OpenGL Insights

308 III Bending the Pipeline

F inally, voxel fragments are written directly from the fragment shader into their

corresponding voxel inside the destination 3D texture, where they must be com-

bined. This is done using image load/store operations as detailed in Section 22.4.2.

22.4.1 Conservative Rasterization

Although it is very simple, this approach does not ensure a correct thin (6-separating

planes [Schwarz and Seidel 10]) voxelization. This is due to the fact that only the

coverage of the center of each pixel is tested against the triangles to generate frag-

ments during the rasterization step. Thus, a more precise conservative rasterization

must ...