Authors:
Johannes Merz
1
;
Roman Getto
1
;
Arjan Kuijper
2
and
Dieter W. Fellner
2
Affiliations:
1
TU Darmstadt, Germany
;
2
TU Darmstadt and Fraunhofer IGD, Germany
Keyword(s):
Sketch based Modeling, Sketching, 3D Modeling, Parameter Ranges, Parametric Modeling, Procedural Modeling.
Related
Ontology
Subjects/Areas/Topics:
CAGD/CAD/CAM Systems
;
Computer Vision, Visualization and Computer Graphics
;
Geometry and Modeling
;
Interactive Environments
;
Modeling and Algorithms
;
Sketch-Based Interfaces
Abstract:
This paper presents a novel technique to intuitively insert meta-parameters into a procedural model with the
help of sketch-based interaction. The procedural model is represented in a GML (Generative Modeling Language)
representation, which is a script language that focuses on the description of three-dimensional models.
A GML model consists of a sequence of procedural modeling commands, for example extrusions. These are
called with a set of local offset positions, which can be converted to global space and anchored in the surface
mesh by finding reference vertices on the mesh. The system uses a deformation technique to deform the surface
of the model. During the deformation, the reference vertices provide the global offset positions, whose
path can be approximated by a B-spline. Exchanging the initial values of the commands by this B-spline,
defines a continuous parameter space of the meta-parameter. The deformation process is supported by a mesh
segmentation to create pre-defined d
eformation targets. Using sketch-based methods, these can be adapted
to the user’s needs. The results show that the system closely imitates the deformation with the help of the
modeling commands. Furthermore, the system was evaluated to be intuitive and easy to use.
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