Hey guys, just wanted to share a little update with everyone on some research I've been doing. I created a SceneViewExtension based tone mapper / post process pipeline without using the mobile HDR flag. This was a lot simpler than I thought it would be. This uses the render dependency graph and you could use it without the meta engine branch. I'll post more about it later. This is similar to the vulkan subpass version that Meta has in the engine fork, but this one is not a subpass. So, you could do effects that check neighboring pixels and additional shader stuff.
