ODE Physics & u7.5. Oh, Come on!

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WickedX

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 30th Oct 2010 23:30 Edited at: 31st Oct 2010 15:46

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Hi,

Just tried DarkPRINCIPLES, ODE Tutorials. http://www.dcforeman.co.uk. Tutorial 1-6, the ball appears to be static. This is the code, as I typed it.

+ Code Snippet

REM Project: ODE Tut 1-6
REM Created: 10/29/2010 7:18:05 PM
REM
REM ***** Main Source File *****
REM

Wait Key
Color Backdrop 0
Backdrop On
Disable Escapekey
Autocam Off
Position Camera 500, 500, -500
Point Camera 0, -250, 0

Make Object Sphere 1, 50
Make Object Plane 2, 500, 500
Rotate Object 2, -90, 0, 0
Position object 2, 0, -250, 0

ODE Start
ODE Set World Gravity 0, -2, 0
ODE Set World Step 0.1
ODE Set World CFM 0.02

ODE Create Dynamic Sphere 1
ODE Create Static Box 2

ODE Add Force 1, 0, 0, 2, 0, 0, 0
ODE SetSurface Mode Contact Bounce 1, 0
ODE Set Contact Bounce 1, 0.99
ODE SetSurface Mode Contact Soft ERP 1, 0
ODE Set Contact Soft ERP 1, 0.99
ODE SetSurface Mode Contact Soft CFM 1, 0
ODE Set Contact Soft CFM 1, 0.1

Repeat

   ODE Update

Until Escapekey() = 1

ODE End
Enable Escapekey
End

Also, newsletter issue 34, Getting Physical by Steve Vink. The example ODE Basics, the ball just flies off and all the blocks fall together through the floor. I have checked the upgrade7_5 text file. The only, changes made to ODE Physics was something to do with a memory leak. The newsletter example did work in u7.4. I have tried this on Window XP and Windows 7. I have also removed all third party dll’s, with no joy. I have used Newton Physics and Sparkys Collisions. I am just trying to figure out ODE Physics. So, if anyone here can help it would be appreciated.

Thank you,
Brian

Have netbook will travel.

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baxslash

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Bronze Codemaster

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Joined: 26th Dec 2006

Location: Duffield

Posted: 31st Oct 2010 08:11

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Quote: "all the blocks fall together through the floor"

Maybe try using a box instead of a plane? I haven't used ODE but I imagine this could be the problem.

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BillR

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Joined: 19th Mar 2003

Location: United States

Posted: 31st Oct 2010 08:16 Edited at: 31st Oct 2010 08:16

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Here is a working version for you..
make sure you read my y-rotate remarks
good luck

Rem Project: Dark Basic Pro Project
Rem Created: Saturday, October 30, 2010

REM
REM ***** Main Source File *****
REM

`Wait Key
Color Backdrop 0
Backdrop On
`Disable Escapekey
Autocam Off
Position Camera 500, 400, -500
Point Camera 0, 0, 0

Make Object Sphere 1, 50
Make Object box 2, 500, 20,500
`Rotate Object 2, -90, 10, 0
`Position object 2, 0, -250, 0
position object 1,0,200,0
color object 1,rgb(rnd(255),rnd(255),rnd(255))
color object 2,rgb(rnd(255),rnd(255),rnd(255))
xrotate object 2,15

ODE Start
`ODE Set World Gravity 0, -100, 0
ODE Set World Gravity 0, -200, 0    :`stronger gravity
ODE Set World Step 0.1
ode set world erp (0.4)*2.5         :`added this
ode set world cfm (10^-5)*2.5       :`0.000025
`ODE Set World CFM 0.02

ODE Create Dynamic Sphere 1         :`REM out the 2 yrotate line to see what I mean
yrotate object 2,180                :`ODE now Y-rotates objects 180 internally from earlier versions
ODE Create Static Box 2             :`so, you have to rotate the DBPro objects 180, set them in ODE
yrotate object 2,-180               :`then rotate them back for DBPro visuals to be right

