@EverthangForeverI was wrong in my above post. :-(
I've downloaded your ElectricAveNew zip and I've been playing with the walkinginspacearot02.png file. Although the file size probably doesn't help, it now appears to be the file pixel dimensions that is the real problem.
I am not sure why. I have used files with much bigger pixel dimensions in other scenes and they haven't been a problem. I can only assume that it is something within the shader itself and the way it renders the deformation of the texture, that is causing a problem with my graphics card for larger images.
I discovered this when I saved the above file as a JPG with same pixel dimensions, instead of PNG*
This kept the same file pixel dimensions but reduced the file size to around 5MB instead of 23MB. The result was that it still stuttered. Having played with different size reductions I have found a 25% reduction in size is about the maximum my graphics card can work with.
Again I have attached a couple of screencaps to show that there does not appear to be a very noticable drop in quality. The first is the original PNG file and the second my reduced size JPG.
Now that I know exactly what the problem is, I can easily re-edit the images so that they work without stuttering. Also I don't need to use the 50% reduction I was using yesterday.
- I know JPG is a lossy format but if there is no transparency in the image, a first generation JPG (from a lossless source such as PNG) on the lowest compression setting does not usually produce that much of a loss in quality. It generally tends to be when you start with a JPG and save a number of times that the lossy bit start to become very apparent. Also my graphics programme has a lossless encoding option for JPG (how that works, I have no idea).