Asking for Jaguar XJ220 intro tech details

[kremiso]

I don't know if this is the correct place to ask, sorry if not

was wondering about the Jaguar XJ220 intro very start, when the big car moves from the right to the left of the screen

a couple of seconds at the beginning of this video :
[ Show youtube player ]

can i ask how you think this short sequence has been implemented?
seems an improvement of the Test Drive II one

i'm not a programmer, i'm just curious about it

[jotd]

I'd say big clipped classical blit. And the mirror effect is using a reversed blit (AFAIK it's possible, else it would be pre-computed to be upside down) with a different palette.

The zoom at the start is much a more interesting effect

[Predseda]

I always adored that huge rolling object, that moves without a hiccup. A bit cheesy is the sound, though. Thundering the gas pedal during this slow constant movement... Tell me how

[roondar]

Originally Posted by Predseda

I always adored that huge rolling object, that moves without a hiccup. A bit cheesy is the sound, though. Thundering the gas pedal during this slow constant movement... Tell me how

Easy, rolling start and careful use of the clutch (wearing it out far quicker than normal)

[Predseda]

I know it is theoretically possible, but still

[rutra80]

Originally Posted by jotd

The zoom at the start is much a more interesting effect

Yeah and most impressive is that it starts immediately after the drive starts - it must be tiny, fits in bootblock or not much bigger.

[kremiso]

Originally Posted by jotd

I'd say big clipped classical blit. And the mirror effect is using a reversed blit (AFAIK it's possible, else it would be pre-computed to be upside down) with a different palette...

Originally Posted by Predseda

I always adored that huge rolling object, that moves without a hiccup...

_/--------\_
|____| , i like it too

i presumed three different objects, the car body plus the two rotating wheels (with the black color used to separate them from the rest?), all mirrored in the under half

[phx]

Originally Posted by jotd

And the mirror effect is using a reversed blit

This is a simple copper list effect, by setting a negative

BPLxMOD

and changing some colours. So less than half of the screen actually needs blitting.

[Predseda]

Originally Posted by phx

This is a simple copper list effect, by setting a negative

BPLxMOD

and changing some colours. So less than half of the screen actually needs blitting.

Isn't Amiga a lovely computer?

[Ray Norrish]

I dunno. If the car is only 8 colours, it can be 1 half of a Dual Playfield, with the logo the other half.
If it is, then it might not even be blitted at all - just modulo shifted.
A quick look at the copperlist/code would confirm?
That's how I'd do it anyway.

[mcgeezer]

i was bored due to having to self isolate.

It's one big blit done in 32 colours.

Copper effect as PHX mentioned.

Edit - actually... 1 big blit and a couple of smaller blits for the turning wheels.

[Galahad/FLT]

Originally Posted by mcgeezer

i was bored due to having to self isolate.

It's one big blit done in 32 colours.

Copper effect as PHX mentioned.

Edit - actually... 1 big blit and a couple of smaller blits for the turning wheels.

Christ, how wasteful, but it works so.

I would have just done a big picture and added to bitplane pointers, blotting anim for wheels.

[mcgeezer]

Originally Posted by Galahad/FLT

Christ, how wasteful, but it works so.

I would have just done a big picture and added to bitplane pointers, blotting anim for wheels.

Yeah, i think the issue is that the car is somewhat over 8 colours so you cant put it into DPM.

[kremiso]

thank you for have looked also into this guys, it was a long time (golden years) question, finally revealed

one day i'll ask you which sequences taken from the old Amiga games do you consider the trickiest to be implemented