pseudo-chromadepth color map has the advantage over the regular chromadepth range as there are already fewer colors used which could be ambiguous. The monochromatic color scheme can be used the completely eliminate this problem.

Implementation Details {#sec:implementation}
======================

Static 2D images of vascular structures are often used to analyze scans or to communicate results. However, inspecting the 3D model of these structures interactively can further increase the effectivity of the tasks carried out by domain experts. Therefore, we propose in this section an interactive GPU-based implementation of VSS.

GPU Pipeline
------------

The first step of our GPU pipeline is the rendering of the 3D vessel model. Since VSS only require a depth buffer as input, they are independent of the technique used to render the vessels model. Thus, both rasterization of triangular meshes or direct volume rendering, can be used in this step. Once the depth buffer is generated, our algorithm linearizes the depth values. Although, in our implementation, this is done in a separate pass, the linearization could in principle also be carried out during the rendering of the model.

In order to be consistent among different near and far plane configurations, we perform an additional pass to normalize 