A client approached us about helping them to determine whether or not their gym floor was uneven, and to what extent; they have noticed slight depressions in the floor and ‘spongy’ footing in certain areas.
As you might guess, a gym floor should be consistently smooth with very little grade change to it so that athletes can enjoy a generally flat playing surface; the game is tough enough without unsure footing.
An acceptable tolerance of slope on the gym floor is 1/8 inch vertical change over ten feet. To determine if the floor was built to this standard, we performed a 3D laser scan of the floor and then imported the point cloud into Autodesk Civil 3D to build a TIN surface. We then colorized the surface to represent slope ranges: yellow representing value ranges that are built to specification, orange as just slightly outside specification, and red areas as absolutely out of tolerance.
Within Civil 3D, we were also able to further demonstrate the undulation in the gym floor topography by comparing the section view of the floor to a flat plane.
Finally, we displayed contours at an interval of 1/8 inch to help illustrate the problem areas as they relate to the color-gradient slopes and to display general fluctuation in the topography. With the contours, it was easy to corroborate the colorized slope areas; any two 1/8 inch contours within less than 10 feet of each other indicate a grade out of tolerance.
In the end, we confirmed that the client did in fact have a gym floor that is mostly out of tolerance (the red areas in the image) and we were able to precisely map the problem areas.