Road rendering like in Top Gear 2

[pettersson]

Hi,

are there any demos/explanations on how to achieve a road rendering like in Top Gear 2? Or any other racing game of that time
I know it's done using HDMA effects for curves and the imitation of a moving road but I cannot get my head around it. And it's hard to google for "road rendering" - even samples or explanations for Amiga/C64 (anything pre-3d) would be helpful

[Myself086]

It's the same as 3D texture rendering but it's rendered onto a 1D plane instead of 2D. 1D plane being the HDMA table.

The road is a line strip where each vertex is 3D calculated and affine rendered. Top Gear 2 uses a lot of vertices, one per color change on the side of the road (white-blue lines, idk what they're called). Level data controls 1 vertex every 4 rendered and are smoothed out from what seems to be bezier curve.

The game seems to handle 3D math very well. Even camera rotation looks accurate after testing with extreme hills (hack).

EDIT: Correction on vertex count.

[secondsun]

The phrase you're looking for is "raster racer". Here's an article that talks about building one : https://jakesgordon.com/writing/javascript-racer/

[freem]

Another reference for this kind of thing can be found here: http://www.extentofthejam.com/pseudo/

[pettersson]

Thanks for the hints!
"Raster Racer" - did not think of that...

[Oziphantom]

Here is an open source C64 racing game engine https://github.com/martinpiper/C64Publi ... RacingGame