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I'm rendering a scene using scanline method. In order to get rid of aliasing we need to render a scene with higher resolution (2x, for example). I'm trying to figure out how to calculate the color of a sample when it is not taken from the center of the subpixel. For example, we have 4 subpixels per 1 pixel, where the blue circle is the center of the subpixel, and the red circle is the sample position.

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I tried to find information about sample calculation, but got nothing. I assume that I need to calculate sample color using 4 neighboring subpixels and apply bilinear interpolation to them to find the color.

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Is my guess true, or does it have to somehow calculate the color of the sample in a different way?

Paviel Kraskoŭski
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  • What are the samples and subpixels in this context? Are you ray-tracing, sampling a texture, or something else entirely? – Dan Hulme Sep 20 '18 at 19:39
  • @DanHulme I'm rendering a scene using scanline method. In order to get rid of aliasing we need to render a scene with higher resolution (2x, for example). After that we have 4 subpixels per 1 pixel. As I know, the easiest way to downsample a frame is to calculate the average color of all subpixels (regular grid algorithm?). But I can't figure out how to calculate the color of a sample which is not positioned in the center of subpixel. I think that it's calculated using 4 neighbouring subpixels,but I'm not sure. – Paviel Kraskoŭski Sep 20 '18 at 20:02
  • @PaviełKraskoŭski i need any tutorial to understand this problem – information Sep 23 '18 at 23:29
  • @x-rw Here you can read about supersampling at the beginning of the article before "SUPERSAMPLING EVOLVES INTO MSAA". Wikipedia. Link on the Wikipedia page to the reference article. – Paviel Kraskoŭski Sep 25 '18 at 09:27

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