Odd physics behavior in Blender Game Engine under Windows Only #32861

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Martin Felke · 2012-10-12T22:21:36+02:00

Martin Felke commented

2012-10-12 22:21:36 +02:00

Category: Physics

%%%Hi,

if you open the provided testfile in blender 2.64a or newer under Windows 7 64 bit, the moving fractured torus shows odd behavior (jumping around, falling thru the ramp)
when colliding with the ramp. Under Ubuntu 12.04 and Mac OS X 10.7.5 (all on the same machine) everything works as expected. The torus rolls down the slope and desintegrates on collision with the ramp and the wall at the bottom.

Tested with Blender rev. 51287

CPU: I7 2600
GPU: Geforce GTX 580
RAM: 16GB

scorpion81%%%

**Category**: Physics %%%Hi, if you open the provided testfile in blender 2.64a or newer under Windows 7 64 bit, the moving fractured torus shows odd behavior (jumping around, falling thru the ramp) when colliding with the ramp. Under Ubuntu 12.04 and Mac OS X 10.7.5 (all on the same machine) everything works as expected. The torus rolls down the slope and desintegrates on collision with the ramp and the wall at the bottom. Tested with Blender rev. 51287 CPU: I7 2600 GPU: Geforce GTX 580 RAM: 16GB scorpion81%%%

Martin Felke commented

2012-10-12 22:21:36 +02:00

Changed status to: 'Open'

Martin Felke commented

2012-10-12 22:24:13 +02:00

%%%argh, testfile was not zipped...%%%

Inês Almeida commented

2014-06-13 21:23:58 +02:00

Added subscriber: @brita

Inês Almeida commented

2014-06-13 21:23:58 +02:00

Can someone test this on windows?
Since when is the 'odd behaviour' happening?

Can someone test this on windows? Since when is the 'odd behaviour' happening?

Martin Felke commented

2014-07-12 19:02:03 +02:00

Just tested again in official blender 2.71 under linux and windows.
Looks like the "odd" behavior in windows is not so visible any more, but the simulation notably behaves different to blender under linux.
For example, the torus rolling down the slope seems to get stuck at the first cylinder reproducibly, while it rolls down further in the linux version.
(I have set the "Freq" in the Property Sensor to 100 in both cases)

I know, that is no real bug for now, but in the old test the torus for example fell through the floor with no collision.
I also know that simulations depend on many parameters, possibly from certain os dependent behavior too.
So i would think this is no bug per se, and is very hard to tackle at all.... but it can be a bit annoying as well if the same file simulates differently under
different os.

Personally i dont use windows very much (using it becomes more and more a pain)... my main system for blender and coding is linux.
I am not sure how many other users are affected by those different simulation behaviors.... but just wasting development time for a single users problem (mine)
is probably out of question too...

All in all, i really dont know whether this bug should be closed or not... the oddity under win has reduced significantly compared to the last test with 2.64 in 2012,
but isn't gone completely.

Just tested again in official blender 2.71 under linux and windows. Looks like the "odd" behavior in windows is not so visible any more, but the simulation notably behaves different to blender under linux. For example, the torus rolling down the slope seems to get stuck at the first cylinder reproducibly, while it rolls down further in the linux version. (I have set the "Freq" in the Property Sensor to 100 in both cases) I know, that is no real bug for now, but in the old test the torus for example fell through the floor with no collision. I also know that simulations depend on many parameters, possibly from certain os dependent behavior too. So i would think this is no bug per se, and is very hard to tackle at all.... but it can be a bit annoying as well if the same file simulates differently under different os. Personally i dont use windows very much (using it becomes more and more a pain)... my main system for blender and coding is linux. I am not sure how many other users are affected by those different simulation behaviors.... but just wasting development time for a single users problem (mine) is probably out of question too... All in all, i really dont know whether this bug should be closed or not... the oddity under win has reduced significantly compared to the last test with 2.64 in 2012, but isn't gone completely.

Inês Almeida commented

2014-07-15 18:55:20 +02:00

tested with a current version on both mac and linux 490da48
the behaviour is in fact slightly different, in linux it is rolling further than in mac.
So the initial 'odd behaviour' is now gone, but it is still slightly different in different platforms. This should not happen :) Don't worry about wasting time! It should just be consistent across all supported platforms.
@scorpion81 can you try to isolate the problem? With a simpler blend file, so I can try to understand if it is a problem in bullet or blender and where?

tested with a current version on both mac and linux 490da48 the behaviour is in fact slightly different, in linux it is rolling further than in mac. So the initial 'odd behaviour' is now gone, but it is still slightly different in different platforms. This should not happen :) Don't worry about wasting time! It should just be consistent across all supported platforms. @scorpion81 can you try to isolate the problem? With a simpler blend file, so I can try to understand if it is a problem in bullet or blender and where?

Inês Almeida commented

2014-07-18 13:29:02 +02:00

Here is a simpler file provided by scorpion81
The torus has different speeds depending on the OS

Here is a simpler file provided by scorpion81 The torus has different speeds depending on the OS

Inês Almeida self-assigned this 2014-07-18 13:34:09 +02:00

Inês Almeida removed their assignment 2014-08-23 20:13:46 +02:00

Aaron Carlisle commented

2019-06-29 02:20:34 +02:00

Added subscriber: @Blendify

Aaron Carlisle commented

2019-06-29 02:20:34 +02:00

Changed status from 'Open' to: 'Archived'

Aaron Carlisle closed this issue

2019-06-29 02:20:34 +02:00

Aaron Carlisle self-assigned this 2019-06-29 02:20:34 +02:00

Aaron Carlisle commented

2019-06-29 02:20:34 +02:00

This task is being closed because the BGE has been removed in Blender 2.8.

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Odd physics behavior in Blender Game Engine under Windows Only #32861