It is a moiré sample attributable to aliasing. In your examples, the Moiré patterns happen when a repetitive sample of excessive spatial frequency is sampled at low decision.
Contemplate the Wikipedia instance reference picture:
The bricks kind a repetitive sample. As a result of there’s many bricks, the ensuing texture has a excessive spatial frequency. Here is the identical picture with a diminished decision:
Reducing the decision has lowered our pattern fee to the purpose that an apparent moiré sample happens. As a result of there are fewer pixels, info has been misplaced. And since the brick texture is not completely aligned to the pixel grid, the knowledge is not misplaced evenly – some bricks lose extra crimson brick pixels than their neighbors & the equally for the white mortar pixels. This places the periodic spatial sign of the brickwork out of section. The edge for this drawback is decided by the Nyquist–Shannon sampling theorem.
Mipmapping can be utilized to cut back the artifacts on moiré susceptible textures. However in your Minecraft instance, the ‘texture’ is successfully made throughout a number of blocks, so it will probably’t be mitigated by mipmaps. Spatial anti-aliasing might assist, however solely to a degree as we’re restricted by the finite nature of the display. Usually talking, the objective is to get one thing that is ok by some mixture of graphics methods (to reduces the artifacts), artwork / texture selections (to keep away from error susceptible visuals) and sport design (to make occurrences transient &/or much less impactful).