ODE Add Force 1, 0, 0, 2, 0, 0, 0
ODE SetSurface Mode Contact Bounce 1, 0
ODE Set Contact Bounce 1, 0.99
ODE SetSurface Mode Contact Soft ERP 1, 0
ODE Set Contact Soft ERP 1, 0.99
ODE SetSurface Mode Contact Soft CFM 1, 0
ODE Set Contact Soft CFM 1, 0.1

Repeat

ODE Update

Until Escapekey() = 1

ODE End
Enable Escapekey
End

+ Code Snippet

Rem Project: Dark Basic Pro Project
Rem Created: Saturday, October 30, 2010

REM
REM ***** Main Source File *****
REM

`Wait Key
Color Backdrop 0
Backdrop On
`Disable Escapekey
Autocam Off
Position Camera 500, 400, -500
Point Camera 0, 0, 0

Make Object Sphere 1, 50
Make Object box 2, 500, 20,500
`Rotate Object 2, -90, 10, 0
`Position object 2, 0, -250, 0
position object 1,0,200,0
color object 1,rgb(rnd(255),rnd(255),rnd(255))
color object 2,rgb(rnd(255),rnd(255),rnd(255))
xrotate object 2,15

ODE Start
`ODE Set World Gravity 0, -100, 0
ODE Set World Gravity 0, -200, 0    :`stronger gravity
ODE Set World Step 0.1
ode set world erp (0.4)*2.5         :`added this
ode set world cfm (10^-5)*2.5       :`0.000025
`ODE Set World CFM 0.02



ODE Create Dynamic Sphere 1         :`REM out the 2 yrotate line to see what I mean
yrotate object 2,180                :`ODE now Y-rotates objects 180 internally from earlier versions
ODE Create Static Box 2             :`so, you have to rotate the DBPro objects 180, set them in ODE
yrotate object 2,-180               :`then rotate them back for DBPro visuals to be right

ODE Add Force 1, 0, 0, 2, 0, 0, 0
ODE SetSurface Mode Contact Bounce 1, 0
ODE Set Contact Bounce 1, 0.99
ODE SetSurface Mode Contact Soft ERP 1, 0
ODE Set Contact Soft ERP 1, 0.99
ODE SetSurface Mode Contact Soft CFM 1, 0
ODE Set Contact Soft CFM 1, 0.1

Repeat

   ODE Update

Until Escapekey() = 1

ODE End
Enable Escapekey
End

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WickedX

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 31st Oct 2010 16:41

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Thank you.

@baxslash: I will try that.

@BillR: Thanks for the example. I have modified my code.

+ Code Snippet

REM Project: ODE Tut 1-6
REM Created: 10/29/2010 7:18:05 PM
REM
REM ***** Main Source File *****
REM

Wait Key
Backdrop On
Color Backdrop 0
Disable Escapekey
Autocam Off
Position Camera 500, 500, -500
Point Camera 0, -250, 0

Make Object Sphere 1, 50
Make Object box 2, 500, 2, 500
Position Object 2, 0, -250, 0
Xrotate Object 2,15

ODE Start
ODE Set World Gravity 0, -200, 0
ODE Set World Step 0.02
ODE Set World ERP (0.4)*2.5
ODE Set World CFM (10^-5)*2.5

ODE Create Dynamic Sphere 1
Yrotate Object 2,180
ODE Create Static Box 2
Yrotate Object 2,-180

` ODE Add Force 1, 0, 0, 2, 0, 0, 0
ODE SetSurface Mode Contact Bounce 1, 0
ODE Set Contact Bounce 1, 0.99
ODE SetSurface Mode Contact Soft ERP 1, 0
ODE Set Contact Soft ERP 1, 0.99
ODE SetSurface Mode Contact Soft CFM 1, 0
ODE Set Contact Soft CFM 1, 0.1

Repeat

   ODE Update

Until Escapekey() = 1

ODE End
Enable Escapekey
End

I noticed you have slanted the ground to get the ball bouncing in the z direction. So, then it would appear the ODE Add Force command has no effect. You have any info on this.

Thanks again.
Brian

Have netbook will travel.

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DarkBASIC Professional Discussion / ODE Physics & u7.5. Oh, Come on!

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DarkBASIC Professional Discussion / ODE Physics &amp; u7.5. Oh, Come on!

DarkBASIC Professional Discussion / ODE Physics & u7.5. Oh, Come on!