•Volume
is sampled using proxy geometry
•Polygons
slice through the volume perpendicular to the viewing
direction
•Number
of slices determines quality of resulting image
•Slices
usually drawn back to front
•Compositing
performed using alpha blending
–“over”
operator: C’i = Ci + (1 – Ai) C’i+1
–uses
a lot of framebuffer bandwidth