image caching

CesiumJS
1

I'm displaying multiple images using CZML:

"polygon": {
   "height": polygonHeight,
   "positions":
   {
       "cartographicDegrees": pos
   },
   "material": {
     "image": {
         "image": { "uri": imageUri},
         "color": {
             "rgba": [255, 255, 255, 255]
         }
     }
   }
}

Whenever image is added to the list or removed, the whole CZML object is recreated.
The images are static images.

For performance reasons I would expect Cesium to use browser cache and not download images each time.
Unfortunately this not the case - the request for the images has the following headers set:
Cache-Control:no-cache
Pragma:no-cache

Is it possible to make Cesium to use the cache?

Thank you

2

Cesium does not disable the cache when requesting images.

Are you using the Chrome developer tools? Do you have “Disable cache” checked? I believe when checked, that will add the headers you are seeing to every request.

3

Hello,

I’m a little confused about what you’re asking. How are you adding and removing the images?

I think Cesium does use caching for image materials, but I’m not sure.

Best,

Hannah

4

Scott,

You're right - I had disable cache checked

My bad :slight_smile: