RuntimeError: Vertex shader failed to compile error in iOS

CesiumJS
1

I am getting a RuntimeError: Vertex shader failed to compile in iOS.

This does not occur in desktop browsers.

The app in question can be found in: http://mgiraldo.github.io/pic/

The error log starts with:

[Cesium WebGL] Vertex shader compile log: ERROR: 0:7: ‘’ : wrong operand types no operation '’ exists that takes a left-hand operand of type ‘uniform lowp samplerCube’ and a right operand of type ‘highp 4-component vector of float’ (or there is no acceptable conversion)
ERROR: 0:7: ‘assign’ : cannot convert from ‘uniform lowp samplerCube’ to ‘Position highp 4-component vector of float’

``

Any idea why this is happening?

2

iOS 9

navigator.appVersion: “5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Safari/601.1.42”

3

This is a bug in Safari. See this thread for details: https://groups.google.com/d/msg/cesium-dev/KVS97hZLXIY/sScWEzHcAAAJ

4

similar BUG in Jan 2023 -
Win 11 x64, last Chrome v110 , ASUS ROG STRIX 9750H 16Gb RTX2070

Cesium.js:50 [Cesium WebGL] Vertex shader compile log: ERROR: 0:15: ‘a_normal’ : undeclared identifier
ERROR: 0:15: ‘normalize’ : no matching overloaded function found
ERROR: 0:15: ‘=’ : dimension mismatch
ERROR: 0:15: ‘=’ : cannot convert from ‘const mediump float’ to ‘highp 3-component vector of float’

BUT in my Macbook M1 today last Chrome v110 all good work. Also all good work severals day ago & last 2 years )

Im simply load 3D models without ANY my shaders

image

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image801×365 21 KB

5

Hi @dihand,

In the January release, we included moving to WebGL 2 by default, which requires an update of any custom shader code. If you are still having trouble, I would suggest opening a new thread and including a Sandcastle example which replicates the issue.

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