# Exp Scalar

## Overview[edit]

The Exp family of nodes output the exponential value of the shader or function nodes assigned to the Main input. The exponential value is the mathematical constant e raised to the power of the Input value i.e. e to the power of Input. e has a value of approximately 2.7182818.

For colours the calculation is done on a component-wise basis, for example:

Output.red = e **to the power of** Input.red

Output.green = e **to the power of** Input.green

Output.blue = e **to the power of** Input.blue

These nodes have no other settings apart from the Input node.

**Settings:**

**Name:**This setting allows you to apply a descriptive name to the node, which can be helpful when using multiple Exp scalar nodes in a project.**Enable:**When checked, the node is active, and when unchecked the node is ignored.

A shader is a program or set of instructions used in 3D computer graphics to determine the final surface properties of an object or image. This can include arbitrarily complex descriptions of light absorption and diffusion, texture mapping, reflection and refraction, shadowing, surface displacement and post-processing effects. In Terragen 2 shaders are used to construct and modify almost every element of a scene.

A single object or device in the node network which generates or modifies data and may accept input data or create output data or both, depending on its function. Nodes usually have their own settings which control the data they create or how they modify data passing through them. Nodes are connected together in a network to perform work in a network-based user interface. In Terragen 2 nodes are connected together to describe a scene.

A scalar is a single number. 1, 200.45, -45, -0.2 are all examples of scalar values.