The Random Map node can be used to generate randomness from a connected texture map node across object instances. It is often used in conjunction with a Random Color Texture node to add more control over the random pattern which includes a Random Seed, Input Scale, and Noise Function parameter (figure 1).


Random Map

Figure 1: The Random Map node connected to a Gradient Map node used to randomize color across instances scattered on a surface


Random Map Parameters

Input -Texture - Specifies the texture used to generate randomness.

Input Scale - Controls the scale factor for the input texture.

Noise Function - Determines the mathematical algorithm used to generate the random values. 

  • Perlin - Standard Perlin noise function which is a type of gradient noise with values ranging from -1 to 1. 
  • Unsigned Perlin - A Perlin noise function with values ranging from 0 to 1.
  • Cell - Generates a cellular noise structure with a range from 0 to 1. 
  • Hash - A pseudo-random number generator noise pattern with a range from 0 to 1.