When previewing my orthomosaic in the color points mode, or looking at the final orthomosaic there are holes.
Probable Resolution #1:
Holes can occur if one or more sides of the triangles formed from the triangulation of the loaded points exceeds the Max ground triangle setting. Increase the value to allow the triangulation to stretch across the voids. In preview mode this is done on the Color Point Settings dialog when starting Color Points.
For the final orthomosaic, modify the TerraPhoto -> Settings -> Laser Points -> Ground Model Triangles -> Max Length before rectifying the mosaic.
Probable Resolution #2:
Terrain with steep relief, such as mountainous terrain, can cause the edges of the imagery to move inward by great distances thereby creating holes between images due to not enough overlap of the images that cover the area.
Probable Resolution #3:
For final orthomosaics, ensure the Ground Model -> Search Points setting in the Rectify Mosaic dialog is large enough to span voids, such as waterbodies, in a dataset such that ground points on the other side of the void may be found and a TIN formed to cover the hole. No ground model in a location means a hole in your resulting orthomosaic.