Simulated Annealing to Unfold 3D Meshes and Assign Glue Tabs

Korpitsch, Thorsten; Takahashi, Shigeo; Gröller, Eduard; Wu, Hsiang‐Yun

doi:10.24132/jwscg.2020.28.6

Cited by 8 publications

(12 citation statements)

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“…Sharp edges and strong changes in the normal vectors can be, thus, avoided. This, however, will incur additional computational efforts and time resources, to fold the papercraft [12]. Third, additionally to colored lenses, colored light sources can be employed externally or internally, as seen in Figure 7, to bring forward individual structures.…”

Section: Resultsmentioning

confidence: 99%

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The Anatomical Edutainer

Schindler

Raidou

2020

2020 IEEE Visualization Conference (VIS)

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Figure 1: Examples generated with the Anatomical Edutainer. (a) Printable 2D physicalizations of the human torso and head. In each representation, individual anatomical structures are matched to individual hues, which can be isolated (b) with the use of colored filters. (c) Foldable 3D physicalizations of the human pelvis, torso and head. Similarly to the 2D case, distinct hues are assigned to individual anatomical structures, which can be isolated with the use of colored lights (or colored filters, as in (b)).

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Section: Resultsmentioning

confidence: 99%

“…The 2D physical visualizations offer some degree of interactivity, when explored under the colored lenses. Yet, a higher degree of engagement, understanding and entertainment could be offered with a 3D physical model [12,26]. Also, 3D physical visualizations preserve better the 3D spatial context of anatomy.…”

Section: Methodological Workflowmentioning

confidence: 99%

The Anatomical Edutainer

Schindler

Raidou

2020

2020 IEEE Visualization Conference (VIS)

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“…We also aim to keep the unfolded patches as single connected components, so that the reader gains an overview on the number of individual papercrafts. To achieve this, we adapt our previous approach [KTGW20].…”

Section: Papermesh Unfoldingmentioning

confidence: 99%

“…Mesh unfolding into single connected patch: Unfolding a 3D mesh into a single patch facilitates the reconstruction, as opposed to using multiple patches, but dealing with overlaps and distortions is a difficult task [TWS * 11]. In our previous work [KTGW20], we proposed a method for unfolding a 3D mesh into a single connected 2D patch by searching the best unfolding variant, which is represented by a minimum spanning tree (MST). A simulated annealing optimization is used to find an optimal unfolding.…”

Section: Requirements and Conceptual Choicesmentioning

confidence: 99%

Nested Papercrafts for Anatomical and Biological Edutainment

Schindler

Korpitsch

Raidou

et al. 2022

Computer Graphics Forum

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In this paper, we present a new workflow for the computer‐aided generation of physicalizations, addressing Nested configurations in anatomical and biological structures. Physicalizations are an important component of anatomical and biological education and edutainment. However, existing approaches have mainly revolved around creating data sculptures through digital fabrication. Only a few recent works proposed computer‐aided pipelines for generating sculptures, such as papercrafts, with affordable and readily available materials. Papercraft generation remains a Challenging topic by itself. Yet, anatomical and biological applications pose additional Challenges, such as reconstruction complexity and insufficiency to account for multiple, Nested structures—often present in anatomical and biological structures. Our workflow comprises the following steps: (i) define the Nested configuration of the model and detect its levels, (ii) calculate the viewpoint that provides optimal, unobstructed views on inner levels, (iii) perform cuts on the outer levels to reveal the inner ones based on the viewpoint selection, (iv) estimate the stability of the cut papercraft to ensure a reliable outcome, (v) generate textures at each level, as a smart visibility mechanism that provides additional information on the inner structures, and (vi) unfold each textured mesh guaranteeing reconstruction. Our novel approach exploits the interactivity of Nested papercraft models for edutainment purposes.

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“…However, currently available free tools do not support an easy conversion of textured CityGML and CityJSON objects into textured CAD models. In contrast to general optimization approaches as described in [13,14], the typical geometry of the building models allows a specific greedy procedure for unfolding the models into 2D structures that results in small 2D layout sizes, see Figure 3.…”

Section: Introductionmentioning

confidence: 99%

Automatic Unfolding of CityGML Buildings to Paper Models

Goebbels

Pohle-Fröhlich

2021

Geographies

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3D city models are mainly viewed on computer screens, but many municipalities also use 3D printing to make urban planning tangible. Since 3D color printing is still comparatively expensive and the colors often fade over time, many of these models are monochrome. Here, color textured paper models offer an inexpensive and under-appreciated alternative. In this paper, a greedy algorithm adapted to CityGML building models is presented, which creates print templates for such paper models. These 2D layouts consist of cut edges and fold edges that bound polygons of a building. The polygons can be textured or left blank depending on the existence of CityGML textures. Glue tabs are attached to cut edges. In addition to the haptic 3D visualization, the quality of the 3D models can sometimes be better assessed on the basis of the print templates than from a perspective projection. The unfolding procedure was applied to parts of the freely available CityGML model of Berlin as well as to parts of models of the cities of Dortmund and Krefeld.

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Simulated Annealing to Unfold 3D Meshes and Assign Glue Tabs

Cited by 8 publications

References 0 publications

The Anatomical Edutainer

The Anatomical Edutainer

Nested Papercrafts for Anatomical and Biological Edutainment

Automatic Unfolding of CityGML Buildings to Paper Models

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