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Mar 20, 2024

**Create Sections on the ScopeBox edges**

ScopeBoxes can be very versatile, and converting their edges to sections might also create a unique workflow in your office. Let me show you how to do that. The video will show you how to create Window Secitons, but the same can be applied to other elements.

### Intro

I was asked on how to Create Sections on the edges of a ScopeBox?

Let's think what we need to do to achieve that:

1️⃣ Pick ScopeBoxes

2️⃣ Get ScopeBox Bounding Box

3️⃣ Calculate Lines and Heigth based on .Min and .Max

4️⃣ Calculate ScopeBox Heigth based on Min/Max Z Value

5️⃣ Calculate Points and Vectors

6️⃣ Create Transform

🎯 Create Sections

💡 Let's code step by step and combine The final script in the end which will work like this:

### 1️⃣ Pick ScopeBoxes

First of all we need to select desired ScopeBoxes. There are many ways to do it, I will create **ISelectionFilter **so I can only select **ScopeBoxes.**

Also keep in mind that Selection.PickObjects() return References. So we need to convert the to actual elements.

💡 Also it's good to check if we even selected any **ScopeBoxes **before going further. **forms.alert** is the perfect solution.

### 2️⃣ Get ScopeBox Bounding Box

Once we got ScopeBoxes, we can start iterating through them. The first thing we need to get its BoundingBox.

We can use get_BoundingBox which is based on **BoundingBox Property.**

### 3️⃣ Calculate Lines and Height based on .Min and .Max

Next, we need to calculate Lines and Height based on BB Min and Max points.

ScopeBox Height would be the difference between Min/Max Z Coordinate.

And to create lines, we would just use X,Y coordinates of both points to create lines between corners.

### 4️⃣ Calculate Points and Vectors

Now we have everything we need, let's start iterating through lines and prepare everything we need for creating sections.

First of all we need to get line points Start, End and Middle.

Start and End points will be used for creating a vector, so our sections is rotated correctly. and Point Mid will be used for the origin point.

### 5️⃣ Create Transform

Now let's create Transform for our section. It looks confusing, but after you use it a few times it gets easy. (Check the video for detailed explanation). To create an instance of Transform we need to use its property **Identity**. It's a bit strange, but that's a common way across all 3D Softwares.

Next we will set Origin property by assigning our our Mid Point.

And we need to calculate X, Y, Z vectors so our section is placed correctly.

The X is going to be the vector we calculated earlier. We will need to Normalize it(Normalized indicates that the length of this vector equals one unit vector). And also we need to rotate it so it looks in the right direction by multiplying by -1.

Y Vector is going to be vertical Axis (XYZ.BasisZ)

Last vector can always be calculated with CrossProduct. The cross product is defined as the vector which is perpendicular to both vectors.

### 🎯 Create Section

Lastly, We need create a SectionBox which will represent the Section itself.

We start by defining a default BoundingBox.

Then we can calculate it's Min and Max points by using **line_length **and **BB_height **values. And we will also apply ther Transform that we've just created in the previous step. This will ensure our section is located in a correct place in 3D space.

### Final Code:

Finally here is how it works:

Let's combine all the code together, so there are no confusing of what goes where.

### ⌨️ Happy Coding!

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