Auto Pivot & Scale Calculation

After adding Buildable Grid Object or Buildable Free Object component to your prefab, simply click on Calculate Size & Pivot button to do the calculation automatically. You can see the same process in the video down below.

For the objects that were originally prepared for the Grid Axis XY (Ex: 2D prefabs) set Rotate Scale & Pivot For XY property enable, then hit Calculate Size & Pivot button. You can see the same process in the video down below.

NOTE: If you are having any issues with objects appearing below the grid level (especially 2D objects) simply manually offset the Object Custom Pivot values to fix your issues.