# What is Perlin noise?

## What is Perlin noise?

Perlin noise is a procedural texture primitive, a type of gradient noise used by visual effects artists to increase the appearance of realism in computer graphics. The function has a pseudo-random appearance, yet all of its visual details are the same size.

### Why does Perlin make noise?

Perlin noise can be used to generate various effects with natural qualities, such as clouds, landscapes, and patterned textures like marble. Perlin noise has a more organic appearance because it produces a naturally ordered (“smooth”) sequence of pseudo-random numbers.

#### What does Perlin noise return?

PerlinNoise returns a “float Value between 0.0 and 1.0” yet warns that “it is possible for the return value to slightly exceed 1.0f”.

**What is voronoi noise?**

The idea of Voronoi noise is that space is somehow filled with an arbitrary amount of points. The noise function is equal to the distance to the nearest point anywhere. Technically the amount of points to check is infinite, but we only need to know the nearest one.

**What is a noise function?**

Noise is a function that returns a float in the range [0:1] for a certain input x (x can be a float, a 2D, 3D or 4D point but in this chapter we will only be looking at the one dimensional case. Our input position can also be positive and negative and extend from 0 to infinity or minus infinity).

## What is the output range of Perlin noise?

So the output range of your 2D Perlin noise function should be [-0.707, 0.707]. This is somehow related to the fact that both d and the interpolation parameters are a function of p .

### How does unity Perlin noise work?

Perlin Noise is essentially a grid of gradients from a minimum value to a maximum value, each rotated at a random angle. The gradients at each point are smoothed based on the surrounding points, creating a smooth wavy grid. Unity’s Mathf.

#### What is curl noise?

Perlin curl noise uses similar math to the Perlin Noise Operator, but with the addition of a curl function which allows it to generate a turbulent noise. This resulting noise is incompressible (divergence-free), which means that particles cannot converge to sink points where they get stuck.

**Is Perlin noise Tileable?**

Perlin noise is made by blending together gradients that are evenly spaced apart in a grid. By adjusting the spacing, you can change the coarseness of the generated texture. The final image will tile seamlessly if the width and height of the image are whole multiples of the cell spacing.

**What is Voronoi noise?**

## What is a Voronoi in nature?

Voronoi. A Voronoi pattern provides clues to nature’s tendency to favor efficiency: the nearest neighbor, shortest path, and tightest fit. Each cell in a Voronoi pattern has a seed point. Everything inside a cell is closer to it than to any other seed.

### What is curl in vector calculus?

In vector calculus, the curl is a vector operator that describes the infinitesimal circulation of a vector field in three-dimensional Euclidean space. The curl at a point in the field is represented by a vector whose length and direction denote the magnitude and axis of the maximum circulation.

#### What is a Voronoi texture?

The Voronoi Texture node adds a procedural texture producing a Voronoi patterns. Voronoi patterns are generated by randomly distributing points, called seeds, that are extended outward into regions, called cells, with bounds determined by distances to other points. For more information see Voronoi diagram on Wikipedia.

**How do you make a Voronoi?**

Creating a Voronoi Model

- Step 1: Import the Model. Import the model into meshmixer by opening the program and selecting “Import” on the left-hand toolbar.
- Step 2: Reduce the Mesh. Once the model is imported, reduce the mesh to make larger polygons.
- Step 3: Create the Pattern & Export.