There are certain minimums that must be met before processing can proceed.
Single Photo Project
• minimum of one photograph set to "use and adjust" or "use but no adjustment"
• at least four control points or sufficient axes constraints (see Axes Constraints). Note these minimums change if Inverse Camera Processing has been requested. See Minimums with Control Points, Inverse Camera solves for and Working with Unknown Cameras and Photographs
• the photograph's points or constrained lines/edges must cover a reasonable area of the photograph (i.e.. cannot be just on a small region in the photo)
Multiple Photo Project
• minimum of two photographs set to "use and adjust" or "use but no adjustment"
• each processed photograph must have at least six referenced points or four control points. Note these minimums change if Inverse Camera Processing has been requested. PhotoModeler will automatically orient photos that have only 4 or 5 referenced marked points, provided the 4 or 5 marks can have their 3D position calculated based on other photos (i.e. those points appear on two or more other photos that are oriented/orientable, or are control). This makes low-point-count projects and auto-projects with a minimum of coded targets more easily completed. See Minimums with Control Points for additional detail.
• each processed photograph's points must cover a reasonable area of the photograph (i.e.. cannot be marked on just on a small region)
• if there are three or more photographs each processed photograph must have at least one point that appears on two other photographs or at least one control point