What´s wrong with this Train Bounding Boxes?

temporal8 · Post by **temporal8** » 28 Jul 2023 21:28

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I estimate that it has to do with the Locomotive bounding box height, but I understand that I cannot increase the height in vehicles, right?

: tgv.png (532.46 KiB) Viewed 2913 times

Brickblock1 · Post by **Brickblock1** » 28 Jul 2023 21:47

temporal8 wrote: ↑28 Jul 2023 21:28 .
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I estimate that it has to do with the Locomotive bounding box height, but I understand that I cannot increase the height in vehicles, right?

tgv.png

The problem isn't the height but rather that the graphics are larger than the bounding box

Eddi · Post by **Eddi** » 29 Jul 2023 06:38

in general, trying to fix a problem by increasing the bounding box size is a bad idea. because bigger bounding boxes makes it more likely that bounding boxes overlap, and once you have overlapping bounding boxes, it's basically game over.

Eddi · Post by **Eddi** » 29 Jul 2023 06:43

a long time ago i made a topic on this: viewtopic.php?t=53511

i've also later made a set based on this idea. (but it was never finished)

Eddi · Post by **Eddi** » 29 Jul 2023 07:08

also, if you think your train clipping with stations is bad, try to send it into a depot or tunnel

temporal8 · Post by **temporal8** » 29 Jul 2023 16:58

Eddi wrote: ↑29 Jul 2023 06:43 a long time ago i made a topic on this: viewtopic.php?t=53511

i've also later made a set based on this idea. (but it was never finished)

Yes i Saw, Anyway my idea is not to smooth the curves but just to make them long.

I had a similar problem a while back with my stations and Real Houses buildings and I fixed it by increasing the height of the bounding boxes (which is possible in stations and objects but I understand not in trains)
viewtopic.php?t=90208

Another approximation would be the one used by the guys from CZ, 1 partial sprite for each of the 3 parts that make up a vehicle BUT on slopes and horizontal rails only 1 long sprite, but I don't know how they did it.

Eddi · Post by **Eddi** » 30 Jul 2023 00:25

yes, higher bounding boxes is not possible for trains, it would clash with the bounding boxes of trains on bridges and catenaries. like i said, if bounding boxes overlap it's game over.

the 3-part trains is what "most" people use nowadays, it's the evolution of that old post i made.

the smooth curves is just a bonus, not necessary.

the way you detect curves and slopes to switch between 3-part and single-part drawing is with var 0x62

temporal8 · Post by **temporal8** » 30 Jul 2023 13:38

I'm thinking that I could try to make progress in terms of trains if I take into account the 3 parts regarding the slopes and the smooth curves too, I think that this has not advanced due to the difficulty of drawing so many graphics but when modeling in 3d that is more simple, i can try.

I wrote to Stefino_cz about the slopes and I would like to deepen about the smooth curves, somewhere in the forum is the nml code? I have searched about Britrains and CETS but I have not found the source code.

I think that one of the things that we like the most about Openttd are the trains, and I think that paving the way for trains with realistic proportions in 32bpp would be a very good idea.

Eddi · Post by **Eddi** » 31 Jul 2023 02:09

the CETS code used to be on the (now defunct) devzone. i still have it, but i never got round porting it to github

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