An object may contain points for which Photo4D cannot compute their coordinates. Or perhaps the computation errors are too large. These points can be found by using the validation feature.
First, the thresholds for point estimation error and strength in the Compute page should be set to proper values. The object validation checks all the points against these thresholds. For a point in an object, if its coordinate estimation error is greater then the error threshold, OR its estimation strength is less than its strength threshold, this point will be flagged as a 'weak point'.
To validate all the objects: