How to define a user-specific coordinate system (UCS) of a point cloud with Scasa PinPoint. In many cases, you want to align your laser scanning project with axes parallel to it, so that you can work with axes in parallel in the CAD environment. PinPoint offers a lot of interesting options here.
For example, the leveling can be averaged over several horizontal reference surfaces or if there are no horizontal surfaces, facade surfaces can help with alignment. The definition of constructive zero points, because e.g. not accessible on site, is also possible with PinPoint.
But let's go step by step.
1. Activate the Set Coordinate System function in the Edit menu
Activate the Set Coord-System function in the Edit menu.
2. Define the origin of your coordinate system
The easiest way to define the zero point is via three surfaces. Please pay attention to the information in the status bar. Here you will always find instructions for the next steps.
In this example we use the south and east façades of the building as well as the upper edge of the floor in the interior. So click on the 3 levels with a left mouse click.
Please also note our tutorials Add Surface and Control and Navigation.
2.1 Click East Facade - As soon as you left click with the mouse, you will see the symbol for a fixed level.
2.2 Click on the south facade - Next, left-click on the south facade. PinPoint immediately calculates the cutting edge from both planes and shows the captured cutting edge as a symbol on the right.
2.3 Click on the upper edge of the floor - Navigate to the interior and make a left mouse click on the upper edge of the floor. PinPoint instantly creates the new zero point.
3. Define the orientation of the coordinate axes
To define the new coordinate system, you now have to define the orientation of the Z axis and the X or Y axis. Please pay attention to the information in the status line again.
3.1 Define the orientation of the Z-axis
The orientation of the Z-axis can be created using several variants. We would like to introduce both of them briefly.
Leveling over the floor or ceiling. Basically you can click on one or more horizontal areas here.
Example definition of the Z-axis over a floor area
Left click on the indoor floor. PinPoint also shows you that you have selected a plane. After the selection, zoom out of the scene to check the orientation of the Z-axis. To do this, move the mouse over the Define as z-axis button. If the z-axis is pointing in the right direction, left-click the Define z-axis button. You can also reverse the orientation with the Z-Invert key.
Optional: You can select several horizontal surfaces to define the horizon. PinPoint then forms an averaging Z-orientation from all selected areas.
Alternative: If there are no horizontal surfaces in the object, you can also use two or more vertically intersecting planes for the definition. Just try the east and south façades in this example. You can now also see two selected areas in the status bar of PinPoint.
Example definition of the Z-axis over two facade surfaces
Confirm the Z-axis here as well by left-clicking the Define z-axis button.
4. Define the orientation of the X or Y axis
As soon as you have defined the Z axis, PinPoint prompts you to click on a plane for the X or Y axis.
So, for example, left-click on the east facade. Again, you could catch several areas and PinPoint would average out the orientation.
Finally, decide whether it should be the X or Y axis.
After clicking your new coordinate system should be set.
You can of course reset the coordinate system at any time. To do this, restart the process by calling Edit-> Set Coord System and then clicking the 0,0,0 button.