32 replies to this topic

[grafixbmp]

With the scrolling circles, what if they were expanded to 2x sprites and then there would be more implied resolution when it is skewed by down to single color clocks for more detailed circles.

And I know you would have your own way of coding the system, but this is sorta what I thought about before
Perhaps a lookup table listing out the smooth skewing say to the 4th-8th scanline. then this way there could be multiple stacked skewed linear vectors that can flex as if they were strait lines when you race through the track. Like only the patterns that give an evenly distributed skewed strait line. Then as a section drops down the screen, the skew vector could be changed and therefore animate/flex across the screen, implying 2D flat terain viewed from a 3D perspective.

[roland p]

(I'm in a hurry right now)
I've now tried to scale the circles progressively by removing a single line each time the circle shrinks. This is done at a variable frequency. As an alternative, I could flicker between two versions of the circle. (like when it goes up, from a 11 line height circle to a 10 line height circle, I could flicker between them. 'Flicker' does sound bad, but it this case it does look really good you are in motion.

Attached Files

•  scaling_circles2.bin   4K   38 downloads

[R.O.T.S]

roland p, on Thu Sep 8, 2011 1:21 AM, said:

grafixbmp, on Fri Sep 2, 2011 2:45 PM, said:

besides, that's like saying pole position didn't need the red/white road boarders either.

This is some pseudo-3d with 90 degrees turns:

I remember Cisco Heat,it does not start to badly but after a minute or so it feels like your driving along a road through an earth quake with the distant buildings and trees swaying left-right.I cannot see how it could be done without just 2 frames flickering faster or slower.

Edited by R.O.T.S, Sat Sep 17, 2011 2:38 AM.

[roland p]

I now have some two-tone roads. It would be nice to put circles in it in inverted colors....
Up/down for speed.

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•  two-tone-road.bin   4K   34 downloads

[grafixbmp]

Every test here shows that it can be faked so well that racing games (and such) could not only be 2 player with this perspective but could play smoother than most racing games thus far. Excellent work. I take it the PF pixels aren't even being used?

[roland p]

grafixbmp, on Tue Sep 20, 2011 12:48 AM, said:

Every test here shows that it can be faked so well that racing games (and such) could not only be 2 player with this perspective but could play smoother than most racing games thus far. Excellent work. I take it the PF pixels aren't even being used?

Thanks!

The routine could also be used to create good looking curvestones.

The PF pixels aren't used yet. Those are always a bit hard, especially the assymetrical ones. But for example, the first kernel I posted with only horizontal lines, could be modified so it displays horizontal lines + playfield pixels within that line. That way it doesn't have to update the pf pixels all the time.

Right now the road is drawn by 10 kernels so it is really straightforward:

 LDX LINE0
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_0
 STA WSYNC
 DEX
 BPL LOOP_LINE_0
 
 
 
 LDX LINE1
 LDA COLOR_B
 STA COLUBK
LOOP_LINE_1
 STA WSYNC
 DEX
 BPL LOOP_LINE_1
 
 LDX LINE2
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_2
 STA WSYNC
 DEX
 BPL LOOP_LINE_2
 
 LDX LINE3
 LDA COLOR_B
 STA COLUBK
LOOP_LINE_3
 STA WSYNC
 DEX
 BPL LOOP_LINE_3
 
 
 LDX LINE4
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_4
 STA WSYNC
 DEX
 BPL LOOP_LINE_4
 
 LDX LINE5
 LDA COLOR_B
 STA COLUBK
LOOP_LINE_5
 STA WSYNC
 DEX
 BPL LOOP_LINE_5
 
 LDX LINE6
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_6
 STA WSYNC
 DEX
 BPL LOOP_LINE_6
 
 LDX LINE7
 LDA COLOR_B
 STA COLUBK
LOOP_LINE_7
 STA WSYNC
 DEX
 BPL LOOP_LINE_7
 
 LDX LINE8
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_8
 STA WSYNC
 DEX
 BPL LOOP_LINE_8
 
 LDY LINE9
 LDA COLOR_B
 STA COLUBK
LOOP_LINE_9
 STA WSYNC
 DEY
 BPL LOOP_LINE_9
 
 LDY LINE10
 LDA COLOR_A
 STA COLUBK
LOOP_LINE_10
 STA WSYNC
 DEY
 BPL LOOP_LINE_10

Edited by roland p, Tue Sep 20, 2011 1:43 AM.

[roland p]

Last tech-demo, now you can move left/right too and see magic happening

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Attached Files

•  scaling_and_skewing.bin   4K   59 downloads

[grafixbmp]

that last one was the highlight of my day. I ran it and played with it for about 10 min. I was fiddlin with how atari skewing works today before I even saw your post. I bet there are several people wouldn't be able to beileve this was running on an atari. It just looks that good.