With computed tomography, the complete work piece geometry is captured with one single measurement. To determine the measurement points in the entire voxel volume, at Werth the material transitions are calculated using a patented subvoxeling process. Using this process, it is sometimes difficult to differentiate between the individual materials in multi-material work pieces. The grayscale values of the background can also differ due to CT artifacts. For this reason, precise measurement points of such material transitions have at times been calculated with only limited success up until now. The new Volume Patch selection provides for very exact multi-material measurements and measurements of high density work pieces. The process provides a higher lateral resolution compared to the previous one, especially for the measurements of fine structures on the edge of the work piece. A further advantage is the larger artifact tolerance. With the CAD model and the voxel volume as source elements, measuring points are calculated for local points of interest. Using the new volume rendering that is now integrated into the WinWerth 3D module, the operation can be perfectly visualized using the voxel volume. This leads to improved measurement results, so that work pieces with even tighter tolerances can be measured. For some work pieces, this is the first time that area based point calculation is even possible. With multi-material work pieces, such as metal plastic components, it is now possible to analyze 3D standard geometries of the material transition between plastic and air, without having to calculate the artifact-rich measurement cloud of the low contrast plastic separately. For fuel injector components with tightly tolerance geometrical characteristics in the nozzle hole, the new process increases the lateral resolution and makes accurate measuring of the outermost edge of the work piece possible.