New demo uploaded: 3d wire frame animated spaceship

desertfish · Post by **desertfish** » Mon Sep 07, 2020 2:00 am

3d wire frame animated spaceship

3d animated Cobra MK3 ship from Elite! Uses 16 bits integer math and has hidden-line removal..

This is an almost 1-to-1 conversion of the same program I wrote for the C64, but it runs a lot faster on the CommanderX16 ?

Here is the (prog8) source code https://github.com/irmen/prog8/blob/master/examples/cx16/cobramk3-gfx.p8

I haven't figured out how to wait for the Vertical blank yet, to reduce the flickering perhaps...

Submitter

desertfish

Submitted

09/07/20

Category

Demos

AndyMt · Post by **AndyMt** » Mon Sep 07, 2020 6:33 am

Oh nice! I can already see something like "Elite" coming...

desertfish · Post by **desertfish** » Mon Sep 07, 2020 8:04 am

Ok you put me on a mission ? I now have to at least put all Elite's ship models into that program https://www.c64-wiki.com/wiki/Elite#Spaceship_types

And we also have text mode Elite http://www.elitehomepage.org/text/index.htm

So who knows ?

edit: Right, that same site hosts various 3d model source files of the Elite shipts. I cobbled up a quick model viewer in Python.... Going to use that to convert the data into binary arrays that I can read into my 6502 program !

desertfish · Post by **desertfish** » Wed Sep 09, 2020 11:46 pm

Yay, the exported ship data works in the Commander X16 version! Attempt for the next version to implement hidden line removal in this version too.

Cyber · Post by **Cyber** » Thu Sep 10, 2020 8:05 am

Wow! Are you serious about Elite?

desertfish · Post by **desertfish** » Thu Sep 10, 2020 9:47 am

Nah, I'm not going to recreate Elite, the game. That would be way too much work. The 3d code is not a full 3d engine but just capable of showing one spinning object in the center of the screen ? I'm not going to expand that. I do want to add hidden line removal to it though and the other dozen or so ship models. As a separate project maybe to compile or convert that text-mode Elite trading program. That should be doable and will result in a fun little space trading game program (without fancy graphics though)

Cyber · Post by **Cyber** » Sun Sep 13, 2020 3:57 am

I see. You can add spinning 3D ships to the same project as an encyclopedia entries.

Nickenstein · Post by **Nickenstein** » Mon Sep 14, 2020 11:00 pm

Awesome! ?

I'm new here, and I don't have time to experiment until the weekend, but something I wanted to try was making a fixed-point math library with some vector-matrix-mult routines. I think you have beaten me to the punch on that! ?

desertfish · Post by **desertfish** » Tue Sep 15, 2020 12:47 am

For this program I am not using a fixed point math library perse. The math library that I use only has primitives for calculations on byte and word values.

The program (written in prog8) does the actual 3d calculations taking fixed-point scaling into account. So a hand written math library with 3d routines as well is still useful as it will be quite a bit faster that my generated assembly code I can imagine.

desertfish · Post by **desertfish** » Wed Sep 16, 2020 9:30 pm

Slight update, I'm slowly working towards adding that hidden line removal. The actual math required isn't in there yet but I think I have the ship model data complete for it.

Also I've looked at the source code of the text-Elite and it seems a lot more work to convert it to Prog8 than I anticipated. It is still something I would like to complete though, if only to validate the practical applicability of the language.