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I am using blender on a tablet, for those times when I can't plug a mouse into the tablet, I would like to still be able to zoom in and out on the viewport.

What ways are there to zoom in and out other than using the mouse wheel? I can't find any buttons or input boxes in the user interface that control the zoom of the view port.

Is it possible to enter a value somewhere for how far in or out the viewport is zoomed?

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The simplest way to zoom with a tablet, in my opinion, is to use Emulate 3 Button Mouse from File > User Preferences > Input.

This allows you to zoom in and out with Alt+Ctrl+LMB enter image description here drag.

Then you can also orbit with Alt+LMB enter image description here drag. And you can pan with Shift+Alt+LMB enter image description here drag.

Emulate 3 Button Mouse

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There are a number of ways to control the viewport zoom without access to a three-button mouse:

  • You can use keyboard to zoom in and out by using numpad + and numpad -. If you don't have a numpad on your keyboard, you can set Blender to emulate the numpad under User Preferences > Input > Emulate Numpad.

  • If you are using Blender on a tablet (or on a computer with a touchscreen), you can zoom in and out by using two fingers on the screen and moving them closer or farther away from each other, just like with other mobile applications.

That being said, you can purchase a three button mouse separately, and use that to manipulate the viewport. If you are going to be using Blender heavily on a device with no third-mouse-button, this can make an enormous difference. For tablets specifically, you can get a wireless mouse with Bluetooth connectivity.

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  • $\begingroup$ No number pad a notebook/laptop $\endgroup$ – gman Dec 18 '18 at 13:34
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Click on contact

Setup your the graphics tablet to click when the tip is pressed. Then the other two buttons can be set to right and middle click. Now just use the default CTRL+middle-mouse key-binding (can be customised user preferences).

  • On GNU/Linux see the "TPCButton" and "ButtonM" settings in man wacom.

Gestures

Additionally/Alternatively you can use a gesture-recognition application to convert gestures into keyboard/Blender commands.

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