Rendering in U7

[SomeDude]

Hello, i'm myself a curious programmer, and just wondered about how is rendering in exult done.

[SomeDude]

And by rendering i mean map rendering, every item and npc in the world.

[drcode]

The code is in gamerend.cc, I believe. First we render the flat tiles, then the various objects using a complicated algorithm that nobody understands.

[SomeDude]

Wow, thanks for the hints. Reading it now.

[Colourless]

The most peculiar thing about how Exult renderers is all the objects are sorted as they are added into their 'chunk'. Exult doesn't do sorting when doing actual rendering. (Note I haven't checked the code in years, it may have changed, but I doubt it)

[Dominus]

funnily, thanks to Dale, I found a strange render bug.
When you place an object on an egg the object will get the same coordinates as the egg (x,y,z). Unfortunately if there is already an object in that spot with exact the same coordinates, the new placed object is sorted *beneath* the old object...
http://sourceforge.net/tracker/?func=de ... tid=102335

[drcode]

Yes, we pre-sort everything. I thought it would be too slow to do it during rendering.

What makes it so hard is that many objects occupy the same space, like paintings on walls.

[SomeDude]

But at some time npcs will walk, so there must be more sortings mechanisms. Not counting with projectiles. Am i wrong?

[drcode]

At each frame, the NPC is removed from the list and then added back at the new spot.

[SomeDude]

Ah, i see. Thanks for your explanations