[dark Physics] object falls through floor.

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HowDo

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Joined: 28th Nov 2002

Location: United Kingdom

Posted: 14th Aug 2006 03:56

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OK , your turn to be clever, whats wrong with this.

+ Code Snippet

sync on
sync rate 60
phy start
autocam off
position camera 10,20,-95
point camera -25,10,0

rem ground
make object box 1,100,2,100
phy make rigid body static box 1

rem sphere
make object sphere 3,10
phy make rigid body dynamic sphere 3

do



phy update
sync
loop

Dark Physics makes any hot drink go cold.

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Black Mesa

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Posted: 14th Aug 2006 04:13

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Im not sure if this is what you wanted but what if you just position the sphere above the ground?

+ Code Snippet

sync on
sync rate 60
phy start
autocam off
position camera 10,20,-95
point camera -25,10,0

rem ground
make object box 1,100,2,100
position object 1 ,0,0,0
phy make rigid body static box 1

rem sphere
make object sphere 3,10
position object 3, 0,15,0
phy make rigid body dynamic sphere 3


do

phy update
sync
loop

Your mod has been erased by a signature

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Xarshi

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Joined: 25th Dec 2005

Location: Ohio

Posted: 14th Aug 2006 04:15 Edited at: 14th Aug 2006 04:15

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the sphere is being created inside of the ground. Thats the problem. Position it at 0,10,0 and it will work.

EDIT smeh,black mesa commented before me. But he was correct,position it above the ground.

Woohoo. DP is finally released!

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imekon

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Posted: 14th Aug 2006 09:29

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Here's the tunneling effect. You have to wait about a minute before the ball rockets past, straight through the floor.

+ Code Snippet

sync on
sync rate 60
phy start
autocam off
position camera 10, 20, -95
point camera -25, 10, 0

rem ground
make object box 1, 100, 0.1, 100
phy make rigid body static box 1

rem sphere
make object sphere 3, 1
position object 3, 0, 1000, 0
phy make rigid body dynamic sphere 3
phy set rigid body mass 3, 10000

do
   phy update
   sync
loop

Interesting as

+ Code Snippet

phy set continuous cd 1

has no effect.

"Reality Bites"

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Mike Johnson

TGC Developer

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Joined: 13th Sep 2002

Location: United Kingdom

Posted: 14th Aug 2006 10:17

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CCD commands have been updated for the next release. Testing went well over the weekend so expect to see it released today.

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HowDo

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Joined: 28th Nov 2002

Location: United Kingdom

Posted: 14th Aug 2006 15:16

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Mike ,or anyone

How do you put a dynamic object inside a static object

trying to put a box dynamic inside a static cylinder to make the box jump out and hit the sphere sitting on top.

+ Code Snippet

phy update
sync
loop
remend
sync on
sync rate 60
phy start
autocam off
position camera 10,20,-95
point camera -25,10,0

rem ground
make object box 1,100,2,100
position object 1 ,0,0,0
phy make rigid body static box 1
rem cylinder
make object cylinder 2,10
position object 2,0,1,0
phy make rigid body static box 2

rem sphere
make object sphere 3,10
position object 3, 0,15,0
phy make rigid body dynamic sphere 3

make object box 4,5,5,5
position object 4,0,10,0
phy make rigid body dynamic box 4
do

phy update
sync
loop

Dark Physics makes any hot drink go cold.

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imekon

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Joined: 3rd Jul 2006

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Posted: 14th Aug 2006 22:13

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The new 1.01 update states:

"To control the threshold at which CCD is applied use the command phy set rigid body ccd motion threshold to specify a minimum velocity for the use of CCD. I.e. below the motion threshold for the body only regular discrete collision detection is used. (This applies to absolute velocities and relative velocities(for dynamic vs dynamic CCD))"

Trouble is, it doesn't say what the parameters are - they are

phy set rigid body ccd motion threshold object-id, threshold

Unfortunately, I still can't get it to work - still tunnels.

+ Code Snippet

sync on
sync rate 60
phy start
autocam off
position camera 10, 20, -95
point camera -25, 10, 0

phy set continuous cd 1

rem ground
make object box 1, 100, 0.1, 100
phy make rigid body static box 1

rem sphere
make object sphere 3, 1
position object 3, 0, 1000, 0
phy make rigid body dynamic sphere 3
phy set rigid body mass 3, 10000
phy set rigid body ccd motion threshold 3, 0.00001

do
   phy update
   sync
loop

"Reality Bites"

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Mike Johnson

TGC Developer

21

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Joined: 13th Sep 2002

Location: United Kingdom

Posted: 14th Aug 2006 22:15

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You also need to switch CCD on for the rigid body using "phy set rigid body ccd 3, 1"

Here's a full program demonstrating how things work:

` this program demonstrates how continous collision detection
` can be applied to objects

` set up the program
autocam off
sync on
sync rate 60
hide mouse
randomize timer ( )
make light 1
set directional light 1, -5, -5, 5
backdrop off
phy enable debug
phy start

` create background sphere
load image "stripe5.png",1
make object sphere 2,400,48,48
texture object 2,1
scale object texture 2,6,6
set object cull 2,0

` create the floor object
load image "stripe6.png", 3
make object box 10, 50, 1, 50
position object 10, 0, -10, 0
texture object 10, 3
phy make rigid body static mesh 10

