# Error when reading DepthTexture of RenderTargetTexture **URL:** \ **Category:** Questions\ **Created:** [April 15, 2021, 1:53pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021 "2021-04-15T13:53:20Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Luck\_Good](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/luck_good/32/8286_2.png) [@Luck\_Good](https://forum.babylonjs.com/u/Luck_Good)\ **Post date:** [April 15, 2021, 1:53pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/1 "2021-04-15T13:53:20Z")
[https://www.babylonjs-playground.com/#TV5FSK](https://www.babylonjs-playground.com/#TV5FSK) [.WebGL-00004DFC00141C00] GL\_INVALID\_OPERATION: Mismatch between texture format and sampler type (signed/unsigned/float/shadow). ---
**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:** [April 15, 2021, 2:37pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/2 "2021-04-15T14:37:41Z")
Bringing up the latest from the thread on github: In your case you are creating a comparison sampler or shadow sampler but use it as a depth sampler: > **[Babylon.js Playground](https://www.babylonjs-playground.com/#TV5FSK%232)** > > Babylon.js playground is a live editor for Babylon.js WebGL and WebGPU 3D scenes [![@sebavan](https://avatars.githubusercontent.com/u/16655165?s=60&u=03f7b2a2237fe86236a9b0244a182af2c1032da0&v=4)](https://github.com/sebavan) [sebavan](https://github.com/sebavan) closed this [19 minutes ago](https://github.com/BabylonJS/Babylon.js/issues/10197#event-4599613270) [![@GoodLuckIce](https://avatars.githubusercontent.com/u/9364696?s=88&u=2558892e055391e01aac1ea8f1dc882f16c5142e&v=4)](https://github.com/GoodLuckIce) Author ### **[GoodLuckIce](https://github.com/GoodLuckIce)** commented [39 seconds ago](https://github.com/BabylonJS/Babylon.js/issues/10197#issuecomment-820474641) thank you very much. But I actually want to get the correct depth value, but the obtained depth value is equal > **[Babylon.js Playground](https://www.babylonjs-playground.com/#TV5FSK%233)** > > Babylon.js playground is a live editor for Babylon.js WebGL and WebGPU 3D scenes I need to use depth to determine the final result of the two rendering results, but the value of depth is equal, which is an error. ---
**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:** [April 15, 2021, 2:38pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/3 "2021-04-15T14:38:52Z")
@Luck_Good I am not sure to understand what you are trying to do here. Could you detail a bit more your use case ? ---
**Author:** ![Luck\_Good](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/luck_good/32/8286_2.png) [@Luck\_Good](https://forum.babylonjs.com/u/Luck_Good)\ **Post date:** [April 15, 2021, 3:02pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/4 "2021-04-15T15:02:56Z")
@sebavan I have different types of models that require different rendering modes to render. Then I merge the final results together. such as: Use forge ([Forge | RCDB](https://forge-rcdb.autodesk.io/configurator?id=58cac141597e53832268b88e)) The rendering mode of the engine renders the BIM model Use Cesium ([Cesium Demo](https://sandcastle.cesium.com/gallery/3D%20Tiles%20Photogrammetry.html)) The rendering mode of the engine renders the 3dTiles model. Combine the final rendering results together. I am going to try to implement these rendering modes in babylonjs. Unfortunately, when I first started to implement this idea, I ran into the problem of ==\> depth acquisition error I really hope to get help to keep me going. [https://www.babylonjs-playground.com/#TV5FSK#3](https://www.babylonjs-playground.com/#TV5FSK#3) ---
**Author:** ![Luck\_Good](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/luck_good/32/8286_2.png) [@Luck\_Good](https://forum.babylonjs.com/u/Luck_Good)\ **Post date:** [April 15, 2021, 3:53pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/6 "2021-04-15T15:53:53Z")
Is this an engine bug? @sebavan ---
**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:** [April 15, 2021, 3:55pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/7 "2021-04-15T15:55:32Z")
It has only been 1 hour since your message, and I think it is mostly a setup error here. You need to let time to the community to answer. I bet you ll have one by tomorrow. ---
**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:** [April 15, 2021, 6:26pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/8 "2021-04-15T18:26:01Z")
It looks like an angle issue as comparison samplers are fine: [https://www.babylonjs-playground.com/#TV5FSK#14](https://www.babylonjs-playground.com/#TV5FSK#14) But not in read mode: [https://www.babylonjs-playground.com/#TV5FSK#11](https://www.babylonjs-playground.com/#TV5FSK#11) You should try to create a chromium issue for it ? ---
**Author:** ![Luck\_Good](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/luck_good/32/8286_2.png) [@Luck\_Good](https://forum.babylonjs.com/u/Luck_Good)\ **Post date:** [April 16, 2021, 2:04am UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/9 "2021-04-16T02:04:52Z")
> > > https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettex…ture/20021 > > https://www.babylonjs-playground.com/#TV5FSK#11 > > I have the same error in edge chrome firefox browser ---
**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:** [April 16, 2021, 11:42am UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/10 "2021-04-16T11:42:14Z")
It is a setup issue in your PG as you are setting the depth texture in linear and only nearest is allowed. We added a guard in engine for that. ---
**Author:** ![Luck\_Good](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/luck_good/32/8286_2.png) [@Luck\_Good](https://forum.babylonjs.com/u/Luck_Good)\ **Post date:** [April 16, 2021, 12:21pm UTC](https://forum.babylonjs.com/t/error-when-reading-depthtexture-of-rendertargettexture/20021/11 "2021-04-16T12:21:12Z")
Thank you very much, I have learned the correct setting method [https://www.babylonjs-playground.com/#TV5FSK#16](https://www.babylonjs-playground.com/#TV5FSK#16)