Physics does not follow offset - GameCreators Forum

Author

Message

Codger

22

Years of Service

User Offline

Joined: 23rd Nov 2002

Location:

Posted: 11th Feb 2007 20:08

Link

I had the need to rotate an object offset from center (e.g. a pinball flipper) I used the offset limb command and visually this worked . I set physics of the object to kinematic and the rotation also appears to work. However collisions do not

+ Code Snippet

REM Project: OFFSET LIMB
REM Created: 2/11/2007 10:36:39 AM
REM
REM ***** Main Source File *****
REM

randomize timer()
phy start
rem phy set gravity 0,-9.8,0
phy set skin width 0.01
SET AMBIENT LIGHT 60
autocam off
SYNC ON : SYNC RATE 60

MyFloor = 1
Make object Box MyFloor, 10,1,10
position object Myfloor, 0,-.5,0
color object Myfloor, RGB(255,255,0)
Phy make rigid body static box MyFloor

Flipper = 2
Make object Box Flipper, 5.0,1,1
position object Flipper, 0,.5,0
offset limb Flipper,0,2.5,0,0
Phy Make rigid body dynamic box Flipper
Phy set rigid body kinematic Flipper,1

Ball1 = 3
Make object sphere Ball1,1,16,16
position object Ball1, 4,1.5,0
Phy Make rigid body dynamic sphere Ball1

Ball2 = 4
Make object sphere Ball2,1,16,16
position object Ball2, 0,1.5,-2.0
Phy Make rigid body dynamic sphere Ball2

position camera 0, 1,5,-10
Point camera 0, 0,.5,0

Do
   inc Yr#,.6
   phy set rigid body kinematic rotation Flipper, 0, Yr#, 0
   phy update
   sync
Loop

I have never been to happy with the Joints commands (they are springy) any other suggestions

Thanks in Advance

Codger

System
PIV 2.8 MZ 512 Mem
FX 5600 256 mem

Back to top

Profile PM Email

lukas

18

Years of Service

User Offline

Joined: 22nd Dec 2005

Location:

Posted: 12th Feb 2007 20:36

Link

Hi,
I think using the limb-commands in an active physX event doesn't work, because these are two different groups of commands (dbp and dark physX). Probably you have to use the joint commands from dark physX.
Just watch the "Advanced Machinery" example. It may help you.

lukas

Back to top

Profile PM

Codger

22

Years of Service

User Offline

Joined: 23rd Nov 2002

Location:

Posted: 13th Feb 2007 03:09

Link

lukas
I know how to use the joint commands I just find their performance unsatisfactory. I may try to shift the mesh off center and see if DP follows that

Codger

System
PIV 2.8 MZ 512 Mem
FX 5600 256 mem

Back to top

Profile PM Email

Cash Curtis II

19

Years of Service

User Offline

Joined: 8th Apr 2005

Location: Corpus Christi Texas

Posted: 13th Feb 2007 09:14

Link

Offset it in your modeling program rather than with code, then it should work okay.

Come see the WIP!

Back to top

Profile PM

Codger

22

Years of Service

User Offline

Joined: 23rd Nov 2002

Location:

Posted: 14th Feb 2007 01:55

Link

Here is a new version using Vertex manipulation rather than offseting the limb

REM Project: OFFSET LIMB
REM Created: 2/11/2007 10:36:39 AM
REM
REM ***** Main Source File *****
REM

randomize timer()
phy start
rem phy set gravity 0,-9.8,0
phy set skin width 0.01
SET AMBIENT LIGHT 60
autocam off
SYNC ON : SYNC RATE 60

GLOBAL ScreenCenterX : ScreenCenterX = screen Width()/2
GLOBAL ScreenCenterY : ScreenCenterY = screen Height()/2

MyFloor = 1
Make object Box MyFloor, 10,1,10
position object Myfloor, 0,-.5,0
color object Myfloor, RGB(255,255,0)
Phy make rigid body static box MyFloor

Flipper = 2
Make object Box Flipper, 5.0,1,1
ShiftObjectBox( Flipper,2.5,0.0,0.0)
position object Flipper, 0,0.5,0

rem offset limb Flipper,0,2.5,0,0
Phy Make rigid body dynamic box Flipper
Phy set rigid body kinematic Flipper,1

