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ZBrush Specular Map Painting Tutorial

By Kashif Riley
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Date Added: 18th August 2009
Software used:
ZBrush
Hello everyone, I have decided to take the initiative and create a small tutorial on visualising specular values on a ZBrush mesh. Mudbox 2009 will have this, too, but I want to demonstrate how to see different specular values that will look proper in a renderer, such as Mental Ray.

First of all, I'd like you all to meet Mr. Frogman, who has kindly volunteered to help out (and I'm hoping he forgives me for cutting off his body).

The purpose of this tutorial is to help people who have asked on ZBrushcentral.com how to actually see the specular map in real time - well, the values anyway. As part of my pre-ZBrush workflow I had to paint in Photoshop in a messy way, save, and then look at the model in my 3D programme by rendering. But the way I'm going to show you here is a little trick that I've learned, using a custom material that I'll be happy to share with you. I'm assuming you're all already familiar with the ZBrush interface, so let's get started.

First, import an OBJ or load an existing SubTool and draw it on the canvas. Then make it live by pressing Edit, or the T key (Fig.01).

1231_tid_Step-1.jpg
Fig. 01

Change the current material from MatCap Red Wax to MatCap Metal02 (Fig.02a - b).

1231_tid_Step-2a.jpg
Fig. 02a

1231_tid_Step-2.jpg
Fig. 02b


Fill the object with a low grey colour; in my case I chose the values 64, 64, 64, which is 25% grey in Photoshop - a nice slippery grey perfectly suited to Mr. Frogman (note: you can also Mask by Cavity first and then fill, but I find it's better to do all of this from a Cavity Map and then blend the image into the specular map) (Fig.03).

1231_tid_Step-3.jpg
Fig. 03

You should see the model in the viewport. Now just paint with a low RGB strength (I usually use values between 1 and 5 to get a neat gradual tone, and white) and you'll see the model's skin look as if it's specular in different spots (Fig.04). Don't forget to turn off ZAdd before you do this.

1231_tid_Step-4.jpg
Fig. 04



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(ID: 180093, pid: 0) Jonathan Noguera on Tue, 05 February 2013 8:39pm
Neat trick, a very fast and accurate tutorial, so I like thanks.
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