Examples of texture mapped vectors on A500?

koobo · 28 April 2021, 17:55

Just happened to watch [ Show youtube player ], since I wanted to listen to the music. The music is most excellent, but I didn't remember the demo had such impressive texture mapped vector looking things.

How did the coder SIM implement those? What other demos or games did similar things?

DanScott · 28 April 2021, 19:01

I've never disassembled this to look, but I always had the feeling that he converted images into a format where he could just draw lines with the blitter and fill in 1 pass.

Jobbo · 28 April 2021, 19:26

There's a lot going on there!

The shapes don't seem to do the usual triangle warping so it doesn't seem to be linear interpolation and there are scenes with generic overdraw.

I would guess it's an early c2p, would be really interested to know for sure.

Maybe the coder took a look at the Dpaint plane code and made their own optimized version.

Antiriad_UK · 28 April 2021, 20:33

I always really liked that demo and the music change to the running man bit. But damnnnnn that BBS phone number section is tortuous now

chb · 28 April 2021, 20:41

Quote:

Originally Posted by DanScott

I've never disassembled this to look, but I always had the feeling that he converted images into a format where he could just draw lines with the blitter and fill in 1 pass.

AFAIK it's something like this, the programmer wrote an article* about that technique in a German Amiga mag ('Amiga Magazin' IIRC).
It was definitely blitter-fill based, without c2p, but I do not remember the details. IIRC it didn't draw every pixel independently, but merged areas of the same color to a bigger shape.

*rather a series of articles about advanced game programming techniques - first few were about voxels on the A500. Unfortunately SIM didn't finish the series.

koobo · 29 April 2021, 09:55

Quote:

Originally Posted by chb

AFAIK it's something like this, the programmer wrote an article* about that technique in a German Amiga mag ('Amiga Magazin' IIRC).
It was definitely blitter-fill based, without c2p, but I do not remember the details. IIRC it didn't draw every pixel independently, but merged areas of the same color to a bigger shape.

*rather a series of articles about advanced game programming techniques - first few were about voxels on the A500. Unfortunately SIM didn't finish the series.

This is probably the definitive answer then, thanks

Would be cool to read these articles (or at least try, since my German is quite bad).

morbid · 29 April 2021, 09:56

I have always liked the vectors in this one:
https://www.pouet.net/prod.php?which=19102

koobo · 29 April 2021, 10:26

Quote:

Originally Posted by morbid

I have always liked the vectors in this one:
https://www.pouet.net/prod.php?which=19102

Haven't seen that one before! The ham part gave me a chuckle

There's also an explanation from the original author of the effect

cv643d · 29 April 2021, 22:45

I think he is a member here?

28 April 2021, 17:55	#1
koobo Registered User Join Date: Sep 2019 Location: Finland Posts: 361	Examples of texture mapped vectors on A500? Just happened to watch [ Show youtube player ], since I wanted to listen to the music. The music is most excellent, but I didn't remember the demo had such impressive texture mapped vector looking things. How did the coder SIM implement those? What other demos or games did similar things?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
replace a color with a texture	turrican3	support.WinUAE	9	18 October 2019 08:10
WinUAE vectors with or without HD settings	Gilloo	support.WinUAE	7	26 September 2013 13:49
Speed! - no 3D texture mapping	s2325	HOL data problems	1	17 October 2010 16:32
Jagged / Prickly vectors...	vroom6sri	support.Demos	14	06 February 2007 22:19
Vectors-demo	Tim Janssen	request.Demos	3	12 March 2003 10:47

28 April 2021, 19:01	#2
DanScott Lemon. / Core Design Join Date: Mar 2016 Location: Tier 5 Posts: 1,211	I've never disassembled this to look, but I always had the feeling that he converted images into a format where he could just draw lines with the blitter and fill in 1 pass.

28 April 2021, 19:26	#3
Jobbo Registered User Join Date: Jun 2020 Location: Druidia Posts: 387	There's a lot going on there! The shapes don't seem to do the usual triangle warping so it doesn't seem to be linear interpolation and there are scenes with generic overdraw. I would guess it's an early c2p, would be really interested to know for sure. Maybe the coder took a look at the Dpaint plane code and made their own optimized version.

28 April 2021, 20:33	#4
Antiriad_UK OCS forever! Join Date: Mar 2019 Location: Birmingham, UK Posts: 418	I always really liked that demo and the music change to the running man bit. But damnnnnn that BBS phone number section is tortuous now

29 April 2021, 09:56	#7
morbid Registered User Join Date: Aug 2020 Location: Huddinge Posts: 24	I have always liked the vectors in this one: https://www.pouet.net/prod.php?which=19102

29 April 2021, 22:45	#9
cv643d Registered User Join Date: Jul 2002 Location: Sweden Posts: 762	I think he is a member here?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)