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Scene Color makes point-sampled pixels slightly blurry
I'm working on a game that uses point-sampling for 2D sprites to preserve hard edges. If I try and have a mesh over the game using the Scene Color node (to apply post-effects to the scene behind it), the pixels are slightly blurry and lose their hard-edge nearest-neighbor look. Any ideas? Here's an image showing the simple shader and the (subtle) difference in the look.
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Answer
Not a bug
Freya Holmér (Developer) 10 years ago
It's OpenGL vs DirectX coordinate system discrepancies most likely. DX is Microsoft only (Xbox & Windows)
Actually this doesn't appear to be happening on my Mac. It only happens on my Windows 7 machine.
Under review
That's quite strange. There might be some half-pixel offset issues, but I'm not quire sure. Try using the Scene UVs node and offset the UVs by half a pixel, using the screen parameters node.
Yes, that seems to be correct. Modifying the output by a half-pixel seems to correct it and it's perfectly sharp after that. Here's what I did to modify it, and this fixes it. However, it is interesting that it was already perfect on Mac, but this half-pixel offset is only an issue on Windows.
Answer
Not a bug
It's OpenGL vs DirectX coordinate system discrepancies most likely. DX is Microsoft only (Xbox & Windows)
Also, you can append before the divide and add, making the graph a bit cleaner :)
Ah I see, thanks for the info. Is this an exception I can somehow make on my end, or is this something to be fixed in a future Shader Forge update? Also, thanks for pointing out my shameful rookie mistakes... I'm still new to shader editing. :)
I solved this issue by using the Code node, and essentially adding 0.0 or 0.5 to the pixels offset depending on platform. Hopefully this isn't too expensive:
Actually I just discovered that this pixel offset for Direct3D 11 is the same as OpenGL, so both of those are sharp. However if I adjust for non-OpenGL (as in the example here), then one of the Direct3D's (9 or 11) will be blurry. I can maybe check for each version of Direct3D, but do you think this subpixel offset can be built into shader forge?
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