Currently, If view from the ray origin:
o ------> 1 1 1 1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1 1 1 1 which generates 2 surfaces when extracting 0 level set, the first surface before the surface, the second surface is the surface we want. After the change:
o ------> 1 1 1 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -1 -1 -1 -1 which will now generates only 1 surface when extracting 0 level set.
Currently, If view from the ray origin: o ------> 1 1 1 1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1 1 1 1 which generates 2 surfaces when extracting 0 level set, the first surface before the surface, the second surface is the surface we want. After the change: o ------> 1 1 1 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -1 -1 -1 -1 which will now generates only 1 surface when extracting 0 level set.