Simple 3D engine tech demo

[Rst7]

Hi all!

I want to share a small technical demo for you.

This is a simple 3D engine that I tried to get the most out of the stock configuration of the A1200. Yes, it's inspired by Dread, of course Thanks to KK/Altair for the "move.b ...,(a7)+" idea.

At this moment, 68020+AGA is enough to run the engine.
It is also possible to run on 68020+ECS+FastRAM (for example, A3000), but this has not yet been implemented.

This is how it looks in the emulator:
[ Show youtube player ]

I know that WinUAE does not emulate the 68020 quite correctly and on real hardware the performance is about 20% lower, but fps is still quite reasonable.

There have been many attempts to optimize all the important routines so that they fit into the 68020 instruction cache. Otherwise, nothing would have happened, just a slideshow

But yes, the presence of at least FastRam significantly increases fps.

Something I want to say about the graphics mode. Engine use Hires HAM6 + a very simple single-pass c2p to produce 160*100px 64 colors, unfortunately, without palette, only two bits per R, G, B.

You can see the source code here - https://github.com/Rst7CBSIE/SDDDE

In the attached archive - compiled executable code + the necessary data.

I almost forgot. The 3d model for this demo is taken from the famous Omniscent 4k intro.
But if you have a fastram, you can build from the sources a version with a 3d model from Spyro The Dragon.
Unfortunately, it is too big to fit in a chipram.

[grond]

Amazing! Well done!

[ross]

Very good job!

[Tigerskunk]

Simply WOW!

[Rst7]

3D model from Spyro The Dragon

[ Show youtube player ]

Run in WinUAE, A1200 + 4Mb FastRam

So, I have a question - does anyone want to take part in bringing this to something interesting?

[TCD]

Originally Posted by Rst7

I know that WinUAE does not emulate the 68020 quite correctly and on real hardware the performance is about 20% lower, but fps is still quite reasonable.

In video it is 5-6 FPS, so a real 68020 would run it at 4-5 FPS?

[Rst7]

Originally Posted by TCD

In video it is 5-6 FPS, so a real 68020 would run it at 4-5 FPS?

This number is not fps. This is render time in frames, so fps is 50Hz/counter, about 10 fps, but this is worst case.

Of course, if you mean the number under the picture on the video.

[TCD]

Originally Posted by Rst7

This number is not fps. This is render time in frames, so fps is 50Hz/counter, about 10 fps, but this is worst case.

Ah, okay. Then it is pretty impressive indeed Can you guys make a lo-fi Wipeout game? That would be swell

Originally Posted by Rst7

Of course, if you mean the number under the picture on the video.

Yep, I do

[remz]

This is incredibly amazing! It gives so much Descent vibes.
Amazing that you obtained such speed on a stock A1200.

[vulture]

Congratulations man, very impressive work!

[malko]

Great tech demo.
Reminds me "Descent"

[Tsak]

Mindblowing!!!

What about objects e.t.c. Biltting, sprites?

[nikosidis]

Whow! This would be very cool to at least see in Amiga scene demos.
There are very few demos for standard A1200 configuration.

[skan]

Originally Posted by tcd

ah, okay. Then it is pretty impressive indeed can you guys make a lo-fi wipeout game? That would be swell

This.

[ppill]

Remarkable stuff.
You're in Kharkiv right now? Stay safe!

[Reynolds]

Amazing. Wish to see it on my Amiga screen boosted with interactions.

[Rst7]

Originally Posted by Tsak

What about objects e.t.c. Biltting, sprites?

I'm still thinking about the best way to implement this.

Much depends on how the engine will be used. If 6DOF is not going to be used, then the best solution is to draw scaled sprites instead of real 3D objects (as in Doom, for example).

Also, you may have noticed that far surfaces are rendered without mapping. This is done for speed, but there is room for some optimization. Perhaps after this optimization, the use of 3d objects will not be so expensive.

In any case, a good result can only be obtained by finding compromises between the design of models and the capabilities of this extremely low-end engine.

[Karlos]

Very impressive! Does it use some affine texturing tricks for polygons closest to the player? I see some wobbling.

[Rst7]

Originally Posted by Karlos

Does it use some affine texturing tricks for polygons closest to the player? I see some wobbling.

Yes. All polygons are rendered with affine texture mapping, but nearby polygons are tessellated to a visible size of about 20*20 pixels. This is a compromise for speed. Tessellation + affine texturing is faster than classic render with U/Z, V/Z interpolation along edges and N*1px slices, but still with reasonable results.

For example:
result.png - visible image
tesselated.png - what really happened with polygons

[Karlos]

That's brilliant.