Title: | Fresnel term approximations for metals |
Authors: | Lazániy, István Szirmay-Kalos, László |
Citation: | WSCG '2005: Short Papers: The 13-th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2005 in co-operation with EUROGRAPHICS, p. 77-80. |
Issue Date: | 2005 |
Publisher: | Václav Skala - UNION Agency |
Document type: | konferenční příspěvek conferenceObject |
URI: | http://wscg.zcu.cz/WSCG2005/Papers_2005/Short/!WSCG2005_Short_Proceedings_Final.pdf http://hdl.handle.net/11025/11214 |
ISBN: | 80-903100-9-5 |
Keywords: | oboustranná distribuční odrazová funkce;Fresnelův term;Schlickova aproximace |
Keywords in different language: | bidirectional reflectance distribution function;Fresnel term;Schlick's approximation |
Abstract: | Colored reflections are governed by the Fresnel term, which can be expressed from the refraction index of the material. This function, especially for metals where the refraction index becomes a complex number, is rather computation intensive. This paper presents an accurate simplification, which can also cope with complex refraction indices. In order to establish the approximation, Schlick’s formula is rescaled and the residual error is compensated by a simple rational approximation. The resulting formula can present realistic metals and is simple enough to be implemented on the vertex or pixel shader, and used in games. |
Rights: | © Václav Skala - UNION Agency |
Appears in Collections: | WSCG '2005: Short Papers |
Files in This Item:
File | Description | Size | Format | |
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Lazanyi.pdf | Plný text | 225,78 kB | Adobe PDF | View/Open |
Please use this identifier to cite or link to this item:
http://hdl.handle.net/11025/11214
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