce the slab.

Editing Roof Slabs also has several special features.

Set the Pivot Edge: This specifies the edge which will serve as the pivot when any future adjustments are made to the Slope or Rise-Run properties. The green line indicates the pivot edge.

Set the Edge Cut: This allows you to set each edge of the slab to be Plumb or Square. By default the value is set to Square.

Set the Edge Cut Angle: This allows you to the angle between the top plane of the slab and the edge plane if the Edge Cut is set to Square, or between the ground plane the edge plane of the slab if the Edge Cut is set to Plumb. By default the value is set to 90.

To Set the Pivot Edge

1. Select the Roof Slab with the Edit tool
    
2. Select Pivot Edge Edit from the local menu.
    
3. Hover over the desired edge. It will be highlighted in red.
   
4. Click to set the edge.
   
5.  

To Set the Edge Cut

1. Select the Roof Slab with the Edit tool
   
2. Hold down the Shift key
3. Hover over the desired edge. It will be highlighted in white. 
   
4. Click on the edge.
5. From the Inspector bar select Plumb from the Edge Cut drop-down.
    
6. The result will be a Plumb edge.
    

B. Extending a Slab/Roof Slab

Use this procedure to extend a slab or roof slab to a plane defined by another slab, roof slab, or wall. This target object itself does not have to intersect with the extended slab/roof slab, as long as it projects an intersection in the current user coordinate system (UCS).

1) Select the target flat plane
2) Select the first edge to lengthen
3) Select the second edge to lengthen

Can be created from closed polyline.
Each edge has two properties:
1) edge cut orientation (plumb or square)
2)angle (relative to the orientation)

C. Miter Roof Slabs

Tool has local menu item: "By Intersection". If define option "By Intersection":
Use this procedure to miter two intersecting roof slabs. Both roof slabs are trimmed along the intersection of their perimeter lines. Vertices are added or removed as required. The new edges of the roof slabs are set to angles required for a true miter cut. If the slab thicknesses of the two edges are different, the angles are different

1. Select the first roof slab at the side of that slab to keep. 
The opposite side is trimmed.

2. Select the second roof slab at the side of that slab to keep. 
The opposite side is trimmed.

If does not define option "By Intersection". Mitering Roof Slabs Using Edges
Use this procedure to miter two roof slabs that do not intersect. You can select particular edges to miter. You can miter edges of overlapping roof slabs without trimming the entire slab. To accomplish this, however, you may need to insert additional vertices. Only one edge of each roof slab is mitered.

1. Select one edge on the first roof slab.

2. Select one edge on the second roof slab.

C. Creating a Roof Slab from a closed polyline