In this post I want to talk about ZRemesher. ZRemesher is a very handy and easy tool to use in Zbrush. When making a model it is easy to go and make a model with a few hundred thousand to a couple million polygon count, the problem with that is if you try to bring that model into a film or game engine, you would not be able to move or work with such a model. ZRemesher fixes the problem of having a high polycount model. Also for those who do not know about polygons on a model, think of it like a wire frame over an object. Basically ZRemesher takes a high polycount model and retopologizes the the model so there is more surface quality and less polygons. In basic terminology you can have a low poly model that looks like a high poly model when using ZRemesher.

When you want to use ZRemesher and Retoplogize the model, the first step is to copy your model and rename the copy so you know that will be the low resolution model that you want to bring in another program. After go to the geometry tab and find ZRemesher. Change the the adaptive size to 100 so the program can use the model more effeciently by using more polygons in a smaller space and larger ones in a bigger space. Take the target polygon count down to see how little polygons you need to keep the basic shape of the model, and hit the ZRemesh button. Select the low Res model but have the high res model turned on also, and go to the subtool project so you can see it and you also want to see the divide button in the geometry tab. Change the distance slider in the project area, so it can look at the gaps between the models and fill it in. Hit the project all button, then the divide button and than hit the project all button again and do this for a few subdivisions. Your highest subdivision level can have a higher polycount than the high res model but that is fine, because you only need to export the level one subdivision. The level one subdivision will than be exported into another program and as long as you have done normal and displacement maps of the high res model, the low res model will look just like the high res but with far fewer polygons.

Now, I know that one could use Zspheres  to retopologize the model to make the polycount even lower than it would be when using ZRemesher, but I think that the model in wire frame mode looks a lot cleaner when using ZRemesher and I think it quads the polygons better.