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

Abstract

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.

Description

technical field [0001] The invention relates to a spherical body rendering method supporting the roaming of the internal viewpoint of three-dimensional volume data, which belongs to the field of graphic rendering. Background technique [0002] Ray-casting is a volume rendering technique mainly applied to three-dimensional spatial data fields. No need to construct intermediate primitives, by classifying the volume data, assigning different colors and opacity values ​​to different categories, and then performing light integration along each ray, and obtaining the corresponding color by looking up the volume data value at the position of the ray through the transfer function Optical properties such as opacity and opacity are mixed and accumulated, and a two-dimensional image is directly generated on the screen from the three-dimensional data field. Its main advantage is that it can display the surface information and internal structure information of volume data, which is bene...

AI Technical Summary

Problems solved by technology

As another example, take the simulated driving scene where the Air Force's aircraft travels through the real clouds as an example. When the aircraft passes through the clouds, it is inside the clouds, and the traditional volume data observation and operation methods cannot be applied.

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