The parameterizer is one of the two ways Simplygon generates new UVs, the other being the chart aggregator. The parameterizer unwraps a whole new set of unique UVs based on the connectivity of the geometry. It is usable through the ReductionProcessor, RemeshingProcessor, or AggregationProcessor, and also through the standalone Parameterizer tool.
Setting the maximum allowed stretch will determine the texture coordinate charts. A large stretch tolerance will create larger charts consisting of more triangles but a larger "UV to 3D" triangle area disparity. The distance between the charts in the atlas is determined by the gutter space. The parameterizer creates unique texture coordinates for all the triangles.
The Parameterizer can be used through the following entry points: