When you are creating digital sculptures or working with digital illustrations in ZBrush, you are going to be working on the canvas, which is at the center of the ZBrush interface. Using the controls in the Document menu, you can establish the size of the canvas and the background color. So I'm going to start ZBrush, and when ZBrush starts, you will be presented with this screen that ask you, what you would like to do. Press Other to get a blank canvas and you can use the controls right here to zoom out and to reposition the canvas in the interface.
To change the size of the canvas, go to the Document menu and you will find these two sliders right here. If I change these, these will establish my document size. Now, by default the Pro button is enabled. This is the Constrain Proportions button. So that means when I change one slider, the other will update automatically to maintain the same proportions. If I wanted to create a custom size or custom proportion, I just turn this off and then I can change these sliders to whatever I would like.
Once I have got the size that I want, I just press the Resize button. I can zoom out here and now I have my new canvas size. If you want to change the background color, you can also do this using the controls in the Document menu. This Back button right here, is what you want to click on and when you click on it, you get the Picker and the Picker allows you to select any color that's on the interface. It's most useful if you select from the Color Picker but you can really pick anything you want.
I'm going to pick a nice deep red here, and as you will notice, it's a Gradient. You can change the settings of the Gradient. If I want a flat color for my background, I can set the Range slider to 0, and now I have a flat red color. If I move this up to 1, I have a very high contrast gradient. The Center slider allows you to change the center of the gradient and the Rate allows you to change the smoothness of the gradient.
So these are the basic controls for the canvas in ZBrush, and when you are starting an illustration in ZBrush, you want to set the background color because it is part of the actual illustration and the canvas size at the beginning of the project.
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