Double scaling for cylinder shape in .bullet export, cone shape not serialized #38474

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Alexander Filonov · 2014-02-04T08:43:22+01:00

Alexander Filonov commented

2014-02-04 08:43:22 +01:00

System Information
Windows 7 x64

Blender Version
Broken: 2.69.0 r60995

In blender, Scale and dimension of an object change simultaneously. I export the model with cylinder collision shape to the .bullet through the usual script:

import PhysicsConstraints
PhysicsConstraints.exportBulletFile("d:/myFile.bullet")

and then deserialize it to my application, based on bullet (bullet-2.82-r2704). During the import, the collision shape is imported with the given dimensions, and then scaling is applied, which results in squared shape dimensions - e.g. cylinder with scale 3.0 has dimension 23.0=6.0 in blender, but after importing corresponding .bullet file it becomes 23.0*3.0=18.0 in my app.
I tried this for box, sphere, convex hull and cone, all works ok for box, sphere and convex hull, cylinder has errors as mentioned above, and cone is not deserialized at all - there must be some binary structure misalignment.

blender scene:
blender file: scaling.blend
my application output: (the big base plane is not related to the original scene)

**System Information** Windows 7 x64 **Blender Version** Broken: 2.69.0 r60995 In blender, Scale and dimension of an object change simultaneously. I export the model with cylinder collision shape to the .bullet through the usual script: ``` import PhysicsConstraints PhysicsConstraints.exportBulletFile("d:/myFile.bullet") ``` and then deserialize it to my application, based on bullet (bullet-2.82-r2704). During the import, the collision shape is imported with the given dimensions, and then scaling is applied, which results in squared shape dimensions - e.g. cylinder with scale 3.0 has dimension 2*3.0=6.0 in blender, but after importing corresponding .bullet file it becomes 2*3.0*3.0=18.0 in my app. I tried this for box, sphere, convex hull and cone, all works ok for box, sphere and convex hull, cylinder has errors as mentioned above, and cone is not deserialized at all - there must be some binary structure misalignment. blender scene: ![scaling_blender.png](https://archive.blender.org/developer/F75940/scaling_blender.png) blender file: [scaling.blend](https://archive.blender.org/developer/F75942/scaling.blend) my application output: ![scaling.png](https://archive.blender.org/developer/F75938/scaling.png) (the big base plane is not related to the original scene)

Alexander Filonov commented

2014-02-04 08:43:22 +01:00

Changed status to: 'Open'

Alexander Filonov commented

2014-02-04 08:43:22 +01:00

Added subscriber: @kingsb

Inês Almeida commented

2014-06-19 21:04:30 +02:00

Added subscriber: @brita

Inês Almeida commented

2014-06-19 21:04:30 +02:00

@kingsb there were some changes affecting this recently, can you test again in with the 2.71 RC?

Inês Almeida commented

2014-06-27 20:48:35 +02:00

@kingsb I can not possibly test in useful time if this is working or not with your setup without your collaboration.

Alexander Filonov commented

2014-07-02 13:28:16 +02:00

@brita, Cone now deserialized perfectly. For cylinder deserialization to work, fixes to bullet code required - but this does not relates directly to blender. Scale and dimension of an object still change simultaneously - as I understand it's a choice of design, they are synonyms in blender, while in bullet they have slightly different meaning and can be changed independently.

@brita, Cone now deserialized perfectly. For cylinder deserialization to work, fixes to **`bullet`** code required - but this does not relates directly to blender. Scale and dimension of an object still change simultaneously - as I understand it's a choice of design, they are synonyms in blender, while in bullet they have slightly different meaning and can be changed independently.

Inês Almeida commented

2014-07-03 11:57:55 +02:00

@kingsb in blender you also have scale and dimension. If you scale an object, both will change, but you can then apply the scale meaning that it will be set to 1 while keeping the dimensions.
This is no longer a problem then? I can close?

@kingsb in blender you also have scale and dimension. If you scale an object, both will change, but you can then apply the scale meaning that it will be set to 1 while keeping the dimensions. This is no longer a problem then? I can close?

Alexander Filonov commented

2014-07-03 13:02:09 +02:00

Sorry, I did not find the way to change the scale separately from dimensions. How to do that?

Alexander Filonov commented

2014-07-03 13:07:35 +02:00

Oh, I found it! Ctrl-a - so simple!
Yes, you can close.

Oh, I found it! Ctrl-a - so simple! Yes, you can close.

Inês Almeida commented

2014-07-03 19:30:20 +02:00

Changed status from 'Open' to: 'Resolved'

Inês Almeida closed this issue

2014-07-03 19:30:20 +02:00

Inês Almeida self-assigned this 2014-07-03 19:30:20 +02:00

Inês Almeida commented

2014-07-03 19:30:20 +02:00

I am glad you have a simple solution to your workflow :)
closing

I am glad you have a simple solution to your workflow :) closing

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Reference: blender/blender#38474

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Double scaling for cylinder shape in .bullet export, cone shape not serialized #38474