Academic Journal
View-dependent precomputed light transport using nonlinear gaussian function approximations
| العنوان: | View-dependent precomputed light transport using nonlinear gaussian function approximations |
|---|---|
| المؤلفون: | Paul Green, Jan Kautz, Wojciech Matusik, Frédo Durand |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://www.merl.com/reports/docs/TR2006-028.pdf. |
| سنة النشر: | 2006 |
| المجموعة: | CiteSeerX |
| مصطلحات موضوعية: | Graphics, Three-Dimensional Graphics and Realism— Color, Shading, Shadowing and Texture Keywords, Precomputed Radiance Transfer, Reflectance Field, Real-Time Rendering |
| الوصف: | We propose a real-time method for rendering rigid objects with complex view-dependent effects under distant all-frequency lighting. Existing precomputed light transport approaches can render rich global illumination effects, but high-frequency view-dependent effects such as sharp highlights remain a challenge. We introduce a new representation of the light transport operator based on sums of Gaussians. The nonlinear parameters of our representation enable 1) arbitrary bandwidth because scale is encoded as a direct parameter, and 2) high-quality interpolation across view and mesh triangles because we interpolate the mean direction of the Gaussians, thereby preventing linear cross-fading artifacts. However, fitting the precomputed light transport data to this new representation requires solving a nonlinear regression problem that is more involved than traditional linear and nonlinear (truncation) approximation techniques. We present a new data fitting method based on optimization that includes energy terms aimed at enforcing artifactfree interpolation. We demonstrate that our method achieves high visual quality with a small storage cost and an efficient rendering algorithm. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.64.8845; http://www.merl.com/reports/docs/TR2006-028.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.64.8845 http://www.merl.com/reports/docs/TR2006-028.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.96FEC00 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |