The Zbrush tool that I decided to talk about for this blog post is ZRemesher. For this research assignment, I looked up ZRemesher on Google and I got a lot of videos describing the workflow and some documents from the ZBrush website. I ended up reading all of the Zbrush documents and an article about the workflow expected with it. There are articles that talk about the differences between Dynamesh and ZRemesher. It is suggested that you use Dynamesh before using ZRemesher because ZRemesher retopologizies your geometry so it can be cleaner with more quads. ZRemesher is a faster solution to retopologizing in Zbrush, which allows for more control. ZRemesher allows you to control your polygon density and the symmetry on your models with the retopology.
ZRemesher allows you to work with PolyGroups that use edge loops as borders, which can be tested on models to see it works well or not. Curve Strength settings are another thing you can adjust to put partial or complete edge loops at curve positions, but it is not always accurate unless you go back and edit. The pitfall of using ZRemesher and its automatic algorithm is that it can produce spirals that break the model even if your PolyGroups are clean. It is more common to see the spirals in tubular shaped areas. You can use the ZRemesher Guide Brush to fix the issue when increasing the Curve Strength.
The Adaptive Size slider defines how the polygons are distributed for your model by making a vertex ratio based on the mesh’s curvature. The vertex ratio that is created makes the algorithm more flexible, but it also allows for ZRemesher to increase the topology density wherever it is needed. Low Adaptive Size settings produce square polygons that are similar in size while high Adaptive Size settings produce polygons that are better suited to the mesh’s curvature and different polygon densities. It is a setting that it is better to play around with because it depends on if you want your model to look more defined or not. ZRemesher analyzes the mesh curvature and tries to match the shape of the model depending on the polygon count it is given.
ZRemesher allows for partial mesh retopology by isolating polygons. Keyboard shortcuts also allow for ZRemesher to use symmetry when retopologizing your models. It is better to have a low subdivision levels before running the ZRemesher because it takes up a lot of memory when creating new topology over your existing model. It is also best to not have holes in your models because it can increase the polygon count and break your model later on. You are also able to transfer high polygon details to a remeshed model with the Freeze Subdivision Level.
Overall, ZRemesher is a good retopology tool to use for Zbrush models. The tool tries to match the curvature on your original mesh while allowing further modifications to be made to it. The adjustments you can make to its algorithm with the Curve Strength settings and the Adaptive Size slider allows for your models to be more detailed and clean. Prior to this research, I never knew what ZRemesher was or its capabilities even though I have heard the word used. Zbrush is a complex program with many powerful tools that can be used to make clean models from start to finish. ZRemesher is one of those tools that can make models clean and detailed regardless of when and where it is used.
ZRemesher applied to model after being sculpted in Zbrush.
The ZRemesher Guide Brush allows for the curves to be drawn out on the model so spirals can be avoided.
The Freeze Border used on the right model allowed to it to have a higher polygon density after going through the ZRemesher tool.
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