PRISM: An open source framework for the interactive design of GPU volume rendering shaders
Fig 8
(a) The original CTA volume rendered with Blinn-Phong shading. (b) Volume containing precomputed blood flow information, i.e. distance, within vessels, between entry and exit of blood from the brain. (c) Volume from (b) combined with (a) using the Volume shader of Algorithm 6. When the time parameter is updated to render each frame, the waves move along the vessels in the direction of the blood flow as illustrated in the accompanying video (S1 Video).