rhinoreverse is an integrated plug-in for the Rhinoceros 3D NURBS modeler that helps in creating NURBS surfaces from mesh data.
Start by sketching curves on the mesh and then rhinoreversewill automatically fit NURBS surfaces to the mesh. rhinoreversehas the unique ability to represent large complex shapes with just a few NURBS surfaces by creating surfaces with 2, 3, 4 or more edges.
Furthermore, rhinoreverse enhances Rhino's already powerful NURBS modeling capabilities by adding the ability to control continuity and tolerance between NURBS faces, healing NURBS models by adjusting faces and face boundaries, and filling holes in NURBS models within a given tolerance.
Ease of use Arbitrary faces can be defined, to represent design intentions like feature lines very smoothly. The user only has to sketch a grid, containing boundary curves for all new faces (Figure 1 to 3). For this sketching procedure he only needs the mouse. The use of rhinoreverse™ is very intuitive and easy.
Innovative new algorithms Rhinoreverse™ generates trimmed faces. This procedure enables the user to define arbitrary faces by up to 25 boundary curves. Figure 4 shows such a typical trimmed face, highlighted in yellow, with more than 4 boundary curves. Decouplig the approximation routine from the sketched boundary curves improves the shape quality a lot. The shape of the faces is now only dependent from the shape of the given point mesh. To sketch the curves for the model shown in figure 1 we need today approx. 25 faces.
High face quality If the option "healing" is used, the transitions between calculated faces will be adjusted to Rhino´s current tolerance settings. This ensures, that the resulting face model can be used afterwards for solid operations or NC programming without any rework
Fast skinning method Additional option to rapidly create simplified faces, has been revised and improved. The goal is to represent point meshes quick-and-dirty with a small number of faces. The example in figure 8/9 shows the representation of the head by the use of only 4 NURBS-faces.
Several import interfaces for mesh data (*.stl, *.wrl, *.vrml, *.af, *.nas, *.txt)
Simple sketching of boundary curves on the given mesh data by using the mouse
Flexible definition of the faces by 2 to 25 boundary curves (former: 4 curves define one face)
Optional mode, to skin the point mesh quick-and-dirty with a low number of faces
Flexible use of arbitrary t-joins for local refinements
Use of only one file (*.3dm) for saving all data
Automatic calculation of topology by using graph algorithms
Automatic approximation of start faces
Robustness against small holes and sharp edges in the mesh
Automatic recalculation of face transitions to Rhino´s tolerance settings
Robustness against gaps in the point mesh
Additional "healing"-function, to improve quality of already existing face models: Automatic elimination of small gaps, steps and overlaps
Additional "relief"-function to cover large country surfaces
Additional "patch"-function to fill holes and create surface blends
Additional special features
Powerful "healing" algorithm - RRHeal
Already existing NURBS-face models can be healed: Small gaps, steps and overlaps will be filled automatically. The goal is to improve data quality in order to enable solid-modeling and NC-milling.
Relief surfaces - RRRelief
In geography and architecture large relief surfaces are given in STL format. But for engineering tasks often NURBS face data are needed. To transform them, the method RRRelief was designed. This function works similar to Rhinos "drape" command.
Advantages: The resulting NURBS face shows a homogenous distribution of control points. Also steep surface areas are processed well. The handling of large meshes is simple and fast.
Patch command - RRPatch
In order to create complex patches the function RRPatch was designed. The function works similar to Rhinos "patch" command.
Advantages: The procedure allows to additional include design curves in order to define the inner shape of the patch. A robust interpolation scheme - which is tolerance based - enables to generate a face within Rhinos internal absolute tolerance. This ensures joinable faces and makes RRPatch easy to use: The user does not have to set lots of parameters.
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