# Implement the different color for each face of the shape which is made by extrude geometry **URL:** \ **Category:** Questions\ **Tags:** extrude-geometry\ **Created:** [December 26, 2024, 9:49am UTC](https://discourse.threejs.org/t/implement-the-different-color-for-each-face-of-the-shape-which-is-made-by-extrude-geometry/75673 "2024-12-26T09:49:48Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![hofk](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/hofk/32/44944_2.png) [@hofk](https://discourse.threejs.org/u/hofk)\ **Post date:** [December 26, 2024, 5:37pm UTC](https://discourse.threejs.org/t/implement-the-different-color-for-each-face-of-the-shape-which-is-made-by-extrude-geometry/75673/6 "2024-12-26T17:37:12Z")
The vertices are not correct. You need 3 x 3 values per triangle, whereby the rotation must be counterclockwise when viewed from the outside. ![2024-12-26 18.30.00](https://canada1.discourse-cdn.com/flex035/uploads/threejs/original/3X/7/f/7f33a8d5126ecb14e75865bf067ece0d560afee9.png) ![2024-12-26 18.30.30](https://canada1.discourse-cdn.com/flex035/uploads/threejs/original/3X/d/a/da805d6d275254dc65031df01ec4f0242b9d52b2.png) ```javascript Prism ``` It makes sense to use material groups for the different materials. * * * _.groups : Array_ _Split the geometry into groups, each of which will be rendered in a separate WebGL draw call. This allows an array of materials to be used with the geometry._ _Each group is an object of the form:_ _{ start: Integer, count: Integer, materialIndex: Integer }_ _where start specifies the first element in this draw call – the first vertex for non-indexed geometry, otherwise the first triangle index. Count specifies how many vertices (or indices) are included, and materialIndex specifies the material array index to use._ _Use .addGroup to add groups, rather than modifying this array directly._ * * * see [three.js docs](https://threejs.org/docs/index.html?q=geome#api/en/core/BufferGeometry) --- _[View the full topic](https://discourse.threejs.org/t/implement-the-different-color-for-each-face-of-the-shape-which-is-made-by-extrude-geometry/75673)._