mattb's Forum Posts

• • mattb
  • 
  • • Joined 21 Nov, 2012
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    • 14 topics • 157 posts
  • 1

  • 27 Nov, 2015
  • Quote

  Here's a few ways to make a single-segment rope joint:

  https://dl.dropboxusercontent.com/u/523 ... oints.capx

  I think the slide joint with some kind of rotation damping on the lamp would be my preference - it give you an elastic cable, a bit more interesting than the stiff pivot joint.

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 14 Nov, 2015
  • Quote

  Chipmunk is a good choice - I posted a wip example of a physics platformer in that thread: https://dl.dropboxusercontent.com/u/523 ... pe_v2.capx

  I'm setting velocity directly, which should usually be avoided in a physics engine, but because I'm raycasting to test if you're next to a wall or on a slope I can prevent any clipping issues.

  The reliable way to accelerate your player is by applying force (impulses are for instant movements like explosions or jumping). It won't cause any clipping problems. You can give the player a speed limit with the set max speed action, then decelerate by either increasing grounded friction or applying a force opposite to player.chipmunk.angleOfMotion.

  Lots of ways to do it, just play around. For raycasting (to get info about what the player is in contact with, or will be in the next frame) check out events 30-39 in my example.

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 12 Nov, 2015
  • Quote

  I meant you just have everything pinned to one big collision poly (either built manually or using some setup that generates a collision hull for the polygon plugin).

  Something that physics sims are really good for in random 'dungeon' generation is spacing out a bunch of rooms. Spawn a cluster of shapes & run the simulation for a while:

  
• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 11 Nov, 2015
  • Quote

  CrudeMik

  I had a quick go at making a lattice structure like in your first image using both the stock physics & chipmunk behaviors. It's possible to joint everything together, but once you apply a force to the structure the physics starts madly shaking. This was jointing everything to a central sprite, all sprites not colliding.

  You could try a more triangulated jointing between the components, that might help, but I've got a feeling that these massive linkages will never work.

  Maybe they could be non-colliding things in the background, with selected areas that you can dock with, or have a single collision polygon with all the structure sprites pinned to it?

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 10 Nov, 2015
  • Quote

  I remember having trouble with limited revolute joints a while back when doing a ragdoll. I think what I was doing wrong then was using absolute angles for the rotation limits when they should be relative to the object's default zero degree position (i think). Anyway here's what it looked like:

  https://dl.dropboxusercontent.com/u/523 ... Joints.png

  I hope this is going to be a space station for your mining game <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 8 Nov, 2015
  • Quote

  czar

  I remember those, really ahead of their time. I'm assuming this will be single-player, so you could look into creating some grid-based LOS systems using events, for player FOV, grenade area etc.

  Here's a really quickly implemented grid LOS done for a game jam (click on Stealth Chess):

  If you're using a tilemap for the levels, Easystar is a good alternative to the stock pathfinding behavior:

  For proper raycasting in C2 instead of messing with the LOS behavior or fiddling with sprites then the Chipmunk physics behavior is the way to go:

  Let me know if you want some pointers for that one, it can be tricky to figure out.

• • mattb
  • 
  • • Joined 21 Nov, 2012
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    • 14 topics • 157 posts
  • 1

  • 2 Nov, 2015
  • Quote

  doh, been having a bad debugging day. thanks <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile"> here's the fixed setup for anyone that's interested: https://dl.dropboxusercontent.com/u/523 ... Fixed.capx

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 2 Nov, 2015
  • Quote

  Thanks! That does help, which is strange because I also tried excluding the last hit object from the Laser function & that did nothing.

  It's still not working fully though. Check this screenshot, there should be 10 segments showing but only 7 are made (this is with hitX/Y moved out 10 pixels):

  https://dl.dropboxusercontent.com/u/523 ... erfail.png

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 2 Nov, 2015
  • Quote

  R0J0hound (& anyone else)

  Here's a capx of the problem mentioned above. I can't see why this doesn't work, maybe it's something chipmunk-specific that i'm missing?

  https://dl.dropboxusercontent.com/u/523 ... nTest.capx

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 1 Nov, 2015
  • Quote

  Got a strange issue that I can't figure out. I'm doing a reflected lasers thing which works when the reflectors have circle collision shapes, but not box or segment.

  Here's some screencaps to show the problem. First the circle colls which work as expected:

  https://dl.dropboxusercontent.com/u/523 ... Colls.webm

  Now box colls:

  https://dl.dropboxusercontent.com/u/523 ... Colls.webm

  This is the event sheet. A pool of laser & hit sprites are created on start, then every tick they're moved offscreen before some recursive raycasting happens:

  https://dl.dropboxusercontent.com/u/523 ... roblem.png

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• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 1 Nov, 2015
  • Quote

  Halloween 1HGJ:

  Platforms of the Dead (theme: Horror)

  

  Playable link: https://dl.dropboxusercontent.com/u/523 ... index.html

  Source: https://dl.dropboxusercontent.com/u/523 ... eDead.capx

  music from: http://nervoustestpilot.co.uk/album/def ... xe-edition

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 25 Oct, 2015
  • Quote

  I'd never have got that, thanks <img src="{SMILIES_PATH}/icon_e_biggrin.gif" alt=":D" title="Very Happy">

  Here's the fixed capx in case anyone's interested: https://dl.dropboxusercontent.com/u/523 ... test2.capx

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 23 Oct, 2015
  • Quote

  R0J0hound

  Any idea how to set phase for these gear joints? I've tried signed angle difference & that doesn't work:

  https://dl.dropboxusercontent.com/u/523 ... rtest.capx

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 23 Oct, 2015
  • Quote

  Giganten

  I've found that as long as physics shapes are fired & deflected using forces or impulses the collisions are ok (for realistically high speeds, I haven't tried super fast). It's only when you set velocity manually that things start intersecting a lot, so avoid that if you can.

  Waltuo

  This is how I'm doing buttons in a platformer where they're triggered by physics. No chipmunk on the button, just overlap testing:

  https://dl.dropboxusercontent.com/u/523 ... events.png

• • mattb
  • 
  • • Joined 21 Nov, 2012
    • 
    • 14 topics • 157 posts
  • 1

  • 23 Oct, 2015
  • Quote

  CrudeMik

  I see what you mean now about wanting the artwork to be loose & sketchy - those sfx made me think of japanese kite fighting. It'd look great if it was done like sumi-e brushwork with ink splatter trails & particles.