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复杂环境光源下虚实融合光照实时计算

DOI: 10.11834/jig.20091033

Keywords: 复杂环境光,虚实融合,光照一致,实时绘制

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Abstract:

在互动电子游戏、增强现实等对实时计算要求很高的交互式图形应用中,大量使用复杂环境光源对虚拟物体进行照明,使其和真实场景的光照一致,虚实融合。提出了用CookTorrance光照模型进行虚实场景的光照计算;利用球面调和基函数的方法,实时地计算高动态范围环境映射光照系数,得到高动态范围环境映射的二次多项式表达形式,在着色器计算该式得到漫反射分量;通过环境映射技术对镜面反射进行模拟,全部光照计算在GPU中完成。实验结果表明,该方法在动态变化的复杂环境光源下,完成对虚拟物体光照实时计算,绘制速度每秒30帧以上,绘制结果具有较强的真实感。

References

[1]  Debevec P.Rendering synthetic objects into real scenes:bridging traditional and image-based graphics with global illumination and high dynamic range photography[A].In:Proceedings of Computer Graphics Proceedings,Annual Conference Series,ACM SIGGRAPH[C],Orlando,FL,USA,1998:189-198.
[2]  Blinn J F,Newell M E.Texture and reflection in computer generated images[J].Communications of the ACM,1976,19 (10):542-547.
[3]  Ramamoorthi R,Hanrahan P.An efficient representation for irradiance environment maps[A].In:Computer Graphics Proceedings,Annual Conference Series,ACM SIGGRAPH[C],LOS Angeles,CA,USA,2001:497-500
[4]  Kajiya J T.The rendering equation[A].In:Computer Graphics Proceedings,Annual Conference Series,ACM SIGGRAPH[C],Dallas,TX,USA,1986:143-150.
[5]  Debevec P.A tutorial on image-based lighting[J].IEEE Computer Graphics and Applications,2002,22(2):26-34.
[6]  Greene N.Environment mapping and other applications of world projections[J].IEEE Computer Graphics & Applications,1986,6(11):21-29.
[7]  Ai Zu-liang,Peng Geng,Zhang Li-min.A technique to evaluate irradiance environment maps using graphics hardware[J].Journal of Image and Graphics,2008,13(5):972-976.[艾祖亮,彭耿,张立民.基于图形硬件的辐照度环境纹理图的计算方法[J].中国图象图形学报,2008,13(5):972-976.]
[8]  Cook R L,Torrance K E.A reflectance model for computer graphics[A].In:Computer Graphics Proceedings,Annual Conference Series,ACM SIGGRAPH[C],Dallas,TX,USA,1981:307-316.
[9]  Ngan A,Durand F,Matusik W.Experimental analysis of BRDF models[A].In:Proceedings of the Eurographics Symposium on Rendering,EGSR[C],Konstanz,Germany,2005:117-226.
[10]  Sloan P.Stupid spherical harmonic (SH)ticks[A].In:Game Developer\'s Conference,GDC[C],San Francisco,CA,USA,2008.

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