# How to change vertex positions without separating edges

**URL:** <https://discourse.threejs.org/t/how-to-change-vertex-positions-without-separating-edges/62225>\
**Category:** Questions\
**Tags:** geometry\
**Created:** [March 3, 2024, 3:19pm UTC](https://discourse.threejs.org/t/how-to-change-vertex-positions-without-separating-edges/62225 "2024-03-03T15:19:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mjurczyk](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/mjurczyk/32/10995_2.png) [@mjurczyk](https://discourse.threejs.org/u/mjurczyk)\
**Post date:** [March 3, 2024, 4:06pm UTC](https://discourse.threejs.org/t/how-to-change-vertex-positions-without-separating-edges/62225/2 "2024-03-03T16:06:49Z")

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1. If applicable, open the model in blender and make sure vertices are not disconnected there.
2. If non-applicable, make sure you’re using an indexed geometry - non-indexed geometries triangles are separated (you can use [BufferGeometryUtils.mergeVertices](https://threejs.org/docs/?q=buffergeom#examples/en/utils/BufferGeometryUtils.mergeVertices) to approximate an indexed geometry from a non-indexed one. Also, [a related longer thread](https://discourse.threejs.org/t/buffergeometry-toindexed/1334/17).)

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