| 28 | | A mesh can be rigid aligned to another mesh with the same mesh topology (i.e. number of vertices etc) using "Edit->Rigid body normalise", to a 3D template using Edit -> Rigid Body Normalise (T3D) or to a standard reference frame based on 3 points using oe of the Edit -> Orientate 3 points options. The first two will prompt for the mesh or template respectively. For the 3 point orientation the first 3 points of a 3D template will be used. The "Orient 3 point" option uses the first point as the origin (0,0,0) the direction between the second and third points is constrained to lie in the |
| | 28 | A mesh can be rigid aligned to another mesh with the same mesh topology (i.e. number of vertices etc) using "Edit->Rigid body normalise", to a 3D template using Edit -> Rigid Body Normalise (T3D) or to a standard reference frame based on 3 points using oe of the Edit -> Orientate 3 points options. The first two will prompt for the mesh or template respectively. For the 3 point orientation the first 3 points of a 3D template will be used. |
| | 29 | |
| | 30 | The "Orient 3 point" option uses the first point as the origin (0,0,0) the direction between the second and third points is constrained to lie in the x-z plane parallel to the x-axis. Typically point 0 is placed on the bridge of the nose between the eyes, points 1 and 2 are placed on the outer eye corners (outer lateral canthus). |
| | 31 | |
| | 32 | The "Orient 3 point (Alternative)" option uses the midpoint of the first two points as the origin (0,0,0) the direction between the first and second points is constrained to lie in along the x-axis and the third point is constrained to lie in the x-z plane. Typically point 0 and 1 are placed in the ear holes (or some landmark nearby) and the third point is placed on the lowest point on the (left) eye orbit to establish the alignment to the Frankfort plane. |
| | 33 | |
| | 34 | == Warping options == |
| | 35 | |
| | 36 | Warp3D and Batch Warp3D warp using a combination of a 3D template file and alignment of automatically matched points along the surface normal directions. This is done in three stages , first the geometry of the standard surface is warped using the 3D template points, then the normals of the "standard" surface are traced and any intersections with the target surface (within a certain distance) are recorded, these matches are then used to drive a second warp of the surface. During the second warp the texture of the study surface is also warped in 2D into the 2D shape of the "standard" texture map. |
| | 37 | |
| | 38 | The Warp3D (Template) and Warp3D TPS (Template) only perform the first part of this process (warping based on the 3D template points), one with a multi-level B-spline warping method and the other using thin-plate splines. |
| | 39 | |
| | 40 | The Warp Reference option is for warping using a standard texture map that was needed in some recent work. |
