VolumeRendering
Ring Artifacts
← Pre- and Post- Classification | ● | Preintegration →
Observation: With non-linear TF in combination with high opacities ring artifacts occur.
- Reason #1: the sampling rate is too low, to capture the non-linear change of the TF from one voxel to another.
- Reason #2: the approximating assumptions for the numnerical integration do not hold for high opacities.
Solution: oversampling of voxels!
2-times and 4-times oversampling:
Problem: required oversampling factor is proportional to the maximum absolute value of the derivative of the TF! → bad performance drop