Page 62 - 3DF Zephyr

especially useful for aerial datasets in topography. Tools - Mesh Filters From this menu it's possible to applied the selected mesh filter to a mesh in the workspace. Decimation: select the desired mesh with the dropdown menu and the number of desired vertices. The mesh will be regenerated decimating the vertex count to the maximum specified value once. Densification: select the desired mesh with the dropdown menu and the number of desired vertices. The mesh will be regenerated using the vertex count to the maximum specified value once. Laplacian smoother: will smooth the surface of the selected mesh. Reduces noise and won't keep sharp edges. Bilateral smoother: will smooth the surface of the selected mesh. Reduces noise while trying to keep sharp edges where possible. Fill holes: will fill the mesh holes. From the selection window it is possible to select a specific hole (in the workspace scene the hole border will be highlighted with a border) or all holes of a certain size (or all holes). The color of the triangles that will close the hole will most likely wrong when the missing visibility of the point from the camera will behave in a degenerate way (and, obviously, it is impossible to identify the color of something that is not seen by any picture). Two algorithms are available, watertight and selective. While the selective one can close the selected hole in a fast way, it might not work for complex cases, in which case we suggest to you the watertight algorithm. Photoconsistency Mesh Optimization: the photoconsistency based mesh optimization will adjust the triangle positions to maximize the photoconsistency of their reprojection. You may run this filter directly when reconstructing a mesh (in some presets this feature is disabled, but you may always enabled it from the advanced or custom settings) or after a mesh has been reconstructed from this menu. When you have a good geometry in the mesh to begin with, it's recommended to keep a high resolution in the photoconsistency mesh optimization (50% - 75%) if the initial mesh quality is fine while if you have a low quality mesh as input, you should keep a lower resolution (25%). The other parameters require some clarifications:  Max. vertices (5.000.000): maximum vertex count of the final resulting mesh  Target reprojection area (20): controls the size that every triangle will try to obtain at the end of the photoconsistency process. Given a triangle, its final reprojection area (in pixels) to the nearest camera will tend to get near to the specified value. Lowering this value will make a denser mesh: the final mesh will then have a variable level of detail, with a higher vertex point cloud corresponding to those areas that are viewed by nearer cameras. In most cases the default value will work well; in case you are dealing with a mesh that is already very good (for example, one that has already finished a photoconsistency step) this parameter can be decreased to try and extract even more details, while it can be increased in case of noisy meshes and low quality images.  Number of neighbor cameras (4): for each camera, a number N of neighboring