Using the draw line tool in 3Dsurvey
Welcome to 3Dsurvey tutorials.
In this guide, we’ll show you how to use the Draw Lines Tool found under CAD functions. This tool is essential for categorizing elements such as roads, construction sites, and buildings using lines, making it easier to classify them. Additionally, it’s useful for measuring areas, which can later be overlaid onto an orthophoto if desired.
Watch the tutorial
Accessing the Draw Line Tool
To begin:
- Click CAD in the upper-right selection menu.
- Select the Draw Lines Tool icon, located fifth in the right-hand menu.
Configuring Snapper Settings
Before drawing, configure your snapping options to ensure accurate placement of line endpoints. Common snapping options include:
- Point: Snaps to any point in the point cloud (ensure your point cloud is turned on).
- Endpoint: Snaps to any endpoint of an existing line.
- Triangle: Snaps to any point on the 3D mesh (ensure your 3D mesh is active).
For a detailed explanation of snapping options, check the Snapper Settings Tutorial (linked in the description).
Adjusting Tool Settings
In the Tool Settings below the snapper options, you can configure additional features:
- Measurements Display: Choose which measurements (e.g., 2D distance, 3D distance) will appear on your line while drawing.
- Point on Vertex: Add points at line vertices.
More details on these options can be found in specific tutorials linked in the description.
Drawing Lines
To draw lines:
- Select a point on the 3D mesh and place the first endpoint using the left mouse button.
- Continue placing endpoints by clicking, forming your desired lines.
- To correct a mistake, press Backspace to delete the last line drawn.
- Once satisfied, press Escape or the right mouse button to confirm.
Editing and Deleting Lines
If you need to modify or delete lines:
- Use the Edit Tool or Selection Tool to select the line.
- Press Delete on your keyboard to remove it.
- To delete a specific segment within a group of lines, remove its endpoint using the Edit Tool.
Handling Point Cloud Noise with Interpolation
For point clouds with minimal noise (e.g., 5 cm), snapping might inadvertently target incorrect points. Use the Interpolate Option to calculate the average height of points within a blue circle, ensuring snapping occurs at the cross’s center on the averaged height.
This concludes the tutorial on the Draw Line Tool. It’s a powerful feature for creating precise classifications and measurements. Thank you, and see you next time!