I noticed the perspective shader could use some improvement - maybe another version. It's most obvious when you try to distort a circle - see the examples. It would be nice if we could get a perspective shader that would distort that circle correctly. It should be more oval, not as pear shaped.
Also, how difficult would it be to make one that allows you to set the position of all 4 corners?
I tend to just use the lens shader with a gradient as the texture. Though, to be fair, I haven't tried it on a circle.
The lens shader has the same issue unfortunately.
Impossible.Also, how difficult would it be to make one that allows you to set the position of all 4 corners?
This is as close as you're going to get:
http://community.clickteam.com/threads/92958-Convex-Quadrilateral-pixel-shader
...but it still uses an affine transformation (rather than a perspective transformation, which is not possible within a shader), so you'll still have the same distortion. It's also right at the limit of what is possible in an MMF2/CF2.5 shader, so I will not be modifying it any further.
I see. Thanks for the explanation. I wasn't sure what the limitations were.
Haha, back then I thought your shader does a perspective transformation! That's what I tried to implement back then, and failed. It's too bad we don't have such a shader. But this one guy made a vertex shader - I figure it might be possible, but hacky.
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