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title: "Phoenix FD TP Sample operator"
canonical: "https://documentation.chaos.com/space/PHX4MAX/124496778/Phoenix%20FD%20TP%20Sample%20operator"
format: markdown
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This page provides information on the Thinking Particles Phoenix FD Sample operator.

## **Overview**

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<span style="color: #202124">The Phoenix FD Sample operator allows you to extract </span><span style="color: #202124">**Grid Channel**</span><span style="color: #202124"> data from the Phoenix Simulator. For example,  the Speed channel can be sampled and transferred to a vertex color map for a mesh instance.</span>

 

## **Inputs**

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## **Outputs**

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> Macro (ui-text-box)
> 
> To successfully sample a Phoenix Simulation's Grid channel, the respective channel export should be enabled under the [Output](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAX/pages/125279638) rollout of the Phoenix Simulator.
> 
> If the channel is not present, the TP Sample operator will return a value of 0.
> 
> You can find more information about the ranges of the grid channels in the [Grid Channel Ranges](https://docs-chaos.atlassian.net/wiki/spaces/PHX4MAX/pages/125083219) page.

**Velocity** [ vector ] – Returns the Velocity vector at the sampled **Position**.

**Smoke** [ scalar ] – Returns the value of the Smoke channel at the sampled **Position**.

**Temperature** [ scalar ] – Returns the value of the Temperature channel at the sampled **Position**.

**Fuel** [ scalar ] – Returns the value of the Fuel channel at the sampled **Position**.

**Color** [ vector ] – Returns the RGB channel value at the sampled **Position**.

**Viscosity** [ scalar ] – Returns the Viscosity channel value at the sampled **Position**.

**Speed** [ scalar ] – Returns the Speed channel value at the sampled **Position** - the Speed represents the magnitude of the Velocity.

 

## **Parameters**

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