caa a22 4500 605540373 CHVBK 20210128100911.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00371-014-1037-z doi (NATIONALLICENCE)springer-10.1007/s00371-014-1037-z Spectral caustic rendering of a homogeneous caustic object based on wavelength clustering and eye sensitivity [Elektronische Daten] [Budianto Tandianus, Henry Johan, Hock Seah, Feng Lin] In the real world, the index of refraction of a refractive object (caustic object) varies across the wavelengths. Therefore, in physically based caustic rendering, we need to take into account spectral information. However, this may lead to prohibitive running time. In response, we propose a two-step acceleration scheme for spectral caustic rendering. Our acceleration scheme takes into account information across visible wavelengths of the scene, that is, the index of refraction (IOR) (caustic object), light power (light), and material reflectance (surface). To process visible wavelengths effectively, firstly we cluster the wavelengths which have similar first refraction (air to caustic object) directions. In this way, all the wavelengths in a cluster can be represented by one light ray during rendering. Secondly, by considering the surrounding objects (their material reflectance from and visible surface area of the caustic objects) and light power, we compute the refinement amount of each wavelength cluster. Our accelerated algorithm can produce photorealistic rendering results close to their reference images (which are generated by rendering every 1nm of visible wavelengths) with a significant acceleration magnitude. Computational experiment results and comparative analyses are reported in the paper. Springer-Verlag Berlin Heidelberg, 2014 Rendering nationallicence Caustics nationallicence Spectral nationallicence Progressive photon mapping nationallicence Tandianus Budianto gameLAB, School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-B1b-13, 36 Nanyang Avenue, 639798, Singapore, Singapore aut Johan Henry Fraunhofer IDM@NTU, Block NS1, N1-05-01, Nanyang Avenue, 639798, Singapore, Singapore aut Seah Hock School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-02a-32, Nanyang Avenue, 639798, Singapore, Singapore aut Lin Feng School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-02a-32, Nanyang Avenue, 639798, Singapore, Singapore aut The Visual Computer Springer Berlin Heidelberg 31/12(2015-12-01), 1601-1614 0178-2789 31:12<1601 2015 31 371 https://doi.org/10.1007/s00371-014-1037-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00371-014-1037-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tandianus Budianto gameLAB, School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-B1b-13, 36 Nanyang Avenue, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Johan Henry Fraunhofer IDM@NTU, Block NS1, N1-05-01, Nanyang Avenue, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Seah Hock School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-02a-32, Nanyang Avenue, 639798, Singapore, Singapore aut NATIONALLICENCE 700 1- Lin Feng School of Computer Engineering Organization (SCE), Nanyang Technological University (NTU), Block NS4, N4-02a-32, Nanyang Avenue, 639798, Singapore, Singapore aut NATIONALLICENCE 773 0- The Visual Computer Springer Berlin Heidelberg 31/12(2015-12-01), 1601-1614 0178-2789 31:12<1601 2015 31 371