# 'updateTextureData' not work when the texture is not link to a material **URL:** \ **Category:** Bugs\ **Tags:** material\ **Created:** [August 25, 2021, 11:21am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341 "2021-08-25T11:21:12Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![wsAndy](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wsandy/32/16904_2.png) [@wsAndy](https://forum.babylonjs.com/u/wsAndy)\ **Post date:** [August 25, 2021, 11:21am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/1 "2021-08-25T11:21:12Z")
hello everyone, I want to update a part of texture and find that ‘engine.updateTextureData()’ is a good choise. However, when the texture is not link to any material, ‘engine.updateTextureData()’ will not work. Here is the PG. [https://playground.babylonjs.com/#EVX1DH#45](https://playground.babylonjs.com/#EVX1DH#45) When I delete line 71, ‘engine.updateTextureData’ will not work. Thanks. ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [August 26, 2021, 11:22am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/2 "2021-08-26T11:22:26Z")
I don’t think this method is really meant to be called by the end user… Anyway, to make it work you must bind the texture first: [https://playground.babylonjs.com/#EVX1DH#55](https://playground.babylonjs.com/#EVX1DH#55) ---
**Author:** ![wsAndy](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wsandy/32/16904_2.png) [@wsAndy](https://forum.babylonjs.com/u/wsAndy)\ **Post date:** [August 26, 2021, 12:58pm UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/3 "2021-08-26T12:58:54Z")
Thanks! ‘engine.\_bindTextureDirectly’ is necessary ---
**Author:** ![wsAndy](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wsandy/32/16904_2.png) [@wsAndy](https://forum.babylonjs.com/u/wsAndy)\ **Post date:** [August 27, 2021, 6:12am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/4 "2021-08-27T06:12:27Z")
I find a new problem here, in PG( [https://playground.babylonjs.com/#EVX1DH#60](https://playground.babylonjs.com/#EVX1DH#60) ), I could update three part of image . but in PG( [https://playground.babylonjs.com/#EVX1DH#62](https://playground.babylonjs.com/#EVX1DH#62) ), only one part region could be updated. it’s realy strange ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [August 27, 2021, 9:25am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/5 "2021-08-27T09:25:04Z")
You have some errors in the console log in the 2nd PG: ```auto babylon.js:16 WebGL: INVALID_OPERATION: texSubImage2D: ArrayBufferView not big enough for request ``` That’s because the subarray you extract is not big enough given the width/height of the texture you want to update (`region.width * 0.5` and `region.height * 0.5`). ---
**Author:** ![wsAndy](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wsandy/32/16904_2.png) [@wsAndy](https://forum.babylonjs.com/u/wsAndy)\ **Post date:** [August 30, 2021, 3:47am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/6 "2021-08-30T03:47:16Z")
[https://playground.babylonjs.com/#EVX1DH#63](https://playground.babylonjs.com/#EVX1DH#63) Sorry, I don’t understand. the subarray return an array with 37500 length, and the texture I want to update is 250x150. why this array is not big enough? ---
**Author:** ![wsAndy](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/wsandy/32/16904_2.png) [@wsAndy](https://forum.babylonjs.com/u/wsAndy)\ **Post date:** [August 30, 2021, 4:02am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/7 "2021-08-30T04:02:46Z")
I find the reason. [Here](https://stackoverflow.com/questions/42789896/webgl-error-arraybuffer-not-big-enough-for-request-in-case-of-gl-luminance) The width or height cannot divide by 4, I need add **gl.pixelStorei(gl.UNPACK\_ALIGNMENT, 1);** ---
**Author:** ![Evgeni\_Popov](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/evgeni_popov/32/4432_2.png) [@Evgeni\_Popov](https://forum.babylonjs.com/u/Evgeni_Popov)\ **Post date:** [August 30, 2021, 9:01am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/8 "2021-08-30T09:01:59Z")
I don’t know how to handle this one as I don’t know much of openGL… After having read some docs, I think we could set the UNPACK\_ALIGMENT to 1 in the whole engine as I think our buffers are always tightly packed (we only set it to 1 in the raw texture class when width can’t be divided by 4, and we don’t reset it to 4 afterward, meaning it stays to 1). But it’s not what we are doing, so I prefer @sebavan having a look at that. As a quick fix, you can call `pixelStorei` yourself: [https://playground.babylonjs.com/#EVX1DH#64](https://playground.babylonjs.com/#EVX1DH#64) ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [August 30, 2021, 10:46am UTC](https://forum.babylonjs.com/t/updatetexturedata-not-work-when-the-texture-is-not-link-to-a-material/23341/9 "2021-08-30T10:46:44Z")
@Evgeni_Popov I agree we should be able to set it to 1 on start ??? what do you think