Created attachment 8552732 [details] alphacontext.jpg User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0 Build ID: 20150108202552 Steps to reproduce: 1. Create WebGL context with alpha:false argument. 2. Create an RGBA texture and a framebuffer. 3. Render something into the texture writing to both color and alpha. 4. Read the texture. Actual results: Alpha channel is not written. Expected results: Both color and alpha must be written. Context argument should only affect main framebuffer blending with the page. Test page: http://geom.io/pc33/testAlphaWrite.html You should see 2 gradients (left is read from RGB, right is from A). Works fine on Chrome/IE and even on Firefox 33.1.1, but broken in new (35).
Confirmed, see Blend4Web Cartoon Interior demo: https://www.blend4web.com/tutorials/examples/cartoon_interior/cartoon_interior.html
Update: Cartoon Interiod demo has been already fixed (alpha:true workaround), check demos from bug 1124187
Sounds like your bug Jeff.
This issue badly breaks Cesium (http://cesiumjs.org/) as well. Compare any of our demos against Chrome or IE and you'll see that anything with translucency ends up either having a solid color or turns white. For example: http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Geometry%20and%20Appearances.html&label=Showcases What are the changes that this gets fixed and pushed out with a 35.02 update?