Ray casting
Several implementations exist for ray casting. We describe the implementation used in Visualization Data Explorer. For every pixel in the output image a ray is shot into the data volume. At a predetermined number of evenly spaced locations along the ray the color and opacity va
lues are obtained by interpolation. The interpolated colors and opacities are merged with each other and with the background by compositing in back-to-front order to yield the color of the pixel. These compositing calculations are simply linear transformations.
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