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1 1998

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Interactive volume rotation

Csebfalvi B., Szirmay-Kalos L.

Machine Graphics and Vision

1998

Vol. 7, No. 4

793-806

In this paper a new volume rendering method is presented which provides real-time rotation without using any acceleration hardware. The algorithm is based on the efficient handling of empty voxels, where according to the opacity values a 3D binary mask is generated indicating the locations of the non-transparent voxels. Ray casting is performed on this binary mask which is rotated rapidly by shear-warp factorization and an incremential aligment technique. The location of non-zero bit hit by a ray is mapped onto the corresponding voxel location in the orginal classified volume, in order to get the opacity and color values in the given samples point. The technique proposed for rotating and sampling the binary mask exploits only the standard ALU operations providing interactive frame rates even on low cost machines.