SurfHarmMod reads model files readable by 3DModel, and fits the surfaces of the objects in the model with surface harmonic expansions. This can smooth the surfaces and eliminate irregularities introduced in the modeling process.
To use, select the input model file. After that is selected, you can use the Choose objects to fit button to limit the fitting process to a subset of the objects in the model.
Then select the output format. Depending on which format is chosen, there are additional parameters that can be specified. At minimum, you'll provide the name of an output file; for descriptions of the other parameters see the descriptions of the output formats.
Finally adjust the order of the expansion (the number of shapes used to fit the surface) and press the doit button.
Overview | Choosing Objects | Output Formats | Order
3DModel | Volume Builder | Priism
There are two different types of output models that can be generated. The first is directly readable by 3DModel and can be in one of two forms: Wire/Solid is a mesh of triangles that covers the surface and Dots is a selection of points that fall on the surface. The only parameter specifically for this form of output is the name of the model file to generate.
The second form of output model consists of slices through the objects in the model with the resulting sections represented as a polygons. This format uses pixel coordinates to specify the polygons so you'll need to enter the file or image window whose coordinate system will be used to do the conversion. The results will be stored in the file you specify as the Polygon File and can be used wherever Priism needs polygon input. If you specify a file name for the Object List, the association between polygons to form the objects in the model is recorded in that file. It is readable by VolumeBuilder using load object list with the old vol. build format. Because it is easy to find the polygons that intersect the boundaries of the data set, the option to exclude objects which intersect the edges from the output is also provided.
Overview | Choosing Objects | Output Formats | Order
The fitting is done by adjusting the coefficients in the weighted sum of a sequence of functions (the surface harmonics). Increasing the order introduces more terms into the sequence allowing greater deviations from a spherical shape (what you get with a zero order expansion) and less smoothing of the input objects. To exclude potential bad points in the input models, the fitting is done in two stages. The first stage uses Order1 for the order of the series expansion; then points which are more than 1.0 units (in terms of the units in the image header) from the fit are excluded and the second stage of fitting is done with Order2 for the order of the series expansion.
Overview | Choosing Objects | Output Formats | Order