Blender Foundation: Blender 2.x BF release: Detail: 33168 Collada export from Blender 2.64a has incorrect material names

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[#33168] Collada export from Blender 2.64a has incorrect material names

Date:
2012-11-13 20:24 Priority:
3

State:
Closed

Submitted by:
Michael Bean (cannos) Assigned to:
Gaia Clary (gaiaclary)

Category:
Import/Export Status:
Fixed / Closed

Relates to: Duplicates:

Patches:

Summary:
Collada export from Blender 2.64a has incorrect material names

Detailed description

In Blender version 2.64a, the Collada exporter isn't exporting material names. It appears to be copying the material node ID name as the material name.

I have attached files that demonstrate the issue. There is a default cube with a material named "TestMatName[extra]".

If exported to Collada with 2.63, the material name is correct:
<material id="TestMatName_extra_-material" name="TestMatName[extra]">

If exported to Collada with 2.64, the material name is incorrect (the name matches the id):
<material id="TestMatName_extra_-material" name="TestMatName_extra_-material">

Exporting the correct material names are critical for tools that use naming conventions to specify material userdata.

Followup

Message

Date: 2012-11-27 21:54
Sender: Brecht Van Lommel
I agree the -material postfix should not be there. However I'm not sure [ and ] are valid tokens for names, sketchup seems to convert them to _ when saving, and preview refuses to open collada files with these tokens in names.

Date: 2012-11-27 22:27
Sender: Brecht Van Lommel
I meant characters rather than tokens of course.

Anyway, I found out that in Collada 1.4 the material name attribute is defined as "xs:NCName", which is not allowed to contain brackets. Collada 1.5 on the other hand has it defined as "xs:token" which can contain any character. We are still writing Collada 1.4 files currently, so writing the [ character would not be valid. The problem is that Collada 1.5 is not backwards compatible so switching to that is not a simple decision (and outside the scope of this bug report anyway).

I removed the -material postfix now in svn, but further we will only preserve these character according to the spec:
http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-NameChar

Date: 2012-11-28 00:06
Sender: Michael Bean
Okay, so I guess it was a bug in Blender 2.63 that it supported those special characters in the material name? Thanks.

Date: 2012-11-28 00:39
Sender: Brecht Van Lommel
Indeed, that was a bug which caused some applications to fail opening our collada files. I fear you'll have to find a different syntax to specify that material userdata.

Date: 2012-11-28 01:17
Sender: Michael Bean
Yeah, I'll figure out some other workaround, or continue to use 2.63 for a while. Are there any other plans to export material userdata to Collada? Collada does have some "extra" nodes in materials for this type of information.

Attached Files:

Name	Date	Download

matnametest264.dae	2012-11-13 20:24	Download
matnametest263.dae	2012-11-13 20:24	Download
matnametest.blend	2012-11-13 20:24	Download

Changes:

Field	Old Value	Date	By

status_id	Open	2012-11-27 22:27	blendix
close_date	None	2012-11-27 22:27	blendix
Status	Investigate	2012-11-27 22:27	blendix
assigned_to	none	2012-11-13 20:56	gaiaclary
Status	New	2012-11-13 20:56	gaiaclary
File Added	22752: matnametest.blend	2012-11-13 20:24	cannos
File Added	22753: matnametest263.dae	2012-11-13 20:24	cannos
File Added	22754: matnametest264.dae	2012-11-13 20:24	cannos