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ready.
Registered: Feb 2003
Posts: 441 |
Flimbo's Quest scrolling routine
I was looking for some documents explaing how to do the scrolling effect like in Flimbo's Quest, where there are 2 levels of scrolling moving at different speeds, one level behind the other one. Anyone can help me? Thanks. |
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Scout
Registered: Dec 2002
Posts: 1570 |
If I recall correctly, the "scrolling effect" is called Parallax Scrolling.
The hardcore coders here can (hopefully) explain how to do this (charset trickery?).
R. |
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Ben
Account closed
Registered: Feb 2003
Posts: 163 |
Correct. Indeed char trickery. Although the background chars scroll along (d016), you can animate the chars to do differently. That is pretty much it. |
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Oswald
Registered: Apr 2002
Posts: 5094 |
lets say chars $00-7f are to build up the upper layer, chars 80-ff for the background layer. You store the charset 4 times, where the 2nd half of chars are "animated", in other words shifted in a direction more and more.
now you do your general scrolling with d016 while you animate the background layer's chars to move to the opposite direction, which gives the vision they move slower. Now you can build up the screen from chars and distuingish between layers by checking the chars upmost bit bpl/bmi. |
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ready.
Registered: Feb 2003
Posts: 441 |
Ok, I've got the main point, thanx. But still I don't understand what happens when the upper layer overlaps with the lower layer, which is then hidden underneath. I would do an AND between the two chars overlapping, but it would take too much time.... |
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QuasaR
Registered: Dec 2001
Posts: 145 |
Just checked Flimbo's Quest out: If you look closely you'll see that the upperlayer chars are always 4 multipixel wide so there's no "overlapping" with the background in one char. It would be indeed too slow, to and/or the upper and background layer. |
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QuasaR
Registered: Dec 2001
Posts: 145 |
Ah, forgot something (damn Alzheimer...). Sometime ago, in the glory times of the german mag "64'er" they released a tool to edit such paralax chars: http://noname.c64.org/csdb/release/?id=15424. I think the game GENLOCK was made with this tool. |
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Oswald
Registered: Apr 2002
Posts: 5094 |
overlapping is character based... thats all. no ORA or AND or whatever, a char on the upper layer always hides the whole char behind it. |
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AmiDog
Registered: Mar 2003
Posts: 97 |
Read about Flimbo's scrolling here:
http://www.lemon64.com/forum/viewtopic.php?t=2922 |
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Wile Coyote
Account closed
Registered: Mar 2004
Posts: 646 |
Wasn't the game Paralex (Paralex?) the first game to show the effect in a commercial game. They only used 4 char definitions for the effect, which as impressive as say, Hawk Eye |
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Wile Coyote
Account closed
Registered: Mar 2004
Posts: 646 |
which was not quite as impressive as say, Hawk Eye :) |
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