` turn ccd on
phy set continuous cd 1.0

` make object in centre with no ccd
make object cube 100, 5
position object 100, 0, 100, 0
phy make rigid body dynamic box 100
phy set rigid body linear velocity 100, 0, -1000, 0

` make object on left with ccd
make object cube 101, 5
position object 101, -20, 100, 0
phy make rigid body dynamic box 101
phy set rigid body linear velocity 101, 0, -1000, 0
phy set rigid body ccd 101, 1

` make object on right with ccd
make object cube 102, 5
position object 102, 20, 100, 0
phy make rigid body dynamic box 102
phy set rigid body linear velocity 102, 0, -1000, 0
phy set rigid body ccd 102, 1

` position and rotate the camera
position camera -46.8, 26.8, -49
rotate camera 34.7, 46.4, 0

` display the Dark Physics logo
load image "logo.png", 100000
sprite 1, 0, 600 - 60, 100000
set sprite 1, 0, 1

` main program loop
do
   set cursor 0, 0
   print "Continuous Collision Detection Example"
   print ""
   print "The objects on the left and right have CCD applied"
   print "They can move at high speeds and not penetrate the ground"
   print ""
   print "The object in the centre is not using CCD"
   print "As a result of this it will fall through the ground"

` rotate the sphere
   rotate object 2, object angle x ( 2 ) + 0.1, object angle y( 2 ) - 0.5, object angle z ( 2 ) + 0.3

` update the simulation and screen
   phy update
   sync
loop

+ Code Snippet


` this program demonstrates how continous collision detection
` can be applied to objects

` set up the program
autocam off
sync on
sync rate 60
hide mouse
randomize timer ( )
make light 1
set directional light 1, -5, -5, 5
backdrop off
phy enable debug
phy start

` create background sphere
load image "stripe5.png",1
make object sphere 2,400,48,48
texture object 2,1
scale object texture 2,6,6
set object cull 2,0

` create the floor object
load image "stripe6.png", 3
make object box 10, 50, 1, 50
position object 10, 0, -10, 0
texture object 10, 3
phy make rigid body static mesh 10

` turn ccd on
phy set continuous cd 1.0

` make object in centre with no ccd
make object cube 100, 5
position object 100, 0, 100, 0
phy make rigid body dynamic box 100
phy set rigid body linear velocity 100, 0, -1000, 0

` make object on left with ccd
make object cube 101, 5
position object 101, -20, 100, 0
phy make rigid body dynamic box 101
phy set rigid body linear velocity 101, 0, -1000, 0
phy set rigid body ccd 101, 1

` make object on right with ccd
make object cube 102, 5
position object 102, 20, 100, 0
phy make rigid body dynamic box 102
phy set rigid body linear velocity 102, 0, -1000, 0
phy set rigid body ccd 102, 1

` position and rotate the camera
position camera -46.8, 26.8, -49
rotate camera 34.7, 46.4, 0

` display the Dark Physics logo
load image "logo.png", 100000
sprite 1, 0, 600 - 60, 100000
set sprite 1, 0, 1

` main program loop
do
   set cursor 0, 0
   print "Continuous Collision Detection Example"
   print ""
   print "The objects on the left and right have CCD applied"
   print "They can move at high speeds and not penetrate the ground"
   print ""
   print "The object in the centre is not using CCD"
   print "As a result of this it will fall through the ground"

   ` rotate the sphere
   rotate object 2, object angle x ( 2 ) + 0.1, object angle y( 2 ) - 0.5, object angle z ( 2 ) + 0.3

   ` update the simulation and screen
   phy update
   sync
loop

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imekon

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Joined: 3rd Jul 2006

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Posted: 14th Aug 2006 22:25

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Your example works, however phy set rigid body ccd 102, 1 doesn't highlight in blue...

My example generates an error dialog:

PhysicsSDK::createCCDSkeleton: desc.isValid() is false!

+ Code Snippet

sync on
sync rate 60
phy start
autocam off
position camera 10, 20, -95
point camera -25, 10, 0

phy set continuous cd 1.0

rem ground
make object box 1, 100, 0.1, 100
phy make rigid body static box 1

rem sphere
make object sphere 3, 1
position object 3, 0, 1000, 0
phy make rigid body dynamic sphere 3
phy set rigid body mass 3, 10000
phy set rigid body ccd 3, 1
phy set rigid body ccd motion threshold 3, 0.00001

do
   phy update
   sync
loop

"Reality Bites"

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Mike Johnson

TGC Developer

21

Years of Service

User Offline

Joined: 13th Sep 2002

Location: United Kingdom

Posted: 14th Aug 2006 22:42

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Not updated the keywords file just yet so the new commands won't highlight.

There are some limitations when using CCD. Maybe in this case we need some extra commands so you can have your sphere but internally for CCD it uses a simpler shape to represent the skeleton.

Here's the cases for dynamic v static when CCD is performed:

* ccd is enabled
* only if the dynamic object has a ccd skeleton
* only if the point velocity on the body is above the ccd motion threshold
* only if the static object is a convex or mesh rigid body

And here's the cases for when dynamic v dynamic CCD is performed:

* ccd is enabled
* only if both shapes have ccd skeletons
* only if the point velocity on either of the bodies is above the ccd motion threshold
* only if the relative velocity of the bodies is above a small epsilon

With a few more commands for further control over this we should be able to get everything covered and ensure you can use it as you like.

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Dark Physics & Dark A.I. & Dark Dynamix / [dark Physics] object falls through floor.