# Measurement Modifiers

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Measure Angle
This Channel Modifier type can be used to measure the angle formed between any three 3D items in the scene.

Position From
: Link the World Position transform channel of a 3D item or the Position transform output of another Channel Modifier item into this channel.

Position To A
: Link the World Position transform channel of a second 3D item or the Position transform output of another Channel Modifier item into this channel.

Position To B
: Link the World Position transform channel of a third 3D item or the Position transform output of another Channel Modifier item into this channel.

Angle Output
: The floating point angle between the three items is output to this channel.

Measure Distance
The 'Measure Distance' Channel Modifier can be used to measure the distance between any two items in the scene.

Position From: Link the World Position transform channel of a 3D item or the Position transform output of another Channel Modifier item into this channel.

Position To
: Link the World Position transform channel of a second 3D item or the Position transform output of another Channel Modifier item into this channel.

Note
: Leaving either of these input channels un-linked will output the distance from the world origin.

Measure Speed
The 'Measure Speed' Channel Modifier takes a Transformation Matrix (such as world position) and outputs a single value, representing the overall speed of the input item, measured in meters per second. A blue line is drawn in the viewport with the numerical readout, providing a simple visual representation of the speed.

World Position: Link the world position matrix of the moving item into the 'World Position' input of the Measure modifier.

Speed: The 'Speed' of movement from the input item is calculated per frame in meters per second.

Measure Velocity
The 'Measure Velocity' Channel Modifier takes a Transformation Matrix (such as world position) and outputs a vector, representing the velocity of the input item. Each output of the vector represents the speed of the item in each axis, measured in meters per second. A blue line is drawn in the viewport, providing a simple visual representation of the velocity.

World Position: Link the world position matrix of the moving item into the 'World Position' input of the Measure modifier.

Velocity X/Y/Z: The 'Speed' of movement from the input item is calculated per frame in meters per second and output as a vector for each axis.

Dave M May 23, 2014 at 5:45 AM

Where are these channel modifiers located?

Dave M May 23, 2014 at 5:53 AM

Okay, I found it under Channel Modifiers. But how come I can't input the positions of two locators to it?

Dave M May 23, 2014 at 6:06 AM

Okay, I found World Position Channel, and exposed it, and connected that to the Distance Between node.

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