You are not logged in.


Monday, May 9th 2016, 2:49pm

WebGL issues

Hi !

I have two separate issues with the WebGL viewer that I use as a fallback to the Flash viewer.

First, and that's the reason why I use it as a fallback and not as a preferred viewer, the memory usage is huge. Firefox can use as much as 2GB of ram (and even crash) when loading a single panoramic image and quickly moving around. Also, it seems that the memory is not released upon destruction of the viewer, I have to wait for the garbage collector to do it's work.
Is this normal behaviour for the WebGL viewer ? The Flash viewer does not even use a quarter of that memory amount.

Second, it seems that the viewer does not work in IE11. I don't know what could be wrong since it works in Firefox. I can't see any error in IE's console (but IE's console is crap, so...).
I have read some posts about NPOT textures, but my panoramic images are cubic with a tilesize of 1024 and levelsize of 4096, so everything should be "power of two", right ?

Thanks for your help !


Tuesday, May 10th 2016, 2:10pm


it depends on the browser itself when it will really release the memory - from krpano side not used memory is not referenced anymore and available for freeing by the browsers GC.

But that can be also a bug in the browser or in the GPU drivers.

About IE11 - normally it should work fine, also with NPOT textures.

Btw - a tilesize of 1024px is not optimal for several reasons (e.g. GPU texture upload time and more inefficient memory management). I would recommend using 512px.

Best regards,


Tuesday, May 31st 2016, 9:24am

Thanks Klaus, and sorry for the late answer.
I'll test with 512px texture size.
About the memory problem, I think it is browser related, Chrome behaves better than Firefox here.
Anyway, we chose to prefer Flash and use WebGL as a fallback, even though I would prefer to do it the other way round.