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Cart [#22059#] | Code | 2016-06-01 | License: CC4-BY-NC-SA | Embed

Dunno what causes this weird effect to happen.
Wait about half a minute or so and look at the plane and watch the wall background closely and how things move.

Note that I didn't employ any parallaxing and the only sprites are the plane and the shadows. Yet, at times, especially when it speeds up, things in the background (floor/wall and table/images) seems to be moving at different speeds and sometimes even in different directions. Weird optical illusion/bug in p8. Or I may just be tired and seeing things.

P#22060 2016-06-01 18:52 ( Edited 2016-06-03 01:45)

Yeah, I'm seeing that too :o

P#22061 2016-06-01 18:59 ( Edited 2016-06-01 22:59)

So yeah. There's certain effect I had not mentioned (look at the table) to check for me just suggesting other people. If anyone sees it too (happens few minutes after this was running), I'll be 100% sure it's not just me suggesting other people.

Anyway, I suspect (if it really happen) either of the following:

  • Optical illusion. Which one, I am not sure (if I'm lucky and it's a new one I reserve the name "Scandalous Fake Parallax Illusion")
  • Bug in Pico that makes it not render stuff correctly.

You can inspect cart's code to see that no parallax is going on and background is 100% static (like in most NES games).

P#22063 2016-06-01 19:10 ( Edited 2016-06-01 23:11)
:: scgrn
P#22065 2016-06-01 19:39 ( Edited 2016-06-01 23:41)

Nothing too complex. If you have a pattern that repeats every 8 pixels, and it's also "moving" 8 pixels every frame, it will look like it's being drawn in the exact same position/not moving. Tweak the speed a little up or down, and it will appear to be moving right or left by a pixel each frame.

The background elements have patterns in them with differing repeat periods, so they appear to move at different rates. If their periods have a common multiple, there will be times that their apparent motion will line up.

P#22066 2016-06-01 20:01 ( Edited 2016-06-02 00:01)

Either way, I intend to keep this effect in. Just wanted to share it and see if anyone else sees this as well.

P#22069 2016-06-01 20:43 ( Edited 2016-06-02 00:43)

Darkhog, I am liking the paper airplane sim. It brings back some great old memories.

P#22137 2016-06-02 21:45 ( Edited 2016-06-03 01:45)

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