Page 319 - 00. Complete Version - Progress Report IPEN 2014-2016

Materials and Nanotechnology | Progress Report 319

Figure 43: GC screenshots, showing: (left) perspective view of a cubic grain sample in first person naviga-
tion; (center) real-time interactive sectioning; (right) boundary enhancement rendering.

tal structures by combining a lattice with a desktop, mobile and tablet devices and video
motif using solely translational symmetry. Al- demos and its source code is available at the
though very restrictive from the crystallograph- project website at http://gvcm.co/CrystalWalk.
ic point of view, CW makes it simple for stu-
dents to experiment, reproduce and visualize, Leveraging CW’s technological premises, GC is
in an interactive manner, most of the crys- a web-based 3D interactive visualization soft-
tal structures that are commonly introduced ware sought to improve spatial understanding
in materials science and engineering curric- of grain structures. Based on solid cognitive
ula, like fluorite structure shown in figure 41. and learning research, GC introduces novel
CW is open-source and accessible, integrating domain-specific tools that support capturing
state-of-the-art technologies for interactive fundamental characteristics, such as grain size
web applications, such as HTML5/WebGL, ser- and shape, number of neighbors, local hetero-
vice oriented architecture (SOA) and respon- geneities, extreme values and distribution pat-
sive, resilient and elastic distributed systems terns. GC allows seamless exploration of virtual
and support to advanced interaction and vir- grain samples through first-person fly naviga-
tual reality interfaces as Oculus Rift, Google tion (Figure 43) on a grain-by-grain basis, eval-
Cardboard, LEAP Motion, multi-touch devices uating individual sizes and shapes, but also al-
and 3D printing technologies (Figure 42). CW lowing capturing structural information such
can be accessed online at http://cw.gl from as neighborhoods and heterogeneities. Inter-
active real-time sectioning allows infinite sec-
tions to be visualized continuously in a brief
period and designed rendering techniques im-
prove depth perception either on 2D scenari-
os (Figure 44) or in full-fledged stereoscopic vi-
sualization, presenting superior visualization
value compared to earlier attempts. GC can be
accessed online at http://gvcm.co/GrainCrawl-
er/ from desktop, mobile and tablet devices

Figure 44: GrainCrawler screenshots demonstrating a real-time ren- and video demos and its source code is avail-
dering technique that enhances depth perception on 2D visual- able at the project website at http://gvcm.co/
ization. (Left) section plane of a virtual 3D polycrystalline materi-
al. (Right) grains intercepted by the section plane were removed. en-graincrawler/.