Hi PaQ,
> Those automatic system also create very dense mesh, and doesn't really care about creating
> loops along sharp edges to keep tension right.
One of the areas that the existing automatic systems tend to have difficulty with is trying to deal with changes in scale, like when small detailed features are close by larger undetailed flat areas.
They often tend towards trying to make uniform sized quads throughout the whole thing, and then in order to capture some smaller details that uniform target size has to be pretty small.
One of the difficulties with trying to do similar things to CAD models is that CAD models can very often have that type of scale changes for different features like little cut out areas inside of a big flat plane.
Usually when an artist is doing retpology work they are using a lot of skill and judgement to guide the topology that is being created. Processes that require that type of judgement about them tend to be fundamentally difficult to automate, it's like trying to create artificial intelligence...
- Michael
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