Ball1 = 3
Make object sphere Ball1,1,16,16
position object Ball1, 4,1.5,0
Phy Make rigid body dynamic sphere Ball1

Ball2 = 4
Make object sphere Ball2,1,16,16
position object Ball2, 0,1.5,-1.0
Phy Make rigid body dynamic sphere Ball2

position camera 0, 1,5,-10
Point camera 0, 0,.5,0

Do
   inc Yr#,
   phy set rigid body kinematic rotation Flipper, 0, Yr#, 0
   phy update
   sync
Loop

function ShiftObjectBox( ObjectNumber, Xp#,Yp#,Zp#)
`A function to make a capsule object

lock vertexdata for limb ObjectNumber, 0, 1

for Vertex = 0 to get VertexData Vertex Count()
      `Get the vertex's current position
      xPosition# = get VertexData Position X( Vertex )
      yPosition# = get VertexData Position Y( Vertex )
      zPosition# = get VertexData Position Z( Vertex )
      set VertexData Position Vertex, xPosition#+Xp#, yPosition# +Yp#, zPosition#+Zp#
   next Vertex

unlock vertexdata

`Make the finished object
   make mesh from object 5000, ObjectNumber  `Save the capsule shaped mesh
   delete object ObjectNumber                `Delete the temporary object
   make object ObjectNumber, 5000, 0         `Make a new object from the mesh
   delete mesh 5000                          `Delete the mesh
endfunction

+ Code Snippet

REM Project: OFFSET LIMB
REM Created: 2/11/2007 10:36:39 AM
REM
REM ***** Main Source File *****
REM

randomize timer()
phy start
rem phy set gravity 0,-9.8,0
phy set skin width 0.01
SET AMBIENT LIGHT 60
autocam off
SYNC ON : SYNC RATE 60

GLOBAL ScreenCenterX : ScreenCenterX = screen Width()/2
GLOBAL ScreenCenterY : ScreenCenterY = screen Height()/2

MyFloor = 1
Make object Box MyFloor, 10,1,10
position object Myfloor, 0,-.5,0
color object Myfloor, RGB(255,255,0)
Phy make rigid body static box MyFloor

Flipper = 2
Make object Box Flipper, 5.0,1,1
ShiftObjectBox( Flipper,2.5,0.0,0.0)
position object Flipper, 0,0.5,0

rem offset limb Flipper,0,2.5,0,0
Phy Make rigid body dynamic box Flipper
Phy set rigid body kinematic Flipper,1

Ball1 = 3
Make object sphere Ball1,1,16,16
position object Ball1, 4,1.5,0
Phy Make rigid body dynamic sphere Ball1

Ball2 = 4
Make object sphere Ball2,1,16,16
position object Ball2, 0,1.5,-1.0
Phy Make rigid body dynamic sphere Ball2

position camera 0, 1,5,-10
Point camera 0, 0,.5,0

Do
   inc Yr#,
   phy set rigid body kinematic rotation Flipper, 0, Yr#, 0
   phy update
   sync
Loop

function ShiftObjectBox( ObjectNumber, Xp#,Yp#,Zp#)
`A function to make a capsule object

   lock vertexdata for limb ObjectNumber, 0, 1

   for Vertex = 0 to get VertexData Vertex Count()
      `Get the vertex's current position
      xPosition# = get VertexData Position X( Vertex )
      yPosition# = get VertexData Position Y( Vertex )
      zPosition# = get VertexData Position Z( Vertex )
      set VertexData Position Vertex, xPosition#+Xp#, yPosition# +Yp#, zPosition#+Zp#
   next Vertex

   unlock vertexdata

   `Make the finished object
   make mesh from object 5000, ObjectNumber  `Save the capsule shaped mesh
   delete object ObjectNumber                `Delete the temporary object
   make object ObjectNumber, 5000, 0         `Make a new object from the mesh
   delete mesh 5000                          `Delete the mesh
endfunction

System
PIV 2.8 MZ 512 Mem
FX 5600 256 mem

Back to top

Profile PM Email

Sorry your browser is not supported!

Dark Physics & Dark A.I. & Dark Dynamix / Physics does not follow offset