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Originally published at AECBytes: Other options include Subtraction with Upwards Extrusion , which allows one element to cut off the top of another such as a roof trimming a wall, or a slab opening up space in the site topography without requiring that the Operator element actually encompass the entire upper volume to be removed.
SEO relations are ongoing and endure as long as both elements are part of the project, which means that cuts or joins can easily be modified as design choices are refined or changed, and instantly update. Combinations of operations can create otherwise complex shapes very simply. A basic example of SEO is removing a groove from a wall. The user will create a cutting element out of any convenient tool such as a slab or object. Note that the elements like beam, wall etc. Make sure that the cutting element has a higher priority than the element to be cut.
The cutting element is termed the Operator , the wall is called the Target , and the operation in this case is Subtract. The walls were selected using the Arrow tool, and the user clicked on the Get Target Elements button, which now indicates 4 Target Elements stored.
The walls were deselected using the Escape key, then the cube objects were selected, and at this moment the Get Operator Elements button is being clicked. The Subtraction operation will be chosen from the popup menu, and the Execute button will then be clicked to complete the SEO operation. At first, there is nothing to see! The elements look unchanged since the cube objects are blocking the view of the grooves in the walls. In order to view the results, the layer for the objects may be hidden.
Voila—now the grooves are plainly visible. You can see that the grooves have a contrasting color because of the optional setting for New Surfaces of Target to Inherit Attributes of Operator.
Do not delete the Operator element in order to see the result of a subtraction, since the SEO is only maintained as long as the Operator is in the project. If you delete the cutting object, the groove goes away. Hide its layer instead! Then the object as well as anything else on that layer will be visible in wireframe in the 3D view, allowing you to see the results of the SEO while still being able to select and edit the object.
The cutting objects can actually be quite complex. Molded profiles can easily be used, and even grids or other complex objects can quickly add detail to the modeling. Elevations and section drawings will show the effects of the SEO operations very cleanly. Another simple example is trimming walls by one or more roofs. In this case, the walls are Target elements, the roofs are Operator elements, and the operation is Subtraction with Upward Extrusion. The result is similar to the Trim to Roof command, but remains dynamic.
Site topography in Archicad can easily be represented using the Mesh tool. In the following example, the mesh is the Target , and several floor slabs act as Operator elements, using Subtraction with Upward Extrusion. If the building elevation or footprint changes, the hole in the site mesh updates, keeping 3D views as well as sections clean and in sync.
Creating a path or road that follows the site topography can be done using a simple combination of SEO steps. First, the path boundary is defined using a basic slab set to go above the prevailing grade. Optionally, line, polylines, arcs, splines, fills or other 2D drafting elements can be used to lay out the path; then its outline can be automatically traced with the Magic Wand tool to create the slab polygon shape.
Since the slab is flat, it protrudes above grade, as shown below. Next, the slab is chosen as the Target element, and the mesh as the Operator element, using Intersect as the SEO operation. You can see that the slab now is embedded in the mesh, since it only shows up in the 3D space that intersects with the mesh.
However, the mesh still shares the same space, so the display of the surface is strange since Archicad tries to show both elements. To clean this up, a second SEO is performed.
This time the mesh is the Target , the path slab is the Operator , and the operation is Subtract. After executing the SEO, here is the elegant result in 3D which will also give a clean section:.
The basic idea is easy to learn, yet their use and applications will expand along with your design imagination. He can be contacted at eric bobrow. Guides Videos Tips Troubleshooting Technotes.
After executing the SEO, here is the elegant result in 3D which will also give a clean section: How to Create a Flat Top Roof. This article describes how to create sloping structures in ArchiCAD, e. The Slab Tool can not have a slope. So here is how you do it: Consider the following flat roof: Its Section looks like this: Sloping "slab"… Read more. Trim function helps you to edit the existing elements quickly and easily in 2D and 3D view.
Elements can be trimmed with Scissors Tool. One can cut off unneeded portions of Walls, Lines, Arcs etc.