Could you provide an example that manifoldness is violated by these operations?
@Qwerty Here's a thread that illustrates an edge collapse operation gone wrong. In short, the edge collapse operation may not preserve manifoldness if, on one side of the collapsed edge, two edges merge into one. This is demonstrated in this figure:
The red edge is being collapsed, and the blue/yellow edges are being merged. In this case, a fin appears on our mesh after the edge collapse operation.
Could you provide an example that manifoldness is violated by these operations?
@Qwerty Here's a thread that illustrates an edge collapse operation gone wrong. In short, the edge collapse operation may not preserve manifoldness if, on one side of the collapsed edge, two edges merge into one. This is demonstrated in this figure:
The red edge is being collapsed, and the blue/yellow edges are being merged. In this case, a fin appears on our mesh after the edge collapse operation.