[Bf-committers] 1) ESC doesn't abort render 2) Bullet physicsproblems

Erwin Coumans erwin at erwincoumans.com
Sat May 13 02:07:15 CEST 2006


There is a lot of ways to make physics not work, and you probably found one 
of them :)
Easiest is to look more at the provided samples that work, and see which 
change breaks things. Usually scaling messes things up badly.
Scaling, shifting the center of mass, making objects too small (there is 
hard coded tolerances at the moment) etc.

Best is to mail me a blend, and I can verify it.

Eventually some faq should help out.
Havok and PhysX/Novodex have hundreds of pages to explain how to avoid 
making a mess of it :)


----- Original Message ----- 
From: "Alexander Ewering" <blender at instinctive.de>
To: <bf-committers at blender.org>
Sent: Friday, May 12, 2006 4:53 PM
Subject: [Bf-committers] 1) ESC doesn't abort render 2) Bullet 

> Hi,
> 1) ESC
> is this just me, or did really noone bother to make ESC work for aborting 
> a
> render?
> When I press ESC during rendering, nothing happens - I have to hard-kill
> Blender.
> 2) Bullet
> I can't get very useful results when using Bullet, though the demo files
> (esp. the "lots of bricks on a heap" file) seem to work fine.
> Example: I add a plane, extrude it to give it depth, calc normals outside.
> Then, I add a cube, squeeze it to be a brick, scale it down to about 0.2
> blender units (I assume 1 BU is still = 1 metre in Bullet?), and then set 
> it
> to Actor, Rigid Body, Bounds -> Box. Depending on the "Form Factor" 
> setting
> and the height of the brick above the floor, any of the following can
> happen:
> 1) The brick falls right through the floor
> 2) The brick rotates nervously on the floor for a fraction of a second
>    and THEN falls through the floor
> 3) The brick stops 10 cm *above* the floor, jitters around like a bar of
>    soap and eventually stops abruptly.
> What am I missing?
> | alexander ewering              instinctive mediaworks
> | ae[@]instinctive[.]de   http://www[.]instinctive[.]de
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