Implementation Rails
- Thread starter Adeon
- Start date
I just saw the tweet this morning - nice work! Now make all the stuff moving! 
tada, implemented an impulse constraint solver .
here are my resources if you want to look at it to:
http://myselph.de/gamePhysics/equalityConstraints.html
http://www.dyn4j.org/2010/09/distance-constraint/
http://allenchou.net/2013/12/game-physics-constraints-sequential-impulse/
https://github.com/wnbittle/dyn4j/blob/bc5d61991f823e1927bdc0fbfeac668ab2b2c838/src/org/dyn4j/dynamics/contact/SequentialImpulses.java
http://www.cs.ucsb.edu/~cse/Files/Stabilization071993.pdf
In terms of what I plan going forward with this. I'm going to remove large rails and reduce it down to just carts. I'm just going to work on refining and improving carts. So at the moment I'm looking into implementing some form of constraint model. It's fairly basic at the moment but it shows a proof of concept. The mod still is fairly buggy with my changes so those problems need to be addressed before I release this.
Bugs
.here are my resources if you want to look at it to:
http://myselph.de/gamePhysics/equalityConstraints.html
http://www.dyn4j.org/2010/09/distance-constraint/
http://allenchou.net/2013/12/game-physics-constraints-sequential-impulse/
https://github.com/wnbittle/dyn4j/blob/bc5d61991f823e1927bdc0fbfeac668ab2b2c838/src/org/dyn4j/dynamics/contact/SequentialImpulses.java
http://www.cs.ucsb.edu/~cse/Files/Stabilization071993.pdf
In terms of what I plan going forward with this. I'm going to remove large rails and reduce it down to just carts. I'm just going to work on refining and improving carts. So at the moment I'm looking into implementing some form of constraint model. It's fairly basic at the moment but it shows a proof of concept. The mod still is fairly buggy with my changes so those problems need to be addressed before I release this.
Bugs
- If a cart is moving too fast it can skip a rail segment and cause an out of bounds exception
- It's possible for a cart to set the location to NAN
- rail placement is annoying
- switches don't work at all with the wrench
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Added Baumgarte stabilization so the carts don't intersect. I've made a couple slight changes to the collide event for this to work. Something else will need to be worked out for physics.
https://github.com/MovingBlocks/Terasology/pull/2868
https://github.com/MovingBlocks/Terasology/pull/2868
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At the moment I want to get the module to have feature parity with the old one. I think it would be a good idea to create a feature list. I've been debating what feature to work into this module and what would be better fit into a different module. Some of the more base things such as cart joining would need to be re-implemented along with all the bugs that still exist with the constraint solver I wrote. The cart motion is a still pretty unstable but that is going to have to be a work in progress.
Hey @Adeon ! Great to see you again. Hope all is well
@Nihal Singh has integration with Rails as a bonus item for one of our GSOC projects. @Michael and @SkySom have been tweaking at it occasionally. Maybe by summer's end we could have a really cool system working!
GitHub has introduced "projects" which allow for a new way to note down ideas before they become full issues. Might be an idea to start one for Rails + related (since it may end up involving multiple modules). Here's Nihal's for example: https://github.com/orgs/Terasology/projects/1
@Nihal Singh has integration with Rails as a bonus item for one of our GSOC projects. @Michael and @SkySom have been tweaking at it occasionally. Maybe by summer's end we could have a really cool system working!
GitHub has introduced "projects" which allow for a new way to note down ideas before they become full issues. Might be an idea to start one for Rails + related (since it may end up involving multiple modules). Here's Nihal's for example: https://github.com/orgs/Terasology/projects/1
Maybe I can help you to finish current work?
Thanks =)Hey @Adeon ! Great to see you again. Hope all is well
I will check it out =)
Have you had a chance to try out the changes I made to master? You can start from there and I can probably start working on a features list later today. As a base mod what do you think should be added in terms of carts. I don't want to add too much and would rather like to focus on helping people extend onto carts for different mods. @Adeon have you joined the slack channel?
https://github.com/orgs/Terasology/projects/6
https://github.com/orgs/Terasology/projects/6
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I've been trying to force myself to try work on this some more. So I've implemented a portion of the solver to handle the player and cart interactions. The old implementation seemed to be heavily dependent on frame rate. Generally a higher framerate would allow the player to push the cart faster because the contact events we're triggered more. The click bug seems to be back again; so I'll probably try to hunt that down again. There is still that annoying bug where the rail will appear one way but the track segment is different. I have no way of reproducing this consistently, so I really have no idea how it occurs.
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Very nice! Is it possible to climb inside one or put stuff in them?
Also - is there a way to scale up the whole thing, to make it "real" train sized? So that a person could hop on? Just thinking of Metal Renegades again: http://forum.terasology.org/threads/metal-renegades-wild-west-meets-robots.1079/
I have that segment bezier module that could be used to make larger tracks. At the moment I'm just focusing on this single block module. you should be able to climb in these with the E button. I've been slightly reworking how the solver works and I've been pretty happy with the results thus far. I also recently added network support for this module. The old module had some code for larger tracks, but I've rescoped this down and focused on the single block carts.