%0 Conference Proceedings
%A Ting, Wu Shin,
%A Vidalón, José Elías Yauri,
%A Watanabe, Lionis de Souza,
%T Snapping a Cursor on Volume Data
%B Conference on Graphics, Patterns and Images, 24 (SIBGRAPI)
%E Lewiner, Thomas,
%E Torres, Ricardo,
%8 Aug. 28 - 31, 2011
%J Los Alamitos
%I IEEE Computer Society Conference Publishing Services
%K 3D Interactions, Ray-casting, Volume visualization, 3D medical images.
%X In this paper we explore the architecture of GPU-based volume ray-casting to control the cursor movements on surfaces of volume data only on the basis of their sampled scalar values. This method does not rely on building a tight proxy geometry nor computing local iso-surface parametrization. In this setting only a few instructions should be included in a ray-casting shader: at every fragment the depth of the closest non-transparent voxel along each viewing ray is calculated and stored in the depth buffer. Its application in the manipulation of 3D medical images has, however, a broad spectrum. Two of them are presented. The proposed technique is very simple and fast, yet produces very nice and intuitive visual feedbacks.