Difference Between setHex and setStyle in Three.js

In Three.js, the THREE.Color class provides several methods to update the color of a material. This article explains the key differences between material.color.setHex() and material.color.setStyle(), highlighting their distinct input formats, performance characteristics, and ideal use cases to help you choose the right method for your 3D application.

Understanding the Two Methods

While both methods ultimately update the RGB values of a Three.js material, they differ entirely in the type of arguments they accept and how they process those values.

1. material.color.setHex()

The setHex() method updates the material’s color using a hexadecimal number (integer).

• Input Format: It expects a number in the 0xRRGGBB format.

• Syntax Example:

  material.color.setHex(0xff0000); // Sets the color to bright red

• Performance: This method is highly performant. Because the input is already a raw number, Three.js can directly extract the red, green, and blue channels mathematically without any string parsing.

• Best Use Case: Use setHex() when working with hardcoded color values, math-driven color generation, or in performance-critical rendering loops where colors change frequently.

2. material.color.setStyle()

The setStyle() method updates the material’s color using a CSS-style string.

• Input Format: It accepts standard CSS color strings, including color names, hex strings, RGB, RGBA, HSL, and HSLA.

• Syntax Examples:

  material.color.setStyle('red');
  material.color.setStyle('#ff0000');
  material.color.setStyle('rgb(255, 0, 0)');
  material.color.setStyle('hsl(0, 100%, 50%)');

• Performance: This method is slower than setHex(). Behind the scenes, Three.js must use regular expressions to parse the string, identify the format, and convert the values into a normalized 0-1 range for the GPU.

• Best Use Case: Use setStyle() when integrating Three.js with web APIs, CSS variables, HTML color pickers (<input type="color">), or when handling user-inputted color strings.

Comparison Summary