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A Spherical Volume Rendering Method Supporting Viewpoint Roaming in 3D Volume Data

The invention discloses a spherical body drawing method supporting three-dimension data inner viewpoint roaming. The method includes the following steps that spherical face coordinates are used for expressing a spherical agent geometry which constructs data of a three-dimension body and using the spherical agent geometry as a carrier to construct veins of the three-dimension body; In the process of light ray casting, the relative position of the current viewpoint and the spherical agent geometry is judged, if the current viewpoint has entered the spherical agent geometry, the current viewpoint serves as an initial point of a light ray integral, calculation is carried out with an intersection algorithm of a line and a ball, an effective intersection point of light rays and the spherical agent geometry is obtained and the effective insertion point serves as a terminal point of the light ray integral. If the current viewpoint did not enter the spherical agent geometry, the intersection algorithm of the line and the ball is directly used for calculating out two effective intersection points of the light rays and the spherical agent geometry and the obtained two effective intersection points serve as the initial point and the terminal point of the light ray integral. Afterwards, the light ray integral is calculated, a final image is obtained and the body data inner viewpoint roaming effect is achieved.
Owner:ZHEJIANG UNIV
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