Texture display wrong in IOS browsers

[ehipasika]

I found in ScupltGL can not display correctly in all IOS browers, but IOS claims it support WEBGL, and i test another webgl matcap sample base on matcap, and it's work fine.
pls check this link for test video:
https://vimeo.com/185645917

[stephomi]

Thanks for the report, unfortunately I have an android,, so for now I can't really debug it.

[as02700]

something wrong with me too.
when i // if (this._showGrid) this._grid.render(this)
the texture can not display correctly( look like color lump / color spot ).
the video : https://youtu.be/YX-jsQu-4gI

my env is iphone5( IOS8.3 )

[KiaraGrouwstra]

This commit appeared to have broken the shader on some iOS environments.

[stephomi]

Thanks, I suspect something wrong with shader derivatives, can you try https://goo.gl/m9C6Bx and see if it works?

[as02700]

yes, it work in my iphone5( IOS8.3 ) ( https://goo.gl/m9C6Bx ). seen like as desktop

[ehipasika]

Yes, it works fine in IOS10 Chrome. So if it means your suspect not established?
In my further test for SculptGL shader in IOS10 Chrome, I found PBR,matcap,normal shader are also not work well, but UV shader is OK.
So I guess the bug is from Reflection/Environment Mapping, pls check Jaume Sanchez's blog about Spherical reflection (or environment) mapping (SEM)
https://www.clicktorelease.com/blog/creating-spherical-environment-mapping-shader
Someone also report a bug in IOS8, and they solve the problem, but Jaume Sanchez's tutorial is base on three.js framework, I don't know if it work in native webgl.
Someone also report a bug in IOS8, and the solve the problem, but Jaume Sanchez's tutorial is base on three.js framework, I don't know if it work in native webgl.

[stephomi]

I'm almost sure it's not the matcap shader as PBR and normal have the issue too.
It can be many things, but until I debug on an iOS for real, it's tricky to solve :p.

[as02700]

i came to ( https://www.browserstack.com/ ) test on IOS online within a free account.
it can test on locale need a plugin

i think it can help you

[stephomi]

Ok I'll see if I can reproduce and if it's not too complex to setup!

[selfsame]

I believe this was fixed with 8414c65