# Roof Design - Triangle

The 'Triangle' function allows a portion of a roof-skin line to be modified. If the start and end points of the section are chosen as the start and end points of the line, of course the entire line can be modified. In both cases, a new point is created in the middle of the selected section and the partial line becomes two lines. The new point can be moved, resulting in a triangular contour in the averaging polygon.

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The selected partial line becomes two lines, both of which receive a new line type. The new point can then be moved perpendicular to the line. The shift in the X direction here is 0.000.

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The shift in the X direction in this example is not 0.000. A negative shift in the X direction was entered, which is exactly as large as half of the selected partial line.

For this function, first select the line to be modified. Then select 2 points that determine the area to be moved. You may use all familiar snap and input functions for this. The points do not have to lie on the line and can be chosen anywhere. The chosen point is then projected onto the selected line. For the second point, it is also convenient to use the arrow key when the line is displayed exactly horizontally or vertically on the screen. Then you can simply enter a distance from the first point.

If you actually want to modify the entire line, select the start and end point of the line.

Next, you can move the new point graphically and place it at the desired location. All snap and input functions are available again. When moving, the point can only be shifted perpendicular to the selected line. If the point should also be shifted in the X direction, a shift can be entered later.

After placing the new point, a dialog box opens in which you can correct the point's position once more. When any number is changed, the other numbers will, if applicable, adjust automatically. There is no adjustment to tiles here, as that would not seem sensible. This function always produces oblique surfaces, so tiles must be cut anyway.

**Shift within the roof surface:** This value shows the distance of the new point to the old line, measured in the slope of the surface.

**Displacement in base Y:** This shows the shift in plan from the position of the old line to the position of the new point.

**Elevation of the point:** This field displays the absolute height of the new point, measured from global 0.

**Vertical displacement:** This value indicates the height difference between the old line and the position of the new point.

**Displacement in X direction:** Here the displaced point can be shifted along the longitudinal direction of the old line (parallel). At a value of 0.000, the point remains exactly as it was after the graphical move, resulting in an even triangle. The red arrows indicate the positive slide direction. With negative values you can also shift in the opposite direction.
