We present a concept for interactive rendering of multiple data sets of varying type, including geometry and volumetric data, in one scene with correct transparency. Typical visualization applications involve multiple data fields from various sources. A thorough understanding of such data often requires combined rendering of theses fields. The choice of the visualization concepts, and thus the rendering techniques, depends on the context and type of the individual fields. Efficiently combining different techniques in one scene, however, is not always a straightforward task. We tackle this problem by using an A-buffer based approach to gather color and transparency information from different sources, combine them and generate the final output image. Thereby we put special emphasis on efficiency and low memory consumption to allow a smooth exploration of the data. Therefore, we compare different A-buffer implementations with respect to memory consumption and memory access pattern. Additionally we introduce an early-fragment-discarding heuristic using inter-frame information to speed up the rendering..
[BK11] BARTA P., KOVÁCS B.: Order Independent Transparency with Per-Pixel Linked Lists. The 15th Central European Seminar on Computer Graphics (2011). 2
[BM08] BAVOIL L., MYERS K.: Order independent transparency with dual depth peeling. NVIDIA OpenGL SDK (2008), 1–12. 2
[BPE_15] BUSTAMANTE M., PETERSSON S., ERIKSSON J., ALEHAGEN U., DYVERFELDT P., CARLHÃ?D LL C., EBBERS T.: Atlas-based analysis of 4d flow cmr: Automated vessel segmentation and flow quantification. Journal of Cardiovascular Magnetic Resonance (2015). 5
[BPL_07] BAVOIL L., P.CALLAHAN S., LEFOHNM A., AO L. D. COMBA J., SILVA C. T.: Multi-fragment effects on the gpu using the k-buffer. I3D ’07 Proceedings of the 2007 symposium on Interactive 3D graphics and games. Pages 97-104 (2007). 2
[CCF94] CABRAL B., CAM N., FORAN J.: Accelerated volume rendering and tomographic reconstruction using texture mapping hardware. Proceedings of the 1994 Symposium on Volume Visualization (1994), 91–98. 2
[CL93] CABRAL B., LEEDOM L. C.: Imaging vector fields using line integral convolution. In Proceedings of the 20th annual conference on Computer graphics and interactive techniques - SIGGRAPH ’93 (1993), ACM, ACM Press, pp. 263–270. 2, 3
[Cra10] CRASSIN C.: Opengl 4.0+ abuffer v2.0: Linked lists of fragment pages, 2010. 4, 5
[EHK_06] ENGEL K., HADWIGER M., KNISS J., REZKSALAMA C., WEISKOPF D.: Real-Time Volume Graphics. A K Peters, Ltd., Wellesley, Massachusetts, 2006. 2, 3
[Eve01] EVERITT C.: Interactive order-independent transparency. NVIDIA OpenGL Applications Engineering 2, 6 (2001), 7. 2
[FW08] FALK M., WEISKOPF D.: Output-sensitive 3D line integral convolution. IEEE Transactions on Visualization and Computer Graphics 14, 4 (2008), 820–834. 2, 3
[Int97] INTERRANTE V.: Illustrating surface shape in volume data via principal direction-driven 3d line integral convolution. SIGGRAPH ’97 Proceedings of the 24th annual conference on Computer graphics and interactive techniques. Pages 109-116 (1997). 2
[KM05] KAUFMAN A., MUELLER K.: Overview of volume rendering. Visualization Handbook d (2005), 127–174. 2, 3
[KW03] KRUGER J., WESTERMANN R.: Acceleration techniques for GPU-based volume rendering. Proceedings IEEE Visualization (2003), 287–292. 2
[LFS_14] LINDHOLM S., FALK M., SUNDÉN E., BOCK A., YNNERMAN A., ROPINSKI T.: Hybrid data visualization based on depth complexity histogram analysis. Computer Graphics Forum (2014). 2
[LHD_04] LARAMEE R. S., HAUSER H., DOLEISCH H., VROLIJK B., POST F. H., WEISKOPF D.: The State of the Art in Flow Visualization: Dense and Texture-Based Techniques. Computer Graphics Forum 23, 2 (jun 2004), 203–221. 2
[MCTB12] MAULE M., COMBA J. L. D., TORCHELSEN R., BASTOS R.: Memory-Efficient Order-Independent Transparency with Dynamic Fragment Buffer. 2012 25th SIBGRAPI Conference on Graphics, Patterns and Images (aug 2012), 134–141. 2
[MHDG11] MUIGG P., HADWIGER M., DOLEISCH H., GRÖLLER E.: Interactive volume visualization of general polyhedral grids. IEEE transactions on visualization and computer graphics 17, 12 (dec 2011), 2115–24. 2
[PDB] PDB: Structure of native and apo carbonic anhydrase ii and structure of some of its anion-ligand complexes. 6
[RGW_03] ROETTGER S., GUTHE S., WEISKOPF D., ERTL T., STRASSER W.: Smart Hardware-Accelerated Volume Rendering. Symposium on Visualization (VISSYM ’03) (2003), 231–238. 2
[RSHTE99] REZK-SALAMA C., HASTREITER P., TEITZEL C., ERTL T.: Interactive exploration of volume line integral convolution based on 3D-texture mapping. Proceedings Visualization ’99 (Cat. No.99CB37067) Li, section 6 (1999), 233–528. 2
[SBF15] SCHOLLMEYER A., BABANIN A., FROEHLICH B.: Order-independent transparency for programmable deferred shading pipelines. In Computer Graphics Forum (2015), vol. 34, Wiley Online Library, pp. 67–76. 2
[SEA08] SINTORN E., EISEMANN E., ASSARSSON U.: Sample based visibility for soft shadows using alias-free shadow maps. Computer Graphics Forum 27, 4 (2008), 1285–1292. 2
[SH95] STALLING D., HEGE H.-C.: Fast and resolution independent line integral convolution. Proceedings of the 22nd annual conference on Computer graphics and interactive techniques - SIGGRAPH ’95 (1995), 249–256. 2
[SSK_15] SUNDÉN E., STENETEG P., KOTTRAVEL S., JÖNSSON D., ENGLUND R., FALK M., ROPINSKI T.: Inviwo – An Extensible, Multi-Purpose Visualization Framework. Poster at IEEE Vis, 2015. 5
[SSKE05] STEGMAIER S., STRENGERT M., KLEIN T., ERTL T.: A simple and flexible volume rendering framework for graphicshardware-based raycasting. Fourth International Workshop on Volume Graphics, 2005. (2005), 187–241. 2
[SSKLK13] SHREINER D., SELLERS G., KESSENICH J., LICEA-KANE B.: OpenGL programming guide: The Official guide to learning OpenGL, version 4.3. Addison-Wesley, 2013. 3
[vW03] VAN WIJK J.: Image based flow visualization for curved surfaces. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control (2003), 123–130. 2
[Zha14] ZHANG N.: Memory-hazard-aware k-buffer algorithm for order-independent transparency rendering. IEEE transactions on visualization and computer graphics 20, 2 (feb 2014), 238–48. 2
