Line scrolling

[Boyfinn]

Im trying to achieve a repeating and scrolling ground that uses rasterization for perspective like in street figter 2

the same effect can be seen in the first level of "The Adventures of Batman & Robin"
https://youtu.be/zz4eQygXpRY?t=1m39s

What would be the most efficient way to approach this? Does anyone have any snippets or examples of how this could be done?
Thanks.

[Miquel]

My best guess is this is doing using horizontal scroll per line. Very much like full plane scroll, you apply to every line the same value except the ones which are doing this effect which have higher rations of scroll as they are close to the viewers eye.

Perhaps someone can tell more details.

[KanedaFr]

Some details are available on the infamous Lou's Pseudo 3D page

[Boyfinn]

I found

Code: Select all

VDP_setHorizontalScrollLine

in the documentation.
Does this work the same way?

[Stef]

That is indeed the method to use to apply the horizontal line scrolling allowing that effect

[Boyfinn]

any examples how this could be implemented with that method?

[Boyfinn]

Okay i got i somewhat working, however im getting some lines that move and some that dont and they look overlapped&garbled

[Boyfinn]

Would anyone here have some example code of how to use VDP_linescroll properly?
EDIT: i got the scroll lines working properly, but now when i'm trying to do vertical tile scrolling using the same method, all the tiles scroll the same amount for some strange reason.

[Stef]

You need to define the scroll mode to vertical tile first.

[Boyfinn]

I see, it first didnt work, but then i looked through the docs and found out that the vertical tile scrolling mode is called VSCROLL_2TILE and not just VSCROLL_TILE