# Input
These nodes get data sent by a tablet and its stylus, such as pressure or altitude. However, some nodes can only be used with
specific stylus. All these nodes gives a Float result.
## Pressure
Pressure is undoubtedly the most well-known use of a graphic tablet. Pressure is the force you put onto the tip of your stylus
to increase or decrease one or several parameters of a brush (size, flow, etc).
Typically, in the case below, the size of the brush will get bigger or smaller, depending on the pressure of the stylus on the
tablet.
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## Altitude
Altitude is also sometimes called “Tilt” in other painting software. It corresponds to the angle of the stylus relative to the
graphic tablet.
“Get Stylus Altitude” gives a Float value between 0° (stylus is horizontal) and 90° (stylus is perpendicular). This node can be
used to be converted into an Integer and make subtle color changes when you paint.
“Get Stylus Altitude Normalized” gives a Float value between 0 (stylus is horizontal) and 1 (stylus is perpendicular). As an
example, it can be used to affect the size of a brush.
*In the example above, the altitude of the stylus is used twice : “Get Stylus Altitude Normalized” is combined with
“Get Size Modifier” - which affects the size of the brush, and “Get Stylus Altitude” affects the luminosity of the brush.*
*Result*
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## Azimuth
Let’s imagine your stylus is a clock hand, and its tip is the center of that clock. When you rotate the stylus clockwise or
counter-clockwise, the information sent by your graphic tablet is what we call the Azimuth.
“Get Stylus Azimuth” gives a Float value between 0° and 360° (or, actually, 359,99°). 0° corresponds to Noon | 90° corresponds
to 3 o'clock | 180° corresponds to 6 o'clock | 270° corresponds to 9 o'clock.
“Get Stylus Azimuth Normalized” gives a Float value between 0 and 1 (where 0 = 0° and 1 = 360°).
A concrete example where Azimuth is used to modify the brush angle and hue :
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## Twist
Twist is the rotation of the stylus on its own axis. If you use a Wacom graphic tablet, these nodes will require a specific
stylus (Pro Art Pen).
“Get Stylus Twist” gives a Float values between 0° and 360° (actually, 359,99°). If you’re right-handed, and if we use the side
buttons as references :
*0° (your thumb is on buttons)*
*90° (your index is on buttons)*
*180° (buttons are hidden in your hand)*
*270° (buttons just behind your thumb)*
“Get Stylus Twist Normalized” gives values between 0 and 1 (0 = 0° and 1 = 360°).
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## Need more help with stylus tablet ?
Feel free to [watch this tutorial on YouTube](https://youtu.be/JfwBYgN00vQ) to know how to use Tablet nodes.
[](https://youtu.be/JfwBYgN00vQ)
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## Keys Down
An Odyssey Brush can include shortcuts to call variations or different settings. For instance, you could switch between 2 different
stamp, modify the color of a brush or its the size.
To add a shortcut, you must first add a variable "Key":
You can then either choose the key among the list:
Or click on the tiny button on the left, then select the input to be used (mouse our keyboard):
In your Blueprint, add the node "Contains item" in the Utilities > Array categories and connect it to "Get Keys Down" and
the variable you have just created. You must then connect it to a node "Branch", which the outputs "True" and "False"
will be connected to different nodes Stamp.
Iliad User Documentation 
