# When merging boxBufferGeometry with BufferGeometry getting null value

**URL:** <https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608>\
**Category:** Questions\
**Tags:** geometry\
**Created:** [December 15, 2020, 8:05am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608 "2020-12-15T08:05:41Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Alex](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/alex/32/9027_2.png) [@Alex](https://discourse.threejs.org/u/Alex)\
**Post date:** [December 15, 2020, 8:05am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608/1 "2020-12-15T08:05:41Z")

</div>

Hello All,

I am using BufferGeometryUtils to merge the buffer geometries but i am getting null

BufferGeometryUtils.mergeBufferGeometries( geometries )

Here geometries contain an array

> Blockquote  
> [  
> {  
> “metadata”: {  
> “version”: 4.5,  
> “type”: “BufferGeometry”,  
> “generator”: “BufferGeometry.toJSON”  
> },  
> “uuid”: “55C9405E-968A-4F91-A76B-985C5E69BF62”,  
> “type”: “BufferGeometry”,  
> “data”: {  
> “attributes”: {  
> “position”: {  
> “itemSize”: 3,  
> “type”: “Float32Array”,  
> “array”: [  
> 0,  
> 12,  
> 0,  
> 64.80000305175781,  
> 12,  
> 0,  
> 64.80000305175781,  
> 12,  
> -39.16999816894531,  
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> 0,  
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> 0,  
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> -147.50999450683594,  
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> 12,  
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> 65.80000305175781,  
> 12,  
> -216.67999267578125,  
> 65.80000305175781,  
> 12,  
> -270.8500061035156,  
> 130.60000610351562,  
> 12,  
> -270.8500061035156,  
> 130.60000610351562,  
> 12,  
> -310.0199890136719,  
> 130.60000610351562,  
> 12,  
> -310.0199890136719,  
> 65.80000305175781,  
> 12,  
> -310.0199890136719,  
> 65.80000305175781,  
> 12,  
> -270.8500061035156,  
> 65.80000305175781,  
> 12,  
> -325.0199890136719,  
> 130.60000610351562,  
> 12,  
> -325.0199890136719,  
> 130.60000610351562,  
> 12,  
> -364.19000244140625,  
> 130.60000610351562,  
> 12,  
> -364.19000244140625,  
> 65.80000305175781,  
> 12,  
> -364.19000244140625,  
> 65.80000305175781,  
> 12,  
> -325.0199890136719,  
> 65.80000305175781,  
> 12,  
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> 12,  
> -379.19000244140625,  
> 130.60000610351562,  
> 12,  
> -418.3599853515625,  
> 130.60000610351562,  
> 12,  
> -418.3599853515625,  
> 65.80000305175781,  
> 12,  
> -418.3599853515625,  
> 65.80000305175781,  
> 12,  
> -379.19000244140625,  
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> 12,  
> -433.3599853515625,  
> 130.60000610351562,  
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> 130.60000610351562,  
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> 12,  
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> 12,  
> -704.2100219726562,  
> 130.60000610351562,  
> 12,  
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> 12,  
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> 130.60000610351562,  
> 12,  
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> 65.80000305175781,  
> 12,  
> -743.3800048828125,  
> 65.80000305175781,  
> 12,  
> -704.2100219726562  
> ],  
> “normalized”: false  
> }  
> }  
> }  
> },  
> {  
> “metadata”: {  
> “version”: 4.5,  
> “type”: “BufferGeometry”,  
> “generator”: “BufferGeometry.toJSON”  
> },  
> “uuid”: “EE6E26A5-CD7A-4174-92A5-7E780D9AE80A”,  
> “type”: “BoxBufferGeometry”,  
> “width”: 5,  
> “height”: 24,  
> “depth”: 5  
> }  
> ]

Please let me know whats wrong here

---

<div class="post-metadata">

**Author:** ![prisoner849](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/prisoner849/32/535_2.png) [@prisoner849](https://discourse.threejs.org/u/prisoner849)\
**Post date:** [December 15, 2020, 8:25am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608/2 "2020-12-15T08:25:07Z")

</div>

The docs say:  
_Merges a set of geometries into a single instance. All geometries must have compatible attributes. If merge does not succeed, the method returns null._

All merging geometries have to have the same set of attributes and have to be all indexed or all non-indexed. You can’t merge indexed and non-indexed geometries.

---

<div class="post-metadata">

**Author:** ![Alex](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/alex/32/9027_2.png) [@Alex](https://discourse.threejs.org/u/Alex)\
**Post date:** [December 15, 2020, 8:31am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608/3 "2020-12-15T08:31:43Z")

</div>

So here boxBuffer is an non indexed geometry is there an conversion possible to make them compatible.

I think this is usefull

> **[Fyrestar/THREE.BufferGeometry-toIndexed](https://github.com/Fyrestar/THREE.BufferGeometry-toIndexed)**
>
> Creating a indexed BufferGeometry from a non-indexed.

  
but how to do this

---

<div class="post-metadata">

**Author:** ![prisoner849](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/prisoner849/32/535_2.png) [@prisoner849](https://discourse.threejs.org/u/prisoner849)\
**Post date:** [December 15, 2020, 8:34am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608/4 "2020-12-15T08:34:22Z")

</div>

Looks like your BufferGeometry is non-indexed.  
So you can call `.toNonIndexed()` on BoxBufferGeometry (as that geometry is an indexed one).

---

<div class="post-metadata">

**Author:** ![Alex](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/alex/32/9027_2.png) [@Alex](https://discourse.threejs.org/u/Alex)\
**Post date:** [December 15, 2020, 8:39am UTC](https://discourse.threejs.org/t/when-merging-boxbuffergeometry-with-buffergeometry-getting-null-value/21608/5 "2020-12-15T08:39:40Z")

</div>

No same issue , i tried vise versa too.

And i have the position vector for each geometry i am using it like this

box1.position.copy(position)

box2.position.copy(position)

const mesh = new THREE.Mesh(BufferGeometryUtils.mergeBufferGeometries( [box1.geometry, box2.geometry]), material)

but both the boxes come together

Please can you help me with this position first so i can quickly share a pen for a better help

Thanks